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diff --git a/libstdc++-v3/doc/html/manual/configure.html b/libstdc++-v3/doc/html/manual/configure.html new file mode 100644 index 000000000..70409d0c4 --- /dev/null +++ b/libstdc++-v3/doc/html/manual/configure.html @@ -0,0 +1,211 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Configure</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , configure , options "/><meta name="keywords" content=" ISO C++ , library "/><link rel="home" href="../spine.html" title="The GNU C++ Library"/><link rel="up" href="setup.html" title="Chapter 2. Setup"/><link rel="prev" href="setup.html" title="Chapter 2. Setup"/><link rel="next" href="make.html" title="Make"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Configure</th></tr><tr><td align="left"><a accesskey="p" href="setup.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Setup</th><td align="right"> <a accesskey="n" href="make.html">Next</a></td></tr></table><hr/></div><div class="section" title="Configure"><div class="titlepage"><div><div><h2 class="title"><a id="manual.intro.setup.configure"/>Configure</h2></div></div></div><p> + When configuring libstdc++, you'll have to configure the entire + <span class="emphasis"><em>gccsrcdir</em></span> directory. Consider using the + toplevel gcc configuration option + <code class="literal">--enable-languages=c++</code>, which saves time by only + building the C++ toolchain. +</p><p> + Here are all of the configure options specific to libstdc++. Keep + in mind that + + <a class="link" href="http://sourceware.org/autobook/autobook/autobook_14.html">they + all have opposite forms as well</a> (enable/disable and + with/without). The defaults are for the <span class="emphasis"><em>current + development sources</em></span>, which may be different than those + for released versions. +</p><p>The canonical way to find out the configure options that are + available for a given set of libstdc++ sources is to go to the + source directory and then type:<span class="command"><strong>./configure --help</strong></span>. +</p><div class="variablelist"><dl><dt><span class="term"><code class="code">--enable-multilib</code>[default]</span></dt><dd><p>This is part of the generic multilib support for building cross + compilers. As such, targets like "powerpc-elf" will have + libstdc++ built many different ways: "-msoft-float" + and not, etc. A different libstdc++ will be built for each of + the different multilib versions. This option is on by default. + </p></dd><dt><span class="term"><code class="code">--enable-sjlj-exceptions</code></span></dt><dd><p>Forces old, set-jump/long-jump exception handling model. If + at all possible, the new, frame unwinding exception handling routines + should be used instead, as they significantly reduce both + runtime memory usage and executable size. This option can + change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-version-specific-runtime-libs</code></span></dt><dd><p>Specify that run-time libraries should be installed in the + compiler-specific subdirectory (i.e., + <code class="code">${libdir}/gcc-lib/${target_alias}/${gcc_version}</code>) + instead of <code class="code">${libdir}</code>. This option is useful if you + intend to use several versions of gcc in parallel. In addition, + libstdc++'s include files will be installed in + <code class="code">${libdir}/gcc-lib/${target_alias}/${gcc_version}/include/g++</code>, + unless you also specify + <code class="literal">--with-gxx-include-dir=</code><code class="filename">dirname</code> during configuration. + </p></dd><dt><span class="term"><code class="code">--with-gxx-include-dir=<include-files dir></code></span></dt><dd><p>Adds support for named libstdc++ include directory. For instance, + the following puts all the libstdc++ headers into a directory + called "4.4-20090404" instead of the usual + "c++/(version)". + </p><pre class="programlisting"> + --with-gxx-include-dir=/foo/H-x86-gcc-3-c-gxx-inc/include/4.4-20090404</pre></dd><dt><span class="term"><code class="code">--enable-cstdio</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-cstdio=stdio'</code> + (described next). + </p></dd><dt><span class="term"><code class="code">--enable-cstdio=OPTION</code></span></dt><dd><p>Select a target-specific I/O package. At the moment, the only + choice is to use 'stdio', a generic "C" abstraction. + The default is 'stdio'. This option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-clocale</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-clocale=generic'</code> + (described next). + </p></dd><dt><span class="term"><code class="code">--enable-clocale=OPTION</code></span></dt><dd><p>Select a target-specific underlying locale package. The + choices are 'ieee_1003.1-2001' to specify an X/Open, Standard Unix + (IEEE Std. 1003.1-2001) model based on langinfo/iconv/catgets, + 'gnu' to specify a model based on functionality from the GNU C + library (langinfo/iconv/gettext) (from <a class="link" href="http://sources.redhat.com/glibc/">glibc</a>, the GNU C + library), or 'generic' to use a generic "C" + abstraction which consists of "C" locale info. + </p><p>If not explicitly specified, the configure proccess tries + to guess the most suitable package from the choices above. The + default is 'generic'. On glibc-based systems of