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| author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
|---|---|---|
| committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
| commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
| tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /INSTALL/specific.html | |
| download | cbb-gcc-4.6.4-554fd8c5195424bdbcabf5de30fdc183aba391bd.tar.bz2 cbb-gcc-4.6.4-554fd8c5195424bdbcabf5de30fdc183aba391bd.tar.xz | |
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diff --git a/INSTALL/specific.html b/INSTALL/specific.html new file mode 100644 index 000000000..11c9bccdd --- /dev/null +++ b/INSTALL/specific.html @@ -0,0 +1,1561 @@ +<html lang="en"> +<head> +<title>Host/Target specific installation notes for GCC</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="Host/Target specific installation notes for GCC"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="top" href="#Top"> +<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> +<!-- +Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, +1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, +2010 Free Software Foundation, Inc. + + Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with no +Invariant Sections, the Front-Cover texts being (a) (see below), and +with the Back-Cover Texts being (b) (see below). A copy of the +license is included in the section entitled "GNU Free Documentation License". + +(a) The FSF's Front-Cover Text is: + + A GNU Manual + +(b) The FSF's Back-Cover Text is: + + You have freedom to copy and modify this GNU Manual, like GNU + software. Copies published by the Free Software Foundation raise + funds for GNU development.--> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<h1 class="settitle">Host/Target specific installation notes for GCC</h1> +<a name="index-Specific-1"></a><a name="index-Specific-installation-notes-2"></a><a name="index-Target-specific-installation-3"></a><a name="index-Host-specific-installation-4"></a><a name="index-Target-specific-installation-notes-5"></a> +Please read this document carefully <em>before</em> installing the +GNU Compiler Collection on your machine. + + <p>Note that this list of install notes is <em>not</em> a list of supported +hosts or targets. Not all supported hosts and targets are listed +here, only the ones that require host-specific or target-specific +information are. + + <ul> +<li><a href="#alpha-x-x">alpha*-*-*</a> +<li><a href="#alpha-dec-osf51">alpha*-dec-osf5.1</a> +<li><a href="#arc-x-elf">arc-*-elf</a> +<li><a href="#arm-x-elf">arm-*-elf</a> +<li><a href="#avr">avr</a> +<li><a href="#bfin">Blackfin</a> +<li><a href="#dos">DOS</a> +<li><a href="#x-x-freebsd">*-*-freebsd*</a> +<li><a href="#h8300-hms">h8300-hms</a> +<li><a href="#hppa-hp-hpux">hppa*-hp-hpux*</a> +<li><a href="#hppa-hp-hpux10">hppa*-hp-hpux10</a> +<li><a href="#hppa-hp-hpux11">hppa*-hp-hpux11</a> +<li><a href="#x-x-linux-gnu">*-*-linux-gnu</a> +<li><a href="#ix86-x-linux">i?86-*-linux*</a> +<li><a href="#ix86-x-solaris289">i?86-*-solaris2.[89]</a> +<li><a href="#ix86-x-solaris210">i?86-*-solaris2.10</a> +<li><a href="#ia64-x-linux">ia64-*-linux</a> +<li><a href="#ia64-x-hpux">ia64-*-hpux*</a> +<li><a href="#x-ibm-aix">*-ibm-aix*</a> +<li><a href="#iq2000-x-elf">iq2000-*-elf</a> +<li><a href="#lm32-x-elf">lm32-*-elf</a> +<li><a href="#lm32-x-uclinux">lm32-*-uclinux</a> +<li><a href="#m32c-x-elf">m32c-*-elf</a> +<li><a href="#m32r-x-elf">m32r-*-elf</a> +<li><a href="#m6811-elf">m6811-elf</a> +<li><a href="#m6812-elf">m6812-elf</a> +<li><a href="#m68k-x-x">m68k-*-*</a> +<li><a href="#m68k-uclinux">m68k-uclinux</a> +<li><a href="#mep-x-elf">mep-*-elf</a> +<li><a href="#microblaze-x-elf">microblaze-*-elf</a> +<li><a href="#mips-x-x">mips-*-*</a> +<li><a href="#mips-sgi-irix5">mips-sgi-irix5</a> +<li><a href="#mips-sgi-irix6">mips-sgi-irix6</a> +<li><a href="#powerpc-x-x">powerpc*-*-*</a> +<li><a href="#powerpc-x-darwin">powerpc-*-darwin*</a> +<li><a href="#powerpc-x-elf">powerpc-*-elf</a> +<li><a href="#powerpc-x-linux-gnu">powerpc*-*-linux-gnu*</a> +<li><a href="#powerpc-x-netbsd">powerpc-*-netbsd*</a> +<li><a href="#powerpc-x-eabisim">powerpc-*-eabisim</a> +<li><a href="#powerpc-x-eabi">powerpc-*-eabi</a> +<li><a href="#powerpcle-x-elf">powerpcle-*-elf</a> +<li><a href="#powerpcle-x-eabisim">powerpcle-*-eabisim</a> +<li><a href="#powerpcle-x-eabi">powerpcle-*-eabi</a> +<li><a href="#s390-x-linux">s390-*-linux*</a> +<li><a href="#s390x-x-linux">s390x-*-linux*</a> +<li><a href="#s390x-ibm-tpf">s390x-ibm-tpf*</a> +<li><a href="#x-x-solaris2">*-*-solaris2*</a> +<li><a href="#sparc-x-x">sparc*-*-*</a> +<li><a href="#sparc-sun-solaris2">sparc-sun-solaris2*</a> +<li><a href="#sparc-sun-solaris210">sparc-sun-solaris2.10</a> +<li><a href="#sparc-x-linux">sparc-*-linux*</a> +<li><a href="#sparc64-x-solaris2">sparc64-*-solaris2*</a> +<li><a href="#sparcv9-x-solaris2">sparcv9-*-solaris2*</a> +<li><a href="#x-x-vxworks">*-*-vxworks*</a> +<li><a href="#x86-64-x-x">x86_64-*-*</a> amd64-*-* +<li><a href="#xtensa-x-elf">xtensa*-*-elf</a> +<li><a href="#xtensa-x-linux">xtensa*-*-linux*</a> +<li><a href="#windows">Microsoft Windows</a> +<li><a href="#x-x-cygwin">*-*-cygwin</a> +<li><a href="#x-x-interix">*-*-interix</a> +<li><a href="#x-x-mingw32">*-*-mingw32</a> +<li><a href="#os2">OS/2</a> +<li><a href="#older">Older systems</a> +</ul> + + <ul> +<li><a href="#elf">all ELF targets</a> (SVR4, Solaris 2, etc.) +</ul> + + <p><!-- -------- host/target specific issues start here ---------------- --> +<hr /> + +<h3 class="heading"><a name="TOC0"></a><a name="alpha_002dx_002dx"></a>alpha*-*-*</h3> + +<p>This section contains general configuration information for all +alpha-based platforms using ELF (in particular, ignore this section for +DEC OSF/1, Digital UNIX and Tru64 UNIX). In addition to reading this +section, please read all other sections that match your target. + + <p>We require binutils 2.11.2 or newer. +Previous binutils releases had a number of problems with DWARF 2 +debugging information, not the least of which is incorrect linking of +shared libraries. + + <p><hr /> + +<h3 class="heading"><a name="TOC1"></a><a name="alpha_002ddec_002dosf51"></a>alpha*-dec-osf5.1</h3> + +<p>Systems using processors that implement the DEC Alpha architecture and +are running the DEC/Compaq/HP Unix (DEC OSF/1, Digital UNIX, or Compaq/HP +Tru64 UNIX) operating system, for example the DEC Alpha AXP systems. + + <p>As of GCC 3.2, versions before <code>alpha*-dec-osf4</code> are no longer +supported. (These are the versions which identify themselves as DEC +OSF/1.) As of GCC 4.6, support for Tru64 UNIX V4.0 and V5.0 has been +removed. + + <p>On Tru64 UNIX, virtual memory exhausted bootstrap failures +may be fixed by reconfiguring Kernel Virtual Memory and Swap parameters +per the <samp><span class="command">/usr/sbin/sys_check</span></samp> Tuning Suggestions, +or applying the patch in +<a href="http://gcc.gnu.org/ml/gcc/2002-08/msg00822.html">http://gcc.gnu.org/ml/gcc/2002-08/msg00822.html</a>. Depending on +the OS version used, you need a data segment size between 512 MB and +1 GB, so simply use <samp><span class="command">ulimit -Sd unlimited</span></samp>. + + <p>As of GNU binutils 2.21, neither GNU <samp><span class="command">as</span></samp> nor GNU <samp><span class="command">ld</span></samp> +are supported on Tru64 UNIX, so you must not configure GCC with +<samp><span class="option">--with-gnu-as</span></samp> or <samp><span class="option">--with-gnu-ld</span></samp>. + + <p>GCC writes a ‘<samp><span class="samp">.verstamp</span></samp>’ directive to the assembler output file +unless it is built as a cross-compiler. It gets the version to use from +the system header file <samp><span class="file">/usr/include/stamp.h</span></samp>. If you install a +new version of Tru64 UNIX, you should rebuild GCC to pick up the new version +stamp. + + <p>GCC now supports both the native (ECOFF) debugging format used by DBX +and GDB and an encapsulated STABS format for use only with GDB. See the +discussion of the <samp><span class="option">--with-stabs</span></samp> option of <samp><span class="file">configure</span></samp> above +for more information on these formats and how to select them. +<!-- FIXME: does this work at all? If so, perhaps make default. --> + + <p>There is a bug in DEC's assembler that produces incorrect line numbers +for ECOFF format when the ‘<samp><span class="samp">.align</span></samp>’ directive is used. To work +around this problem, GCC will not emit such alignment directives +while writing ECOFF format debugging information even if optimization is +being performed. Unfortunately, this has the very undesirable +side-effect that code addresses when <samp><span class="option">-O</span></samp> is specified are +different depending on whether or not <samp><span class="option">-g</span></samp> is also specified. + + <p>To avoid this behavior, specify <samp><span class="option">-gstabs+</span></samp> and use GDB instead of +DBX. DEC is now aware of this problem with the assembler and hopes to +provide a fix shortly. + +<!