sufficient + vintage (2.3 and newer), 'gnu' is automatically selected. This option + can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-allocator</code></span></dt><dd><p>This is an abbreviated form of + <code class="code">'--enable-libstdcxx-allocator=auto'</code> (described + next). + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-allocator=OPTION </code></span></dt><dd><p>Select a target-specific underlying std::allocator. The + choices are 'new' to specify a wrapper for new, 'malloc' to + specify a wrapper for malloc, 'mt' for a fixed power of two allocator, + 'pool' for the SGI pooled allocator or 'bitmap' for a bitmap allocator. + See this page for more information on allocator + <a class="link" href="memory.html#allocator.ext" title="Extension Allocators">extensions</a>. This option + can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-cheaders=OPTION</code></span></dt><dd><p>This allows the user to define the approach taken for C header + compatibility with C++. Options are c, c_std, and c_global. + These correspond to the source directory's include/c, + include/c_std, and include/c_global, and may also include + include/c_compatibility. The default is 'c_global'. + </p></dd><dt><span class="term"><code class="code">--enable-threads</code></span></dt><dd><p>This is an abbreviated form of <code class="code">'--enable-threads=yes'</code> + (described next). + </p></dd><dt><span class="term"><code class="code">--enable-threads=OPTION</code></span></dt><dd><p>Select a threading library. A full description is + given in the + general <a class="link" href="http://gcc.gnu.org/install/configure.html">compiler + configuration instructions</a>. This option can change the + library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-time</code></span></dt><dd><p>This is an abbreviated form of + <code class="code">'--enable-libstdcxx-time=yes'</code>(described next). + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-time=OPTION</code></span></dt><dd><p>Enables link-type checks for the availability of the + clock_gettime clocks, used in the implementation of [time.clock], + and of the nanosleep and sched_yield functions, used in the + implementation of [thread.thread.this] of the current C++0x draft. + The choice OPTION=yes checks for the availability of the facilities + in libc and libposix4. In case of need the latter is also linked + to libstdc++ as part of the build process. OPTION=rt also searches + (and, in case, links) librt. Note that the latter is not always + desirable because, in glibc, for example, in turn it triggers the + linking of libpthread too, which activates locking, a large overhead + for single-thread programs. OPTION=no skips the tests completely. + The default is OPTION=no. + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-debug</code></span></dt><dd><p>Build separate debug libraries in addition to what is normally built. + By default, the debug libraries are compiled with + <code class="code"> CXXFLAGS='-g3 -O0 -fno-inline'</code> + , are installed in <code class="code">${libdir}/debug</code>, and have the + same names and versioning information as the non-debug + libraries. This option is off by default. + </p><p>Note this make command, executed in + the build directory, will do much the same thing, without the + configuration difference and without building everything twice: + <code class="code">make CXXFLAGS='-g3 -O0 -fno-inline' all</code> + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-debug-flags=FLAGS</code></span></dt><dd><p>This option is only valid when <code class="code"> --enable-debug </code> + is also specified, and applies to the debug builds only. With + this option, you can pass a specific string of flags to the + compiler to use when building the debug versions of libstdc++. + FLAGS is a quoted string of options, like + </p><pre class="programlisting"> + --enable-libstdcxx-debug-flags='-g3 -O1 -fno-inline'</pre></dd><dt><span class="term"><code class="code">--enable-cxx-flags=FLAGS</code></span></dt><dd><p>With this option, you can pass a string of -f (functionality) + flags to the compiler to use when building libstdc++. This + option can change the library ABI. FLAGS is a quoted string of + options, like + </p><pre class="programlisting"> + --enable-cxx-flags='-fvtable-gc -fomit-frame-pointer -ansi'</pre><p> + Note that the flags don't necessarily have to all be -f flags, + as shown, but usually those are the ones that will make sense + for experimentation and configure-time overriding. + </p><p>The advantage of --enable-cxx-flags over setting CXXFLAGS in + the 'make' environment is that, if files are automatically + rebuilt, the same flags will be used when compiling those files + as well, so that everything matches. + </p><p>Fun flags to try might include combinations of + </p><pre class="programlisting"> + -fstrict-aliasing + -fno-exceptions + -ffunction-sections + -fvtable-gc</pre><p>and opposite forms (-fno-) of the same. Tell us (the libstdc++ + mailing list) if you discover more! + </p></dd><dt><span class="term"><code class="code">--enable-c99</code></span></dt><dd><p>The "long long" type was introduced in C99, along + with many other functions for wide characters, and math + classification macros, etc. If enabled, all C99 functions not + specified by the C++ standard will