-- FIXME: still applicable? --> + <p><hr /> + +<h3 class="heading"><a name="TOC2"></a><a name="arc_002dx_002delf"></a>arc-*-elf</h3> + +<p>Argonaut ARC processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC3"></a><a name="arm_002dx_002delf"></a>arm-*-elf</h3> + +<p>ARM-family processors. Subtargets that use the ELF object format +require GNU binutils 2.13 or newer. Such subtargets include: +<code>arm-*-freebsd</code>, <code>arm-*-netbsdelf</code>, <code>arm-*-*linux</code> +and <code>arm-*-rtems</code>. + + <p><hr /> + +<h3 class="heading"><a name="TOC4"></a><a name="avr"></a>avr</h3> + +<p>ATMEL AVR-family micro controllers. These are used in embedded +applications. There are no standard Unix configurations. +See “AVR Options” in the main manual +for the list of supported MCU types. + + <p>Use ‘<samp><span class="samp">configure --target=avr --enable-languages="c"</span></samp>’ to configure GCC. + + <p>Further installation notes and other useful information about AVR tools +can also be obtained from: + + <ul> +<li><a href="http://www.nongnu.org/avr/">http://www.nongnu.org/avr/</a> +<li><a href="http://www.amelek.gda.pl/avr/">http://www.amelek.gda.pl/avr/</a> +</ul> + + <p>We <em>strongly</em> recommend using binutils 2.13 or newer. + + <p>The following error: +<pre class="smallexample"> Error: register required +</pre> + <p>indicates that you should upgrade to a newer version of the binutils. + + <p><hr /> + +<h3 class="heading"><a name="TOC5"></a><a name="bfin"></a>Blackfin</h3> + +<p>The Blackfin processor, an Analog Devices DSP. +See “Blackfin Options” in the main manual + + <p>More information, and a version of binutils with support for this processor, +is available at <a href="http://blackfin.uclinux.org">http://blackfin.uclinux.org</a> + + <p><hr /> + +<h3 class="heading"><a name="TOC6"></a><a name="cris"></a>CRIS</h3> + +<p>CRIS is the CPU architecture in Axis Communications ETRAX system-on-a-chip +series. These are used in embedded applications. + + <p>See “CRIS Options” in the main manual +for a list of CRIS-specific options. + + <p>There are a few different CRIS targets: + <dl> +<dt><code>cris-axis-elf</code><dd>Mainly for monolithic embedded systems. Includes a multilib for the +‘<samp><span class="samp">v10</span></samp>’ core used in ‘<samp><span class="samp">ETRAX 100 LX</span></samp>’. +<br><dt><code>cris-axis-linux-gnu</code><dd>A GNU/Linux port for the CRIS architecture, currently targeting +‘<samp><span class="samp">ETRAX 100 LX</span></samp>’ by default. +</dl> + + <p>For <code>cris-axis-elf</code> you need binutils 2.11 +or newer. For <code>cris-axis-linux-gnu</code> you need binutils 2.12 or newer. + + <p>Pre-packaged tools can be obtained from +<a href="ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/">ftp://ftp.axis.com/pub/axis/tools/cris/compiler-kit/</a>. More +information about this platform is available at +<a href="http://developer.axis.com/">http://developer.axis.com/</a>. + + <p><hr /> + +<h3 class="heading"><a name="TOC7"></a><a name="crx"></a>CRX</h3> + +<p>The CRX CompactRISC architecture is a low-power 32-bit architecture with +fast context switching and architectural extensibility features. + + <p>See “CRX Options” in the main manual for a list of CRX-specific options. + + <p>Use ‘<samp><span class="samp">configure --target=crx-elf --enable-languages=c,c++</span></samp>’ to configure +GCC for building a CRX cross-compiler. The option ‘<samp><span class="samp">--target=crx-elf</span></samp>’ +is also used to build the ‘<samp><span class="samp">newlib</span></samp>’ C library for CRX. + + <p>It is also possible to build libstdc++-v3 for the CRX architecture. This +needs to be done in a separate step with the following configure settings: + +<pre class="smallexample"> gcc/libstdc++-v3/configure --host=crx-elf --with-newlib \ + --enable-sjlj-exceptions --enable-cxx-flags='-fexceptions -frtti' +</pre> + <p><hr /> + +<h3 class="heading"><a name="TOC8"></a><a name="dos"></a>DOS</h3> + +<p>Please have a look at the <a href="binaries.html">binaries page</a>. + + <p>You cannot install GCC by itself on MSDOS; it will not compile under +any MSDOS compiler except itself. You need to get the complete +compilation package DJGPP, which includes binaries as well as sources, +and includes all the necessary compilation tools and libraries. + + <p><hr /> + +<h3 class="heading"><a name="TOC9"></a><a name="x_002dx_002dfreebsd"></a>*-*-freebsd*</h3> + +<p>Support for FreeBSD 1 was discontinued in GCC 3.2. Support for +FreeBSD 2 (and any mutant a.out variants of FreeBSD 3) was +discontinued in GCC 4.0. + + <p>In order to better utilize FreeBSD base system functionality and match +the configuration of the system compiler, GCC 4.5 and above as well as +GCC 4.4 past 2010-06-20 leverage SSP support in libc (which is present +on FreeBSD 7 or later) and the use of <code>__cxa_atexit</code> by default +(on FreeBSD 6 or later). The use of <code>dl_iterate_phdr</code> inside +<samp><span class="file">libgcc_s.so.1</span></samp> and boehm-gc (on FreeBSD 7 or later) is enabled +by GCC 4.5 and above. + + <p>We support FreeBSD using the ELF file format with DWARF 2 debugging +for all CPU architectures. You may use <samp><span class="option">-gstabs</span></samp> instead of +<samp><span class="option">-g</span></samp>, if you really want the old debugging format. There are +no known issues with mixing object files and libraries with different +debugging formats. Otherwise, this release of GCC should now match +more of the configuration used in the stock FreeBSD configuration of +GCC. In particular, <samp><span class="option">--enable-threads</span></samp> is now configured by +default. However, as a general user, do not attempt to replace the +system compiler with this release. Known to bootstrap and check with +good results on FreeBSD 7.2-STABLE. In the past, known to bootstrap +and check with good results on FreeBSD 3.0, 3.4, 4.0, 4.2, 4.3, 4.4, +4.5, 4.8, 4.9 and 5-CURRENT. + + <p>The version of binutils installed in <samp><span class="file">/usr/bin</span></samp> probably works +with this release of GCC. Bootstrapping against the latest GNU +binutils and/or the version found in <samp><span class="file">/usr/ports/devel/binutils</span></samp> has +been known to enable additional features and improve overall testsuite +results. However, it is currently known that boehm-gc (which itself +is required for java) may not configure properly on FreeBSD prior to +the FreeBSD 7.0 release with GNU binutils after 2.16.1. + + <p><hr /> + +<h3 class="heading"><a name="TOC10"></a><a name="h8300_002dhms"></a>h8300-hms</h3> + +<p>Renesas H8/300 series of processors. + + <p>Please have a look at the <a href="binaries.html">binaries page</a>. + + <p>The calling convention and structure layout has changed in release 2.6. +All code must be recompiled. The calling convention now passes the +first three arguments in function calls in registers. Structures are no +longer a multiple of 2 bytes. + + <p><hr /> + +<h3 class="heading"><a name="TOC11"></a><a name="hppa_002dhp_002dhpux"></a>hppa*-hp-hpux*</h3> + +<p>Support for HP-UX version 9 and older was discontinued in GCC 3.4. + + <p>We require using gas/binutils on all hppa platforms. Version 2.19 or +later is recommended. + + <p>It may be helpful to configure GCC with the +<a href="./configure.html#with-gnu-as"><samp><span class="option">--with-gnu-as</span></samp></a> and +<samp><span class="option">--with-as=...</span></samp> options to ensure that GCC can find GAS. + + <p>The HP assembler should not be used with GCC. It is rarely tested and may +not work. It shouldn't be used with any languages other than C due to its +many limitations. + + <p>Specifically, <samp><span class="option">-g</span></samp> does not work (HP-UX uses a peculiar debugging +format which GCC does not know about). It also inserts timestamps +into each object file it creates, causing the 3-stage comparison test to +fail during a bootstrap. You should be able to continue by saying +‘<samp><span class="samp">make all-host all-target</span></samp>’ after getting the failure from ‘<samp><span class="samp">make</span></samp>’. + + <p>Various GCC features are not supported. For example, it does not support weak +symbols or alias definitions. As a result, explicit template instantiations +are required when using C++. This makes it difficult if not impossible to +build many C++ applications. + + <p>There are two default scheduling models for instructions. These are +PROCESSOR_7100LC and PROCESSOR_8000. They are selected from the pa-risc +architecture specified for the target machine when configuring. +PROCESSOR_8000 is the default. PROCESSOR_7100LC is selected when +the target is a ‘<samp><span class="samp">hppa1*</span></samp>’ machine. + + <p>The PROCESSOR_8000 model is not well suited to older processors. Thus, +it is important to completely specify the machine architecture when +configuring if you want a model other than PROCESSOR_8000. The macro +TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different +default scheduling model is desired. + + <p>As of GCC 4.0, GCC uses the UNIX 95 namespace for HP-UX 10.10 +through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later. +This namespace change might cause problems when bootstrapping with +an earlier version of GCC or the HP compiler as essentially the same +namespace is required for an entire build. This problem can be avoided +in a number of ways. With HP cc, <samp><span class="env">UNIX_STD</span></samp> can be set to ‘<samp><span class="samp">95</span></samp>’ +or ‘<samp><span class="samp">98</span></samp>’. Another way is to add an appropriate set of predefines +to <samp><span class="env">CC</span></samp>. The description for the <samp><span class="option">munix=</span></samp> option contains +a list of the predefines used with each standard. + + <p>More specific information to ‘<samp><span class="samp">hppa*-hp-hpux*</span></samp>’ targets follows. + + <p><hr /> + +<h3 class="heading"><a name="TOC12"></a><a name="hppa_002dhp_002dhpux10"></a>hppa*-hp-hpux10</h3> + +<p>For hpux10.20, we <em>highly</em> recommend you pick up the latest sed patch +<code>PHCO_19798</code> from HP. + + <p>The C++ ABI has changed incompatibly in GCC 4.0. COMDAT subspaces are +used for one-only code and data. This resolves many of the previous +problems in using C++ on this target. However, the ABI is not compatible +with the one implemented under HP-UX 11 using secondary definitions. + + <p><hr /> + +<h3 class="heading"><a name="TOC13"></a><a name="hppa_002dhp_002dhpux11"></a>hppa*-hp-hpux11</h3> + +<p>GCC 3.0 and up support HP-UX 11. GCC 2.95.x is not supported and cannot +be used to compile GCC 3.0 and up. + + <p>The libffi and libjava libraries haven't been ported to 64-bit HP-UX and don't build. + + <p>Refer to <a href="binaries.html">binaries</a> for information about obtaining +precompiled GCC binaries for HP-UX. Precompiled binaries must be obtained +to build the Ada language as it can't be bootstrapped using C. Ada is +only available for the 32-bit PA-RISC runtime. + + <p>Starting with GCC 3.4 an ISO C compiler is required to bootstrap. The +bundled compiler supports only traditional C; you will need either HP's +unbundled compiler, or a binary distribution of GCC. + + <p>It is possible to build GCC 3.3 starting with the bundled HP compiler, +but the process requires several steps. GCC 3.3 can then be used to +build later versions. The fastjar program contains ISO C code and +can't be built with the HP bundled compiler. This problem can be +avoided by not building the Java language. For example, use the +<samp><span class="option">--enable-languages="c,c++,f77,objc"</span></samp> option in your configure +command. + + <p>There are several possible approaches to building the distribution. +Binutils can be built first using the HP tools. Then, the GCC +distribution can be built. The second approach is to build GCC +first using the HP tools, then build binutils, then rebuild GCC. +There have been problems with various binary distributions, so it +is best not to start from a binary distribution. + + <p>On 64-bit capable systems, there are two distinct targets. Different +installation prefixes must be used if both are to be installed on +the same system. The ‘<samp><span class="samp">hppa[1-2]*-hp-hpux11*</span></samp>’ target generates code +for the 32-bit PA-RISC runtime architecture and uses the HP linker. +The ‘<samp><span class="samp">hppa64-hp-hpux11*</span></samp>’ target generates 64-bit code for the +PA-RISC 2.0 architecture. + + <p>The script config.guess now selects the target type based on the compiler +detected during configuration. You must define <samp><span class="env">PATH</span></samp> or <samp><span class="env">CC</span></samp> so +that configure finds an appropriate compiler for the initial bootstrap. +When <samp><span class="env">CC</span></samp> is used, the definition should contain the options that are +needed whenever <samp><span class="env">CC</span></samp> is used. + + <p>Specifically, options that determine the runtime architecture must be +in <samp><span class="env">CC</span></samp> to correctly select the target for the build. It is also +convenient to place many other compiler options in <samp><span class="env">CC</span></samp>. For example, +<samp><span class="env">CC="cc -Ac +DA2.0W -Wp,-H16376 -D_CLASSIC_TYPES -D_HPUX_SOURCE"</span></samp> +can be used to bootstrap the GCC 3.3 branch with the HP compiler in +64-bit K&R/bundled mode. The <samp><span class="option">+DA2.0W</span></samp> option will result in +the automatic selection of the ‘<samp><span class="samp">hppa64-hp-hpux11*</span></samp>’ target. The +macro definition table of cpp needs to be increased for a successful +build with the HP compiler. _CLASSIC_TYPES and _HPUX_SOURCE need to +be defined when building with the bundled compiler, or when using the +<samp><span class="option">-Ac</span></samp> option. These defines aren't necessary with <samp><span class="option">-Ae</span></samp>. + + <p>It is best to explicitly configure the ‘<samp><span class="samp">hppa64-hp-hpux11*</span></samp>’ target +with the <samp><span class="option">--with-ld=...</span></samp> option. This overrides the standard +search for ld. The two linkers supported on this target require different +commands. The default linker is determined during configuration. As a +result, it's not possible to switch linkers in the middle of a GCC build. +This has been reported to sometimes occur in unified builds of binutils +and GCC. + + <p>A recent linker patch must be installed for the correct operation of +GCC 3.3 and later. <code>PHSS_26559</code> and <code>PHSS_24304</code> are the +oldest linker patches that are known to work. They are for HP-UX +11.00 and 11.11, respectively. <code>PHSS_24303</code>, the companion to +<code>PHSS_24304</code>, might be usable but it hasn't been tested. These +patches have been superseded. Consult the HP patch database to obtain +the currently recommended linker patch for your system. + + <p>The patches are necessary for the support of weak symbols on the +32-bit port, and for the running of initializers and finalizers. Weak +symbols are implemented using SOM secondary definition symbols. Prior +to HP-UX 11, there are bugs in the linker support for secondary symbols. +The patches correct a problem of linker core dumps creating shared +libraries containing secondary symbols, as well as various other +linking issues involving secondary symbols. + + <p>GCC 3.3 uses the ELF DT_INIT_ARRAY and DT_FINI_ARRAY capabilities to +run initializers and finalizers on the 64-bit port. The 32-bit port +uses the linker <samp><span class="option">+init</span></samp> and <samp><span class="option">+fini</span></samp> options for the same +purpose. The patches correct various problems with the +init/+fini +options, including program core dumps. Binutils 2.14 corrects a +problem on the 64-bit port resulting from HP's non-standard use of +the .init and .fini sections for array initializers and finalizers. + + <p>Although the HP and GNU linkers are both supported for the +‘<samp><span class="samp">hppa64-hp-hpux11*</span></samp>’ target, it is strongly recommended that the +HP linker be used for link editing on this target. + + <p>At this time, the GNU linker does not support the creation of long +branch stubs. As a result, it can't successfully link binaries +containing branch offsets larger than 8 megabytes. In addition, +there are problems linking shared libraries, linking executables +with <samp><span class="option">-static</span></samp>, and with dwarf2 unwind and exception support. +It also doesn't provide stubs for internal calls to global functions +in shared libraries, so these calls can't be overloaded. + + <p>The HP dynamic loader does not support GNU symbol versioning, so symbol +versioning is not supported. It may be necessary to disable symbol +versioning with <samp><span class="option">--disable-symvers</span></samp> when using GNU ld. + + <p>POSIX threads are the default. The optional DCE thread library is not +supported, so <samp><span class="option">--enable-threads=dce</span></samp> does not work. + + <p><hr /> + +<h3 class="heading"><a name="TOC14"></a><a name="x_002dx_002dlinux_002dgnu"></a>*-*-linux-gnu</h3> + +<p>Versions of libstdc++-v3 starting with 3.2.1 require bug fixes present +in glibc 2.2.5 and later. More information is available in the +libstdc++-v3 documentation. + + <p><hr /> + +<h3 class="heading"><a name="TOC15"></a><a name="ix86_002dx_002dlinux"></a>i?86-*-linux*</h3> + +<p>As of GCC 3.3, binutils 2.13.1 or later is required for this platform. +See <a href="http://gcc.gnu.org/PR10877">bug 10877</a> for more information. + + <p>If you receive Signal 11 errors when building on GNU/Linux, then it is +possible you have a hardware problem. Further information on this can be +found on <a href="http://www.bitwizard.nl/sig11/">www.bitwizard.nl</a>. + + <p><hr /> + +<h3 class="heading"><a name="TOC16"></a><a name="ix86_002dx_002dsolaris289"></a>i?86-*-solaris2.[89]</h3> + +<p>The Sun assembler in Solaris 8 and 9 has several bugs and limitations. +While GCC works around them, several features are missing, so it is +<!-- FIXME: which ones? --> +recommended to use the GNU assembler instead. There is no bundled +version, but the current version, from GNU binutils 2.21, is known to +work. + + <p>Solaris 2/x86 doesn't support the execution of SSE/SSE2 instructions +before Solaris 9 4/04, even if the CPU supports them. Programs will +receive <code>SIGILL</code> if they try. The fix is available both in +Solaris 9 Update 6 and kernel patch 112234-12 or newer. There is no +corresponding patch for Solaris 8. To avoid this problem, +<samp><span class="option">-march</span></samp> defaults to ‘<samp><span class="samp">pentiumpro</span></samp>’ on Solaris 8 and 9. If +you have the patch installed, you can configure GCC with an appropriate +<samp><span class="option">--with-arch</span></samp> option, but need GNU <samp><span class="command">as</span></samp> for SSE2 support. + + <p><hr /> + +<h3 class="heading"><a name="TOC17"></a><a name="ix86_002dx_002dsolaris210"></a>i?86-*-solaris2.10</h3> + +<p>Use this for Solaris 10 or later on x86 and x86-64 systems. This +configuration is supported by GCC 4.0 and later versions only. Unlike +‘<samp><span class="samp">sparcv9-sun-solaris2*</span></samp>’, there is no corresponding 64-bit +configuration like ‘<samp><span class="samp">amd64-*-solaris2*</span></samp>’ or ‘<samp><span class="samp">x86_64-*-solaris2*</span></samp>’. +<!-- FIXME: will there ever be? --> + + <p>It is recommended that you configure GCC to use the GNU assembler, in +<samp><span class="file">/usr/sfw/bin/gas</span></samp>. The versions included in Solaris 10, from GNU +binutils 2.15, and Solaris 11, from GNU binutils 2.19, work fine, +although the current version, from GNU binutils +2.21, is known to work, too. Recent versions of the Sun assembler in +<samp><span class="file">/usr/ccs/bin/as</span></samp> work almost as well, though. +<!-- FIXME: as patch requirements? --> + + <p>For linking, the Sun linker, is preferred. If you want to use the GNU +linker instead, which is available in <samp><span class="file">/usr/sfw/bin/gld</span></samp>, note that +due to a packaging bug the version in Solaris 10, from GNU binutils +2.15, cannot be used, while the version in Solaris 11, from GNU binutils +2.19, works, as does the latest version, from GNU binutils 2.21. + + <p>To use GNU <samp><span class="command">as</span></samp>, configure with the options +<samp><span class="option">--with-gnu-as --with-as=/usr/sfw/bin/gas</span></samp>. It may be necessary +to configure with <samp><span class="option">--without-gnu-ld --with-ld=/usr/ccs/bin/ld</span></samp> to +guarantee use of Sun <samp><span class="command">ld</span></samp>. +<!