be put into <code class="code">namespace + __gnu_cxx</code>, and then all these names will + be injected into namespace std, so that C99 functions can be + used "as if" they were in the C++ standard (as they + will eventually be in some future revision of the standard, + without a doubt). By default, C99 support is on, assuming the + configure probes find all the necessary functions and bits + necessary. This option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-wchar_t</code>[default]</span></dt><dd><p>Template specializations for the "wchar_t" type are + required for wide character conversion support. Disabling + wide character specializations may be expedient for initial + porting efforts, but builds only a subset of what is required by + ISO, and is not recommended. By default, this option is on. + This option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-long-long </code></span></dt><dd><p>The "long long" type was introduced in C99. It is + provided as a GNU extension to C++98 in g++. This flag builds + support for "long long" into the library (specialized + templates and the like for iostreams). This option is on by default: + if enabled, users will have to either use the new-style "C" + headers by default (i.e., <cmath> not <math.h>) + or add appropriate compile-time flags to all compile lines to + allow "C" visibility of this feature (on GNU/Linux, + the flag is -D_ISOC99_SOURCE, which is added automatically via + CPLUSPLUS_CPP_SPEC's addition of _GNU_SOURCE). + This option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-fully-dynamic-string</code></span></dt><dd><p>This option enables a special version of basic_string avoiding + the optimization that allocates empty objects in static memory. + Mostly useful together with shared memory allocators, see PR + libstdc++/16612 for details. + </p></dd><dt><span class="term"><code class="code">--enable-concept-checks</code></span></dt><dd><p>This turns on additional compile-time checks for instantiated + library templates, in the form of specialized templates, + <a class="link" href="bk01pt02ch05s02.html" title="Concept Checking">described here</a>. They + can help users discover when they break the rules of the STL, before + their programs run. + </p></dd><dt><span class="term"><code class="code">--enable-symvers[=style]</code></span></dt><dd><p>In 3.1 and later, tries to turn on symbol versioning in the + shared library (if a shared library has been + requested). Values for 'style' that are currently supported + are 'gnu', 'gnu-versioned-namespace', 'darwin', + 'darwin-export', and 'sun'. Both gnu- options require that a recent + version of the GNU linker be in use. Both darwin options are + equivalent. With no style given, the configure script will try + to guess correct defaults for the host system, probe to see if + additional requirements are necessary and present for + activation, and if so, will turn symbol versioning on. This + option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--enable-visibility</code></span></dt><dd><p> In 4.2 and later, enables or disables visibility attributes. + If enabled (as by default), and the compiler seems capable of + passing the simple sanity checks thrown at it, adjusts items + in namespace std, namespace std::tr1, and namespace __gnu_cxx + so that -fvisibility options work. + </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-pch</code></span></dt><dd><p>In 3.4 and later, tries to turn on the generation of + stdc++.h.gch, a pre-compiled file including all the standard + C++ includes. If enabled (as by default), and the compiler + seems capable of passing the simple sanity checks thrown at + it, try to build stdc++.h.gch as part of the make process. + In addition, this generated file is used later on (by appending <code class="code"> + --include bits/stdc++.h </code> to CXXFLAGS) when running the + testsuite. + </p></dd><dt><span class="term"><code class="code">--enable-extern-template</code>[default]</span></dt><dd><p>Use extern template to pre-instantiate all required + specializations for certain types defined in the standard libraries. + These types include <code class="classname">string</code> and dependents like + <code class="classname">char_traits</code>, the templateized io classes, + <code class="classname">allocator</code>, and others. + Disabling means that implicit + template generation will be used when compiling these types. By + default, this option is on. This option can change the library ABI. + </p></dd><dt><span class="term"><code class="code">--disable-hosted-libstdcxx</code></span></dt><dd><p> + By default, a complete <span class="emphasis"><em>hosted</em></span> C++ library is + built. The C++ Standard also describes a + <span class="emphasis"><em>freestanding</em></span> environment, in which only a + minimal set of headers are provided. This option builds such an + environment. + </p></dd></dl></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="setup.html">Prev</a> </td><td align="center"><a accesskey="u" href="setup.html">Up</a></td><td align="right"> <a accesskey="n" href="make.html">Next</a></td></tr><tr><td align="left" valign="top">Chapter 2. Setup </td><td align="center"><a accesskey="h" href="../spine.html">Home</a></td><td align="right" valign="top"> Make</td></tr></table></div></body></html> |