-- FIXME: why -without-gnu-ld -with-ld? --> + + <p><hr /> + +<h3 class="heading"><a name="TOC18"></a><a name="ia64_002dx_002dlinux"></a>ia64-*-linux</h3> + +<p>IA-64 processor (also known as IPF, or Itanium Processor Family) +running GNU/Linux. + + <p>If you are using the installed system libunwind library with +<samp><span class="option">--with-system-libunwind</span></samp>, then you must use libunwind 0.98 or +later. + + <p>None of the following versions of GCC has an ABI that is compatible +with any of the other versions in this list, with the exception that +Red Hat 2.96 and Trillian 000171 are compatible with each other: +3.1, 3.0.2, 3.0.1, 3.0, Red Hat 2.96, and Trillian 000717. +This primarily affects C++ programs and programs that create shared libraries. +GCC 3.1 or later is recommended for compiling linux, the kernel. +As of version 3.1 GCC is believed to be fully ABI compliant, and hence no +more major ABI changes are expected. + + <p><hr /> + +<h3 class="heading"><a name="TOC19"></a><a name="ia64_002dx_002dhpux"></a>ia64-*-hpux*</h3> + +<p>Building GCC on this target requires the GNU Assembler. The bundled HP +assembler will not work. To prevent GCC from using the wrong assembler, +the option <samp><span class="option">--with-gnu-as</span></samp> may be necessary. + + <p>The GCC libunwind library has not been ported to HPUX. This means that for +GCC versions 3.2.3 and earlier, <samp><span class="option">--enable-libunwind-exceptions</span></samp> +is required to build GCC. For GCC 3.3 and later, this is the default. +For gcc 3.4.3 and later, <samp><span class="option">--enable-libunwind-exceptions</span></samp> is +removed and the system libunwind library will always be used. + + <p><hr /> +<!-- rs6000-ibm-aix*, powerpc-ibm-aix* --> + +<h3 class="heading"><a name="TOC20"></a><a name="x_002dibm_002daix"></a>*-ibm-aix*</h3> + +<p>Support for AIX version 3 and older was discontinued in GCC 3.4. +Support for AIX version 4.2 and older was discontinued in GCC 4.5. + + <p>“out of memory” bootstrap failures may indicate a problem with +process resource limits (ulimit). Hard limits are configured in the +<samp><span class="file">/etc/security/limits</span></samp> system configuration file. + + <p>GCC can bootstrap with recent versions of IBM XLC, but bootstrapping +with an earlier release of GCC is recommended. Bootstrapping with XLC +requires a larger data segment, which can be enabled through the +<var>LDR_CNTRL</var> environment variable, e.g., + +<pre class="smallexample"> % LDR_CNTRL=MAXDATA=0x50000000 + % export LDR_CNTRL +</pre> + <p>One can start with a pre-compiled version of GCC to build from +sources. One may delete GCC's “fixed” header files when starting +with a version of GCC built for an earlier release of AIX. + + <p>To speed up the configuration phases of bootstrapping and installing GCC, +one may use GNU Bash instead of AIX <samp><span class="command">/bin/sh</span></samp>, e.g., + +<pre class="smallexample"> % CONFIG_SHELL=/opt/freeware/bin/bash + % export CONFIG_SHELL +</pre> + <p>and then proceed as described in <a href="build.html">the build instructions</a>, where we strongly recommend specifying an absolute path +to invoke <var>srcdir</var>/configure. + + <p>Because GCC on AIX is built as a 32-bit executable by default, +(although it can generate 64-bit programs) the GMP and MPFR libraries +required by gfortran must be 32-bit libraries. Building GMP and MPFR +as static archive libraries works better than shared libraries. + + <p>Errors involving <code>alloca</code> when building GCC generally are due +to an incorrect definition of <code>CC</code> in the Makefile or mixing files +compiled with the native C compiler and GCC. During the stage1 phase of +the build, the native AIX compiler <strong>must</strong> be invoked as <samp><span class="command">cc</span></samp> +(not <samp><span class="command">xlc</span></samp>). Once <samp><span class="command">configure</span></samp> has been informed of +<samp><span class="command">xlc</span></samp>, one needs to use ‘<samp><span class="samp">make distclean</span></samp>’ to remove the +configure cache files and ensure that <samp><span class="env">CC</span></samp> environment variable +does not provide a definition that will confuse <samp><span class="command">configure</span></samp>. +If this error occurs during stage2 or later, then the problem most likely +is the version of Make (see above). + + <p>The native <samp><span class="command">as</span></samp> and <samp><span class="command">ld</span></samp> are recommended for bootstrapping +on AIX. The GNU Assembler, GNU Linker, and GNU Binutils version 2.20 +is required to bootstrap on AIX 5. The native AIX tools do +interoperate with GCC. + + <p>Building <samp><span class="file">libstdc++.a</span></samp> requires a fix for an AIX Assembler bug +APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1). It also requires a +fix for another AIX Assembler bug and a co-dependent AIX Archiver fix +referenced as APAR IY53606 (AIX 5.2) or as APAR IY54774 (AIX 5.1) + + <p>‘<samp><span class="samp">libstdc++</span></samp>’ in GCC 3.4 increments the major version number of the +shared object and GCC installation places the <samp><span class="file">libstdc++.a</span></samp> +shared library in a common location which will overwrite the and GCC +3.3 version of the shared library. Applications either need to be +re-linked against the new shared library or the GCC 3.1 and GCC 3.3 +versions of the ‘<samp><span class="samp">libstdc++</span></samp>’ shared object needs to be available +to the AIX runtime loader. The GCC 3.1 ‘<samp><span class="samp">libstdc++.so.4</span></samp>’, if +present, and GCC 3.3 ‘<samp><span class="samp">libstdc++.so.5</span></samp>’ shared objects can be +installed for runtime dynamic loading using the following steps to set +the ‘<samp><span class="samp">F_LOADONLY</span></samp>’ flag in the shared object for <em>each</em> +multilib <samp><span class="file">libstdc++.a</span></samp> installed: + + <p>Extract the shared objects from the currently installed +<samp><span class="file">libstdc++.a</span></samp> archive: +<pre class="smallexample"> % ar -x libstdc++.a libstdc++.so.4 libstdc++.so.5 +</pre> + <p>Enable the ‘<samp><span class="samp">F_LOADONLY</span></samp>’ flag so that the shared object will be +available for runtime dynamic loading, but not linking: +<pre class="smallexample"> % strip -e libstdc++.so.4 libstdc++.so.5 +</pre> + <p>Archive the runtime-only shared object in the GCC 3.4 +<samp><span class="file">libstdc++.a</span></samp> archive: +<pre class="smallexample"> % ar -q libstdc++.a libstdc++.so.4 libstdc++.so.5 +</pre> + <p>Linking executables and shared libraries may produce warnings of +duplicate symbols. The assembly files generated by GCC for AIX always +have included multiple symbol definitions for certain global variable +and function declarations in the original program. The warnings should +not prevent the linker from producing a correct library or runnable +executable. + + <p>AIX 4.3 utilizes a “large format” archive to support both 32-bit and +64-bit object modules. The routines provided in AIX 4.3.0 and AIX 4.3.1 +to parse archive libraries did not handle the new format correctly. +These routines are used by GCC and result in error messages during +linking such as “not a COFF file”. The version of the routines shipped +with AIX 4.3.1 should work for a 32-bit environment. The <samp><span class="option">-g</span></samp> +option of the archive command may be used to create archives of 32-bit +objects using the original “small format”. A correct version of the +routines is shipped with AIX 4.3.2 and above. + + <p>Some versions of the AIX binder (linker) can fail with a relocation +overflow severe error when the <samp><span class="option">-bbigtoc</span></samp> option is used to link +GCC-produced object files into an executable that overflows the TOC. A fix +for APAR IX75823 (OVERFLOW DURING LINK WHEN USING GCC AND -BBIGTOC) is +available from IBM Customer Support and from its +<a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a> +website as PTF U455193. + + <p>The AIX 4.3.2.1 linker (bos.rte.bind_cmds Level 4.3.2.1) will dump core +with a segmentation fault when invoked by any version of GCC. A fix for +APAR IX87327 is available from IBM Customer Support and from its +<a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a> +website as PTF U461879. This fix is incorporated in AIX 4.3.3 and above. + + <p>The initial assembler shipped with AIX 4.3.0 generates incorrect object +files. A fix for APAR IX74254 (64BIT DISASSEMBLED OUTPUT FROM COMPILER FAILS +TO ASSEMBLE/BIND) is available from IBM Customer Support and from its +<a href="http://techsupport.services.ibm.com/">techsupport.services.ibm.com</a> +website as PTF U453956. This fix is incorporated in AIX 4.3.1 and above. + + <p>AIX provides National Language Support (NLS). Compilers and assemblers +use NLS to support locale-specific representations of various data +formats including floating-point numbers (e.g., ‘<samp><span class="samp">.</span></samp>’ vs ‘<samp><span class="samp">,</span></samp>’ for +separating decimal fractions). There have been problems reported where +GCC does not produce the same floating-point formats that the assembler +expects. If one encounters this problem, set the <samp><span class="env">LANG</span></samp> +environment variable to ‘<samp><span class="samp">C</span></samp>’ or ‘<samp><span class="samp">En_US</span></samp>’. + + <p>A default can be specified with the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp> +switch and using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>. + + <p><hr /> + +<h3 class="heading"><a name="TOC21"></a><a name="iq2000_002dx_002delf"></a>iq2000-*-elf</h3> + +<p>Vitesse IQ2000 processors. These are used in embedded +applications. There are no standard Unix configurations. + + <p><hr /> + +<h3 class="heading"><a name="TOC22"></a><a name="lm32_002dx_002delf"></a>lm32-*-elf</h3> + +<p>Lattice Mico32 processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC23"></a><a name="lm32_002dx_002duclinux"></a>lm32-*-uclinux</h3> + +<p>Lattice Mico32 processor. +This configuration is intended for embedded systems running uClinux. + + <p><hr /> + +<h3 class="heading"><a name="TOC24"></a><a name="m32c_002dx_002delf"></a>m32c-*-elf</h3> + +<p>Renesas M32C processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC25"></a><a name="m32r_002dx_002delf"></a>m32r-*-elf</h3> + +<p>Renesas M32R processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC26"></a><a name="m6811_002delf"></a>m6811-elf</h3> + +<p>Motorola 68HC11 family micro controllers. These are used in embedded +applications. There are no standard Unix configurations. + + <p><hr /> + +<h3 class="heading"><a name="TOC27"></a><a name="m6812_002delf"></a>m6812-elf</h3> + +<p>Motorola 68HC12 family micro controllers. These are used in embedded +applications. There are no standard Unix configurations. + + <p><hr /> + +<h3 class="heading"><a name="TOC28"></a><a name="m68k_002dx_002dx"></a>m68k-*-*</h3> + +<p>By default, +‘<samp><span class="samp">m68k-*-elf*</span></samp>’, ‘<samp><span class="samp">m68k-*-rtems</span></samp>’, ‘<samp><span class="samp">m68k-*-uclinux</span></samp>’ and +‘<samp><span class="samp">m68k-*-linux</span></samp>’ +build libraries for both M680x0 and ColdFire processors. If you only +need the M680x0 libraries, you can omit the ColdFire ones by passing +<samp><span class="option">--with-arch=m68k</span></samp> to <samp><span class="command">configure</span></samp>. Alternatively, you +can omit the M680x0 libraries by passing <samp><span class="option">--with-arch=cf</span></samp> to +<samp><span class="command">configure</span></samp>. These targets default to 5206 or 5475 code as +appropriate for the target system when +configured with <samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise. + + <p>The ‘<samp><span class="samp">m68k-*-netbsd</span></samp>’ and +‘<samp><span class="samp">m68k-*-openbsd</span></samp>’ targets also support the <samp><span class="option">--with-arch</span></samp> +option. They will generate ColdFire CFV4e code when configured with +<samp><span class="option">--with-arch=cf</span></samp> and 68020 code otherwise. + + <p>You can override the default processors listed above by configuring +with <samp><span class="option">--with-cpu=</span><var>target</var></samp>. This <var>target</var> can either +be a <samp><span class="option">-mcpu</span></samp> argument or one of the following values: +‘<samp><span class="samp">m68000</span></samp>’, ‘<samp><span class="samp">m68010</span></samp>’, ‘<samp><span class="samp">m68020</span></samp>’, ‘<samp><span class="samp">m68030</span></samp>’, +‘<samp><span class="samp">m68040</span></samp>’, ‘<samp><span class="samp">m68060</span></samp>’, ‘<samp><span class="samp">m68020-40</span></samp>’ and ‘<samp><span class="samp">m68020-60</span></samp>’. + + <p><hr /> + +<h3 class="heading"><a name="TOC29"></a><a name="m68k_002dx_002duclinux"></a>m68k-*-uclinux</h3> + +<p>GCC 4.3 changed the uClinux configuration so that it uses the +‘<samp><span class="samp">m68k-linux-gnu</span></samp>’ ABI rather than the ‘<samp><span class="samp">m68k-elf</span></samp>’ ABI. +It also added improved support for C++ and flat shared libraries, +both of which were ABI changes. However, you can still use the +original ABI by configuring for ‘<samp><span class="samp">m68k-uclinuxoldabi</span></samp>’ or +‘<samp><span class="samp">m68k-</span><var>vendor</var><span class="samp">-uclinuxoldabi</span></samp>’. + + <p><hr /> + +<h3 class="heading"><a name="TOC30"></a><a name="mep_002dx_002delf"></a>mep-*-elf</h3> + +<p>Toshiba Media embedded Processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC31"></a><a name="microblaze_002dx_002delf"></a>microblaze-*-elf</h3> + +<p>Xilinx MicroBlaze processor. +This configuration is intended for embedded systems. + + <p><hr /> + +<h3 class="heading"><a name="TOC32"></a><a name="mips_002dx_002dx"></a>mips-*-*</h3> + +<p>If on a MIPS system you get an error message saying “does not have gp +sections for all it's [sic] sectons [sic]”, don't worry about it. This +happens whenever you use GAS with the MIPS linker, but there is not +really anything wrong, and it is okay to use the output file. You can +stop such warnings by installing the GNU linker. + + <p>It would be nice to extend GAS to produce the gp tables, but they are +optional, and there should not be a warning about their absence. + + <p>The libstdc++ atomic locking routines for MIPS targets requires MIPS II +and later. A patch went in just after the GCC 3.3 release to +make ‘<samp><span class="samp">mips*-*-*</span></samp>’ use the generic implementation instead. You can also +configure for ‘<samp><span class="samp">mipsel-elf</span></samp>’ as a workaround. The +‘<samp><span class="samp">mips*-*-linux*</span></samp>’ target continues to use the MIPS II routines. More +work on this is expected in future releases. + +<!-- If you make -with-llsc the default for another target, please also --> +<!-- update the description of the -with-llsc option. --> + <p>The built-in <code>__sync_*</code> functions are available on MIPS II and +later systems and others that support the ‘<samp><span class="samp">ll</span></samp>’, ‘<samp><span class="samp">sc</span></samp>’ and +‘<samp><span class="samp">sync</span></samp>’ instructions. This can be overridden by passing +<samp><span class="option">--with-llsc</span></samp> or <samp><span class="option">--without-llsc</span></samp> when configuring GCC. +Since the Linux kernel emulates these instructions if they are +missing, the default for ‘<samp><span class="samp">mips*-*-linux*</span></samp>’ targets is +<samp><span class="option">--with-llsc</span></samp>. The <samp><span class="option">--with-llsc</span></samp> and +<samp><span class="option">--without-llsc</span></samp> configure options may be overridden at compile +time by passing the <samp><span class="option">-mllsc</span></samp> or <samp><span class="option">-mno-llsc</span></samp> options to +the compiler. + + <p>MIPS systems check for division by zero (unless +<samp><span class="option">-mno-check-zero-division</span></samp> is passed to the compiler) by +generating either a conditional trap or a break instruction. Using +trap results in smaller code, but is only supported on MIPS II and +later. Also, some versions of the Linux kernel have a bug that +prevents trap from generating the proper signal (<code>SIGFPE</code>). To enable +the use of break, use the <samp><span class="option">--with-divide=breaks</span></samp> +<samp><span class="command">configure</span></samp> option when configuring GCC. The default is to +use traps on systems that support them. + + <p>Cross-compilers for the MIPS as target using the MIPS assembler +currently do not work, because the auxiliary programs +<samp><span class="file">mips-tdump.c</span></samp> and <samp><span class="file">mips-tfile.c</span></samp> can't be compiled on +anything but a MIPS. It does work to cross compile for a MIPS +if you use the GNU assembler and linker. + + <p>The assembler from GNU binutils 2.17 and earlier has a bug in the way +it sorts relocations for REL targets (o32, o64, EABI). This can cause +bad code to be generated for simple C++ programs. Also the linker +from GNU binutils versions prior to 2.17 has a bug which causes the +runtime linker stubs in very large programs, like <samp><span class="file">libgcj.so</span></samp>, to +be incorrectly generated. GNU Binutils 2.18 and later (and snapshots +made after Nov. 9, 2006) should be free from both of these problems. + + <p><hr /> + +<h3 class="heading"><a name="TOC33"></a><a name="mips_002dsgi_002dirix5"></a>mips-sgi-irix5</h3> + +<p>Support for IRIX 5 has been removed in GCC 4.6. + + <p><hr /> + +<h3 class="heading"><a name="TOC34"></a><a name="mips_002dsgi_002dirix6"></a>mips-sgi-irix6</h3> + +<p>Support for IRIX 6 releases before 6.5 has been removed in GCC 4.6, as +well as support for +the O32 ABI. It is <em>strongly</em> recommended to upgrade to at least +IRIX 6.5.18. This release introduced full ISO C99 support, though for +the N32 and N64 ABIs only. + + <p>To build and use GCC on IRIX 6.5, you need the IRIX Development Foundation +(IDF) and IRIX Development Libraries (IDL). They are included with the +IRIX 6.5 media. + + <p>If you are using SGI's MIPSpro <samp><span class="command">cc</span></samp> as your bootstrap compiler, you must +ensure that the N32 ABI is in use. To test this, compile a simple C +file with <samp><span class="command">cc</span></samp> and then run <samp><span class="command">file</span></samp> on the +resulting object file. The output should look like: + +<pre class="smallexample"> test.o: ELF N32 MSB ... +</pre> + <p class="noindent">If you see: + +<pre class="smallexample"> test.o: ELF 32-bit MSB ... +</pre> + <p class="noindent">or + +<pre class="smallexample"> test.o: ELF 64-bit MSB ... +</pre> + <p class="noindent">then your version of <samp><span class="command">cc</span></samp> uses the O32 or N64 ABI by default. You +should set the environment variable <samp><span class="env">CC</span></samp> to ‘<samp><span class="samp">cc -n32</span></samp>’ +before configuring GCC. + + <p>If you want the resulting <samp><span class="command">gcc</span></samp> to run on old 32-bit systems +with the MIPS R4400 CPU, you need to ensure that only code for the ‘<samp><span class="samp">mips3</span></samp>’ +instruction set architecture (ISA) is generated. While GCC 3.x does +this correctly, both GCC 2.95 and SGI's MIPSpro <samp><span class="command">cc</span></samp> may change +the ISA depending on the machine where GCC is built. Using one of them +as the bootstrap compiler may result in ‘<samp><span class="samp">mips4</span></samp>’ code, which won't run at +all on ‘<samp><span class="samp">mips3</span></samp>’-only systems. For the test program above, you should see: + +<pre class="smallexample"> test.o: ELF N32 MSB mips-3 ... +</pre> + <p class="noindent">If you get: + +<pre class="smallexample"> test.o: ELF N32 MSB mips-4 ... +</pre> + <p class="noindent">instead, you should set the environment variable <samp><span class="env">CC</span></samp> to ‘<samp><span class="samp">cc +-n32 -mips3</span></samp>’ or ‘<samp><span class="samp">gcc -mips3</span></samp>’ respectively before configuring GCC. + + <p>MIPSpro C 7.4 may cause bootstrap failures, due to a bug when inlining +<code>memcmp</code>. Either add <code>-U__INLINE_INTRINSICS</code> to the <samp><span class="env">CC</span></samp> +environment variable as a workaround or upgrade to MIPSpro C 7.4.1m. + + <p>GCC on IRIX 6.5 is usually built to support the N32 and N64 ABIs. If +you build GCC on a system that doesn't have the N64 libraries installed +or cannot run 64-bit binaries, +you need to configure with <samp><span class="option">--disable-multilib</span></samp> so GCC doesn't +try to use them. +Look for <samp><span class="file">/usr/lib64/libc.so.1</span></samp> to see if you +have the 64-bit libraries installed. + + <p>GCC must be configured with GNU <samp><span class="command">as</span></samp>. The latest version, from GNU +binutils 2.21, is known to work. On the other hand, bootstrap fails +with GNU <samp><span class="command">ld</span></samp> at least since GNU binutils 2.17. + + <p>The <samp><span class="option">--enable-libgcj</span></samp> +option is disabled by default: IRIX 6 uses a very low default limit +(20480) for the command line length. Although <samp><span class="command">libtool</span></samp> contains a +workaround for this problem, at least the N64 ‘<samp><span class="samp">libgcj</span></samp>’ is known not +to build despite this, running into an internal error of the native +<samp><span class="command">ld</span></samp>. A sure fix is to increase this limit (‘<samp><span class="samp">ncargs</span></samp>’) to +its maximum of 262144 bytes. If you have root access, you can use the +<samp><span class="command">systune</span></samp> command to do this. +<!-- FIXME: does this work with current libtool? --> + + <p><code>wchar_t</code> support in ‘<samp><span class="samp">libstdc++</span></samp>’ is not available for old +IRIX 6.5.x releases, x < 19. The problem cannot be autodetected +and in order to build GCC for such targets you need to configure with +<samp><span class="option">--disable-wchar_t</span></samp>. + + <p><hr /> + +<h3 class="heading"><a name="TOC35"></a><a name="moxie_002dx_002delf"></a>moxie-*-elf</h3> + +<p>The moxie processor. See <a href="http://moxielogic.org/">http://moxielogic.org/</a> for more +information about this processor. + + <p><hr /> + +<h3 class="heading"><a name="TOC36"></a><a name="powerpc_002dx_002dx"></a>powerpc-*-*</h3> + +<p>You can specify a default version for the <samp><span class="option">-mcpu=</span><var>cpu_type</var></samp> +switch by using the configure option <samp><span class="option">--with-cpu-</span><var>cpu_type</var></samp>. + + <p>You will need +<a href="ftp://ftp.kernel.org/pub/linux/devel/binutils">binutils 2.15</a> +or newer for a working GCC. + + <p><hr /> + +<h3 class="heading"><a name="TOC37"></a><a name="powerpc_002dx_002ddarwin"></a>powerpc-*-darwin*</h3> + +<p>PowerPC running Darwin (Mac OS X kernel). + + <p>Pre-installed versions of Mac OS X may not include any developer tools, +meaning that you will not be able to build GCC from source. Tool +binaries are available at +<a href="http://opensource.apple.com/">http://opensource.apple.com/</a>. + + <p>This version of GCC requires at least cctools-590.36. The +cctools-590.36 package referenced from +<a href="http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html">http://gcc.gnu.org/ml/gcc/2006-03/msg00507.html</a> will not work +on systems older than 10.3.9 (aka darwin7.9.0). + + <p><hr /> + +<h3 class="heading"><a name="TOC38"></a><a name="powerpc_002dx_002delf"></a>powerpc-*-elf</h3> + +<p>PowerPC system in big endian mode, running System V.4. + + <p><hr /> + +<h3 class="heading"><a name="TOC39"></a><a name="powerpc_002dx_002dlinux_002dgnu"></a>powerpc*-*-linux-gnu*</h3> + +<p>PowerPC system in big endian mode running Linux. + + <p><hr /> + +<h3 class="heading"><a name="TOC40"></a><a name="powerpc_002dx_002dnetbsd"></a>powerpc-*-netbsd*</h3> + +<p>PowerPC system in big endian mode running NetBSD. + + <p><hr /> + +<h3 class="heading"><a name="TOC41"></a><a name="powerpc_002dx_002deabisim"></a>powerpc-*-eabisim</h3> + +<p>Embedded PowerPC system in big endian mode for use in running under the +PSIM simulator. + + <p><hr /> + +<h3 class="heading"><a name="TOC42"></a><a name="powerpc_002dx_002deabi"></a>powerpc-*-eabi</h3> + +<p>Embedded PowerPC system in big endian mode. + + <p><hr /> + +<h3 class="heading"><a name="TOC43"></a><a name="powerpcle_002dx_002delf"></a>powerpcle-*-elf</h3> + +<p>PowerPC system in little endian mode, running System V.4. + + <p><hr /> + +<h3 class="heading"><a name="TOC44"></a><a name="powerpcle_002dx_002deabisim"></a>powerpcle-*-eabisim</h3> + +<p>Embedded PowerPC system in little endian mode for use in running under +the PSIM simulator. + + <p><hr /> + +<h3 class="heading"><a name="TOC45"></a><a name="powerpcle_002dx_002deabi"></a>powerpcle-*-eabi</h3> + +<p>Embedded PowerPC system in little endian mode. + + <p><hr /> + +<h3 class="heading"><a name="TOC46"></a><a name="rx_002dx_002delf"></a>rx-*-elf</h3> + +<p>The Renesas RX processor. See +<a href="http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series">http://eu.renesas.com/fmwk.jsp?cnt=rx600_series_landing.jsp&fp=/products/mpumcu/rx_family/rx600_series</a> +for more information about this processor. + + <p><hr /> + +<h3 class="heading"><a name="TOC47"></a><a name="s390_002dx_002dlinux"></a>s390-*-linux*</h3> + +<p>S/390 system running GNU/Linux for S/390. + + <p><hr /> + +<h3 class="heading"><a name="TOC48"></a><a name="s390x_002dx_002dlinux"></a>s390x-*-linux*</h3> + +<p>zSeries system (64-bit) running GNU/Linux for zSeries. + + <p><hr /> + +<h3 class="heading"><a name="TOC49"></a><a name="s390x_002dibm_002dtpf"></a>s390x-ibm-tpf*</h3> + +<p>zSeries system (64-bit) running TPF. This platform is +supported as cross-compilation target only. + + <p><hr /><!-- Please use Solaris 2 to refer to all release of Solaris, starting --> +<!-- with 2.0 until 2.6, 7, 8, etc. Solaris 1 was a marketing name for --> +<!-- SunOS 4 releases which we don't use to avoid confusion. Solaris --> +<!-- alone is too unspecific and must be avoided. --> + +<h3 class="heading"><a name="TOC50"></a><a name="x_002dx_002dsolaris2"></a>*-*-solaris2*</h3> + +<p>Support for Solaris 7 has been removed in GCC 4.6. + + <p>Sun does not ship a C compiler with Solaris 2, though you can download +the Sun Studio compilers for free. Alternatively, +you can install a pre-built GCC to bootstrap and install GCC. See the +<a href="binaries.html">binaries page</a> for details. + + <p>The Solaris 2 <samp><span class="command">/bin/sh</span></samp> will often fail to configure +‘<samp><span class="samp">libstdc++-v3</span></samp>’, ‘<samp><span class="samp">boehm-gc</span></samp>’ or ‘<samp><span class="samp">libjava</span></samp>’. We therefore +recommend using the following initial sequence of commands + +<pre class="smallexample"> % CONFIG_SHELL=/bin/ksh + % export CONFIG_SHELL +</pre> + <p class="noindent">and proceed as described in <a href="configure.html">the configure instructions</a>. +In addition we strongly recommend specifying an absolute path to invoke +<samp><var>srcdir</var><span class="command">/configure</span></samp>. + + <p>Solaris 2 comes with a number of optional OS packages. Some of these +are needed to use GCC fully, namely <code>SUNWarc</code>, +<code>SUNWbtool</code>, <code>SUNWesu</code>, <code>SUNWhea</code>, <code>SUNWlibm</code>, +<code>SUNWsprot</code>, and <code>SUNWtoo</code>. If you did not install all +optional packages when installing Solaris 2, you will need to verify that +the packages that GCC needs are installed. + + <p>To check whether an optional package is installed, use +the <samp><span class="command">pkginfo</span></samp> command. To add an optional package, use the +<samp><span class="command">pkgadd</span></samp> command. For further details, see the Solaris 2 +documentation. + + <p>Trying to use the linker and other tools in +<samp><span class="file">/usr/ucb</span></samp> to install GCC has been observed to cause trouble. +For example, the linker may hang indefinitely. The fix is to remove +<samp><span class="file">/usr/ucb</span></samp> from your <samp><span class="env">PATH</span></samp>. + + <p>The build process works more smoothly with the legacy Sun tools so, if you +have <samp><span class="file">/usr/xpg4/bin</span></samp> in your <samp><span class="env">PATH</span></samp>, we recommend that you place +<samp><span class="file">/usr/bin</span></samp> before <samp><span class="file">/usr/xpg4/bin</span></samp> for the duration of the build. + + <p>We recommend the use of the Sun assembler or the GNU assembler, in +conjunction with the Sun linker. The GNU <samp><span class="command">as</span></samp> +versions included in Solaris 10, from GNU binutils 2.15, and Solaris 11, +from GNU binutils 2.19, are known to work. They can be found in +<samp><span class="file">/usr/sfw/bin/gas</span></samp>. Current versions of GNU binutils (2.21) +are known to work as well. Note that your mileage may vary +if you use a combination of the GNU tools and the Sun tools: while the +combination GNU <samp><span class="command">as</span></samp> + Sun <samp><span class="command">ld</span></samp> should reasonably work, +the reverse combination Sun <samp><span class="command">as</span></samp> + GNU <samp><span class="command">ld</span></samp> is known to +cause memory corruption at runtime in some cases for C++ programs. +<!-- FIXME: still? --> +GNU <samp><span class="command">ld</span></samp> usually works as well, although the version included in +Solaris 10 cannot be used due to several bugs. Again, the current +version (2.21) is known to work, but generally lacks platform specific +features, so better stay with Sun <samp><span class="command">ld</span></samp>. + + <p>To enable symbol versioning in ‘<samp><span class="samp">libstdc++</span></samp>’ with Sun <samp><span class="command">ld</span></samp>, +you need to have any version of GNU <samp><span class="command">c++filt</span></samp>, which is part of +GNU binutils. ‘<samp><span class="samp">libstdc++</span></samp>’ symbol versioning will be disabled if no +appropriate version is found. Sun <samp><span class="command">c++filt</span></samp> from the Sun Studio +compilers does <em>not</em> work. + + <p>Sun bug 4296832 turns up when compiling X11 headers with GCC 2.95 or +newer: <samp><span class="command">g++</span></samp> will complain that types are missing. These headers +assume that omitting the type means <code>int</code>; this assumption worked for +C90 but is wrong for C++, and is now wrong for C99 also. + + <p><samp><span class="command">g++</span></samp> accepts such (invalid) constructs with the option +<samp><span class="option">-fpermissive</span></samp>; it will assume that any missing type is <code>int</code> +(as defined by C90). + + <p>There are patches for Solaris 8 (108652-24 or newer for SPARC, +108653-22 for Intel) that fix this bug. + + <p>Sun bug 4927647 sometimes causes random spurious testsuite failures +related to missing diagnostic output. This bug doesn't affect GCC +itself, rather it is a kernel bug triggered by the <samp><span class="command">expect</span></samp> +program which is used only by the GCC testsuite driver. When the bug +causes the <samp><span class="command">expect</span></samp> program to miss anticipated output, extra +testsuite failures appear. + + <p>There are patches for Solaris 8 (117350-12 or newer for SPARC, +117351-12 or newer for Intel) and Solaris 9 (117171-11 or newer for +SPARC, 117172-11 or newer for Intel) that address this problem. + + <p>Solaris 8 provides an alternate implementation of the thread libraries, +‘<samp><span class="samp">libpthread</span></samp>’ and ‘<samp><span class="samp">libthread</span></samp>’. They are required for TLS +support and have been made the default in Solaris 9, so they are always +used on Solaris 8. + + <p>Thread-local storage (TLS) is supported in Solaris 8 and 9, but requires +some patches. The ‘<samp><span class="samp">libthread</span></samp>’ patches provide the +<code>__tls_get_addr</code> (SPARC, 64-bit x86) resp. <code>___tls_get_addr</code> +(32-bit x86) functions. On Solaris 8, you need 108993-26 or newer on +SPARC, 108994-26 or newer on Intel. On Solaris 9, the necessary support +on SPARC is present since FCS, while 114432-05 or newer is required on +Intel. Additionally, on Solaris 8, patch 109147-14 or newer on SPARC or +109148-22 or newer on Intel are required for the Sun <samp><span class="command">ld</span></samp> and +runtime linker (<samp><span class="command">ld.so.1</span></samp>) support. Again, Solaris 9/SPARC +works since FCS, while 113986-02 is required on Intel. The linker +patches must be installed even if GNU <samp><span class="command">ld</span></samp> is used. Sun +<samp><span class="command">as</span></samp> in Solaris 8 and 9 doesn't support the necessary +relocations, so GNU <samp><span class="command">as</span></samp> must be used. The <samp><span class="command">configure</span></samp> +script checks for those prerequisites and automatically enables TLS +support if they are met. Although those minimal patch versions should +work, it is recommended to use the latest patch versions which include +additional bug fixes. + + <p><hr /> + +<h3 class="heading"><a name="TOC51"></a><a name="sparc_002dx_002dx"></a>sparc*-*-*</h3> + +<p>This section contains general configuration information for all +SPARC-based platforms. In addition to reading this section, please +read all other sections that match your target. + + <p>Newer versions of the GNU Multiple Precision Library (GMP), the MPFR +library and the MPC library are known to be miscompiled by earlier +versions of GCC on these platforms. We therefore recommend the use +of the exact versions of these libraries listed as minimal versions +in <a href="prerequisites.html">the prerequisites</a>. + + <p><hr /> + +<h3 class="heading"><a name="TOC52"></a><a name="sparc_002dsun_002dsolaris2"></a>sparc-sun-solaris2*</h3> + +<p>When GCC is configured to use GNU binutils 2.14 or later, the binaries +produced are smaller than the ones produced using Sun's native tools; +this difference is quite significant for binaries containing debugging +information. + + <p>Starting with Solaris 7, the operating system is capable of executing +64-bit SPARC V9 binaries. GCC 3.1 and later properly supports +this; the <samp><span class="option">-m64</span></samp> option enables 64-bit code generation. +However, if all you want is code tuned for the UltraSPARC CPU, you +should try the <samp><span class="option">-mtune=ultrasparc</span></samp> option instead, which produces +code that, unlike full 64-bit code, can still run on non-UltraSPARC +machines. + + <p>When configuring on a Solaris 7 or later system that is running a kernel +that supports only 32-bit binaries, one must configure with +<samp><span class="option">--disable-multilib</span></samp>, since we will not be able to build the +64-bit target libraries. + + <p>GCC 3.3 and GCC 3.4 trigger code generation bugs in earlier versions of +the GNU compiler (especially GCC 3.0.x versions), which lead to the +miscompilation of the stage1 compiler and the subsequent failure of the +bootstrap process. A workaround is to use GCC 3.2.3 as an intermediary +stage, i.e. to bootstrap that compiler with the base compiler and then +use it to bootstrap the final compiler. + + <p>GCC 3.4 triggers a code generation bug in versions 5.4 (Sun ONE Studio 7) +and 5.5 (Sun ONE Studio 8) of the Sun compiler, which causes a bootstrap +failure in form of a miscompilation of the stage1 compiler by the Sun +compiler. This is Sun bug 4974440. This is fixed with patch 112760-07. + + <p>GCC 3.4 changed the default debugging format from Stabs to DWARF-2 for +32-bit code on Solaris 7 and later. If you use the Sun assembler, this +change apparently runs afoul of Sun bug 4910101 (which is referenced as +an x86-only problem by Sun, probably because they do not use DWARF-2). +A symptom of the problem is that you cannot compile C++ programs like +<samp><span class="command">groff</span></samp> 1.19.1 without getting messages similar to the following: + +<pre class="smallexample"> ld: warning: relocation error: R_SPARC_UA32: ... + external symbolic relocation against non-allocatable section + .debug_info cannot be processed at runtime: relocation ignored. +</pre> + <p class="noindent">To work around this problem, compile with <samp><span class="option">-gstabs+</span></samp> instead of +plain <samp><span class="option">-g</span></samp>. + + <p>When configuring the GNU Multiple Precision Library (GMP), the MPFR +library or the MPC library on a Solaris 7 or later system, the canonical +target triplet must be specified as the <samp><span class="command">build</span></samp> parameter on the +configure line. This target triplet can be obtained by invoking <samp><span class="command">./config.guess</span></samp> in the toplevel source directory of GCC (and +not that of GMP or MPFR or MPC). For example on a Solaris 9 system: + +<pre class="smallexample"> % ./configure --build=sparc-sun-solaris2.9 --prefix=xxx +</pre> + <p><hr /> + +<h3 class="heading"><a name="TOC53"></a><a name="sparc_002dsun_002dsolaris210"></a>sparc-sun-solaris2.10</h3> + +<p>There is a bug in older versions of the Sun assembler which breaks +thread-local storage (TLS). A typical error message is + +<pre class="smallexample"> ld: fatal: relocation error: R_SPARC_TLS_LE_HIX22: file /var/tmp//ccamPA1v.o: + symbol <unknown>: bad symbol type SECT: symbol type must be TLS +</pre> + <p class="noindent">This bug is fixed in Sun patch 118683-03 or later. + + <p><hr /> + +<h3 class="heading"><a name="TOC54"></a><a name="sparc_002dx_002dlinux"></a>sparc-*-linux*</h3> + +<p>GCC versions 3.0 and higher require binutils 2.11.2 and glibc 2.2.4 +or newer on this platform. All earlier binutils and glibc +releases mishandled unaligned relocations on <code>sparc-*-*</code> targets. + + <p><hr /> + +<h3 class="heading"><a name="TOC55"></a><a name="sparc64_002dx_002dsolaris2"></a>sparc64-*-solaris2*</h3> + +<p>When configuring the GNU Multiple Precision Library (GMP), the MPFR +library or the MPC library, the canonical target triplet must be specified +as the <samp><span class="command">build</span></samp> parameter on the configure line. For example +on a Solaris 9 system: + +<pre class="smallexample"> % ./configure --build=sparc64-sun-solaris2.9 --prefix=xxx +</pre> + <p>The following compiler flags must be specified in the configure +step in order to bootstrap this target with the Sun compiler: + +<pre class="smallexample"> % CC="cc -xarch=v9 -xildoff" <var>srcdir</var>/configure [<var>options</var>] [<var>target</var>] +</pre> + <p class="noindent"><samp><span class="option">-xarch=v9</span></samp> specifies the SPARC-V9 architecture to the Sun toolchain +and <samp><span class="option">-xildoff</span></samp> turns off the incremental linker. + + <p><hr /> + +<h3 class="heading"><a name="TOC56"></a><a name="sparcv9_002dx_002dsolaris2"></a>sparcv9-*-solaris2*</h3> + +<p>This is a synonym for ‘<samp><span class="samp">sparc64-*-solaris2*</span></samp>’. + + <p><hr /> + +<h3 class="heading"><a name="TOC57"></a><a name="x_002dx_002dvxworks"></a>*-*-vxworks*</h3> + +<p>Support for VxWorks is in flux. At present GCC supports <em>only</em> the +very recent VxWorks 5.5 (aka Tornado 2.2) release, and only on PowerPC. +We welcome patches for other architectures supported by VxWorks 5.5. +Support for VxWorks AE would also be welcome; we believe this is merely +a matter of writing an appropriate “configlette” (see below). We are +not interested in supporting older, a.out or COFF-based, versions of +VxWorks in GCC 3. + + <p>VxWorks comes with an older version of GCC installed in +<samp><var>$WIND_BASE</var><span class="file">/host</span></samp>; we recommend you do not overwrite it. +Choose an installation <var>prefix</var> entirely outside <var>$WIND_BASE</var>. +Before running <samp><span class="command">configure</span></samp>, create the directories <samp><var>prefix</var></samp> +and <samp><var>prefix</var><span class="file">/bin</span></samp>. Link or copy the appropriate assembler, +linker, etc. into <samp><var>prefix</var><span class="file">/bin</span></samp>, and set your <var>PATH</var> to +include that directory while running both <samp><span class="command">configure</span></samp> and +<samp><span class="command">make</span></samp>. + + <p>You must give <samp><span class="command">configure</span></samp> the +<samp><span class="option">--with-headers=</span><var>$WIND_BASE</var><span class="option">/target/h</span></samp> switch so that it can +find the VxWorks system headers. Since VxWorks is a cross compilation +target only, you must also specify <samp><span class="option">--target=</span><var>target</var></samp>. +<samp><span class="command">configure</span></samp> will attempt to create the directory +<samp><var>prefix</var><span class="file">/</span><var>target</var><span class="file">/sys-include</span></samp> and copy files into it; +make sure the user running <samp><span class="command">configure</span></samp> has sufficient privilege +to do so. + + <p>GCC's exception handling runtime requires a special “configlette” +module, <samp><span class="file">contrib/gthr_supp_vxw_5x.c</span></samp>. Follow the instructions in +that file to add the module to your kernel build. (Future versions of +VxWorks will incorporate this module.) + + <p><hr /> + +<h3 class="heading"><a name="TOC58"></a><a name="x86_002d64_002dx_002dx"></a>x86_64-*-*, amd64-*-*</h3> + +<p>GCC supports the x86-64 architecture implemented by the AMD64 processor +(amd64-*-* is an alias for x86_64-*-*) on GNU/Linux, FreeBSD and NetBSD. +On GNU/Linux the default is a bi-arch compiler which is able to generate +both 64-bit x86-64 and 32-bit x86 code (via the <samp><span class="option">-m32</span></samp> switch). + + <p><hr /> + +<h3 class="heading"><a name="TOC59"></a><a name="xtensa_002dx_002delf"></a>xtensa*-*-elf</h3> + +<p>This target is intended for embedded Xtensa systems using the +‘<samp><span class="samp">newlib</span></samp>’ C library. It uses ELF but does not support shared +objects. Designed-defined instructions specified via the +Tensilica Instruction Extension (TIE) language are only supported +through inline assembly. + + <p>The Xtensa configuration information must be specified prior to +building GCC. The <samp><span class="file">include/xtensa-config.h</span></samp> header +file contains the configuration information. If you created your +own Xtensa configuration with the Xtensa Processor Generator, the +downloaded files include a customized copy of this header file, +which you can use to replace the default header file. + + <p><hr /> + +<h3 class="heading"><a name="TOC60"></a><a name="xtensa_002dx_002dlinux"></a>xtensa*-*-linux*</h3> + +<p>This target is for Xtensa systems running GNU/Linux. It supports ELF +shared objects and the GNU C library (glibc). It also generates +position-independent code (PIC) regardless of whether the +<samp><span class="option">-fpic</span></samp> or <samp><span class="option">-fPIC</span></samp> options are used. In other +respects, this target is the same as the +<a href="#xtensa*-*-elf">‘<samp><span class="samp">xtensa*-*-elf</span></samp>’</a> target. + + <p><hr /> + +<h3 class="heading"><a name="TOC61"></a><a name="windows"></a>Microsoft Windows</h3> + +<h4 class="subheading"><a name="TOC62"></a>Intel 16-bit versions</h4> + +<p>The 16-bit versions of Microsoft Windows, such as Windows 3.1, are not +supported. + + <p>However, the 32-bit port has limited support for Microsoft +Windows 3.11 in the Win32s environment, as a target only. See below. + +<h4 class="subheading"><a name="TOC63"></a>Intel 32-bit versions</h4> + +<p>The 32-bit versions of Windows, including Windows 95, Windows NT, Windows +XP, and Windows Vista, are supported by several different target +platforms. These targets differ in which Windows subsystem they target +and which C libraries are used. + + <ul> +<li>Cygwin <a href="#x-x-cygwin">*-*-cygwin</a>: Cygwin provides a user-space +Linux API emulation layer in the Win32 subsystem. +<li>Interix <a href="#x-x-interix">*-*-interix</a>: The Interix subsystem +provides native support for POSIX. +<li>MinGW <a href="#x-x-mingw32">*-*-mingw32</a>: MinGW is a native GCC port for +the Win32 subsystem that provides a subset of POSIX. +<li>MKS i386-pc-mks: NuTCracker from MKS. See +<a href="http://www.mkssoftware.com/">http://www.mkssoftware.com/</a> for more information. +</ul> + +<h4 class="subheading"><a name="TOC64"></a>Intel 64-bit versions</h4> + +<p>GCC contains support for x86-64 using the mingw-w64 +runtime library, available from <a href="http://mingw-w64.sourceforge.net/">http://mingw-w64.sourceforge.net/</a>. +This library should be used with the target triple x86_64-pc-mingw32. + + <p>Presently Windows for Itanium is not supported. + +<h4 class="subheading"><a name="TOC65"></a>Windows CE</h4> + +<p>Windows CE is supported as a target only on ARM (arm-wince-pe), Hitachi +SuperH (sh-wince-pe), and MIPS (mips-wince-pe). + +<h4 class="subheading"><a name="TOC66"></a>Other Windows Platforms</h4> + +<p>GCC no longer supports Windows NT on the Alpha or PowerPC. + + <p>GCC no longer supports the Windows POSIX subsystem. However, it does +support the Interix subsystem. See above. + + <p>Old target names including *-*-winnt and *-*-windowsnt are no longer used. + + <p>PW32 (i386-pc-pw32) support was never completed, and the project seems to +be inactive. See <a href="http://pw32.sourceforge.net/">http://pw32.sourceforge.net/</a> for more information. + + <p>UWIN support has been removed due to a lack of maintenance. + + <p><hr /> + +<h3 class="heading"><a name="TOC67"></a><a name="x_002dx_002dcygwin"></a>*-*-cygwin</h3> + +<p>Ports of GCC are included with the +<a href="http://www.cygwin.com/">Cygwin environment</a>. + + <p>GCC will build under Cygwin without modification; it does not build +with Microsoft's C++ compiler and there are no plans to make it do so. + + <p>The Cygwin native compiler can be configured to target any 32-bit x86 +cpu architecture desired; the default is i686-pc-cygwin. It should be +used with as up-to-date a version of binutils as possible; use either +the latest official GNU binutils release in the Cygwin distribution, +or version 2.20 or above if building your own. + + <p><hr /> + +<h3 class="heading"><a name="TOC68"></a><a name="x_002dx_002dinterix"></a>*-*-interix</h3> + +<p>The Interix target is used by OpenNT, Interix, Services For UNIX (SFU), +and Subsystem for UNIX-based Applications (SUA). Applications compiled +with this target run in the Interix subsystem, which is separate from +the Win32 subsystem. This target was last known to work in GCC 3.3. + + <p><hr /> + +<h3 class="heading"><a name="TOC69"></a><a name="x_002dx_002dmingw32"></a>*-*-mingw32</h3> + +<p>GCC will build with and support only MinGW runtime 3.12 and later. +Earlier versions of headers are incompatible with the new default semantics +of <code>extern inline</code> in <code>-std=c99</code> and <code>-std=gnu99</code> modes. + + <p><hr /> + +<h3 class="heading"><a name="TOC70"></a><a name="older"></a>Older systems</h3> + +<p>GCC contains support files for many older (1980s and early +1990s) Unix variants. For the most part, support for these systems +has not been deliberately removed, but it has not been maintained for +several years and may suffer from bitrot. + + <p>Starting with GCC 3.1, each release has a list of “obsoleted” systems. +Support for these systems is still present in that release, but +<samp><span class="command">configure</span></samp> will fail unless the <samp><span class="option">--enable-obsolete</span></samp> +option is given. Unless a maintainer steps forward, support for these +systems will be removed from the next release of GCC. + + <p>Support for old systems as hosts for GCC can cause problems if the +workarounds for compiler, library and operating system bugs affect the +cleanliness or maintainability of the rest of GCC. In some cases, to +bring GCC up on such a system, if still possible with current GCC, may +require first installing an old version of GCC which did work on that +system, and using it to compile a more recent GCC, to avoid bugs in the +vendor compiler. Old releases of GCC 1 and GCC 2 are available in the +<samp><span class="file">old-releases</span></samp> directory on the <a href="../mirrors.html">GCC mirror sites</a>. Header bugs may generally be avoided using +<samp><span class="command">fixincludes</span></samp>, but bugs or deficiencies in libraries and the +operating system may still cause problems. + + <p>Support for older systems as targets for cross-compilation is less +problematic than support for them as hosts for GCC; if an enthusiast +wishes to make such a target work again (including resurrecting any of +the targets that never worked with GCC 2, starting from the last +version before they were removed), patches +<a href="../contribute.html">following the usual requirements</a> would be +likely to be accepted, since they should not affect the support for more +modern targets. + + <p>For some systems, old versions of GNU binutils may also be useful, +and are available from <samp><span class="file">pub/binutils/old-releases</span></samp> on +<a href="http://sourceware.org/mirrors.html">sourceware.org mirror sites</a>. + + <p>Some of the information on specific systems above relates to +such older systems, but much of the information +about GCC on such systems (which may no longer be applicable to +current GCC) is to be found in the GCC texinfo manual. + + <p><hr /> + +<h3 class="heading"><a name="TOC71"></a><a name="elf"></a>all ELF targets (SVR4, Solaris 2, etc.)</h3> + +<p>C++ support is significantly better on ELF targets if you use the +<a href="./configure.html#with-gnu-ld">GNU linker</a>; duplicate copies of +inlines, vtables and template instantiations will be discarded +automatically. + + <p><hr /> +<p><a href="./index.html">Return to the GCC Installation page</a> + +<!-- ***Old documentation****************************************************** --> +<!-- ***GFDL******************************************************************** --> +<!-- *************************************************************************** --> +<!-- Part 6 The End of the Document --> +</body></html> + |