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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 /libstdc++-v3/doc/html/manual/using_macros.html | |
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Diffstat (limited to 'libstdc++-v3/doc/html/manual/using_macros.html')
| -rw-r--r-- | libstdc++-v3/doc/html/manual/using_macros.html | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/libstdc++-v3/doc/html/manual/using_macros.html b/libstdc++-v3/doc/html/manual/using_macros.html new file mode 100644 index 000000000..3e124e909 --- /dev/null +++ b/libstdc++-v3/doc/html/manual/using_macros.html @@ -0,0 +1,77 @@ +<?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>Macros</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , library "/><link rel="home" href="../spine.html" title="The GNU C++ Library"/><link rel="up" href="using.html" title="Chapter 3. Using"/><link rel="prev" href="using_headers.html" title="Headers"/><link rel="next" href="using_namespaces.html" title="Namespaces"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Macros</th></tr><tr><td align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using</th><td align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr></table><hr/></div><div class="section" title="Macros"><div class="titlepage"><div><div><h2 class="title"><a id="manual.intro.using.macros"/>Macros</h2></div></div></div><p> + All library macros begin with <code class="code">_GLIBCXX_</code>. + </p><p> + Furthermore, all pre-processor macros, switches, and + configuration options are gathered in the + file <code class="filename">c++config.h</code>, which + is generated during the libstdc++ configuration and build + process. This file is then included when needed by files part of + the public libstdc++ API, like <ios>. Most of these macros + should not be used by consumers of libstdc++, and are reserved + for internal implementation use. <span class="emphasis"><em>These macros cannot + be redefined</em></span>. + </p><p> + A select handful of macros control libstdc++ extensions and extra + features, or provide versioning information for the API. Only + those macros listed below are offered for consideration by the + general public. + </p><p>Below is the macro which users may check for library version + information. </p><div class="variablelist"><dl><dt><span class="term"><code class="code">__GLIBCXX__</code></span></dt><dd><p>The current version of + libstdc++ in compressed ISO date format, form of an unsigned + long. For details on the value of this particular macro for a + particular release, please consult this <a class="link" href="abi.html" title="ABI Policy and Guidelines"> + document</a>. + </p></dd></dl></div><p>Below are the macros which users may change with #define/#undef or + with -D/-U compiler flags. The default state of the symbol is + listed.</p><p><span class="quote">“<span class="quote">Configurable</span>”</span> (or <span class="quote">“<span class="quote">Not configurable</span>”</span>) means + that the symbol is initially chosen (or not) based on + --enable/--disable options at library build and configure time + (documented <a class="link" href="configure.html" title="Configure">here</a>), with the + various --enable/--disable choices being translated to + #define/#undef). + </p><p> <acronym class="acronym">ABI</acronym> means that changing from the default value may + mean changing the <acronym class="acronym">ABI</acronym> of compiled code. In other words, these + choices control code which has already been compiled (i.e., in a + binary such as libstdc++.a/.so). If you explicitly #define or + #undef these macros, the <span class="emphasis"><em>headers</em></span> may see different code + paths, but the <span class="emphasis"><em>libraries</em></span> which you link against will not. + Experimenting with different values with the expectation of + consistent linkage requires changing the config headers before + building/installing the library. + </p><div class="variablelist"><dl><dt><span class="term"><code class="code">_GLIBCXX_USE_DEPRECATED</code></span></dt><dd><p> + Defined by default. Not configurable. ABI-changing. Turning this off + removes older ARM-style iostreams code, and other anachronisms + from the API. This macro is dependent on the version of the + standard being tracked, and as a result may give different results for + <code class="code">-std=c++98</code> and <code class="code">-std=c++0x</code>. This may + be useful in updating old C++ code which no longer meet the + requirements of the language, or for checking current code + against new language standards. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_FORCE_NEW</code></span></dt><dd><p> + Undefined by default. When defined, memory allocation and + allocators controlled by libstdc++ call operator new/delete + without caching and pooling. Configurable via + <code class="code">--enable-libstdcxx-allocator</code>. ABI-changing. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_CONCEPT_CHECKS</code></span></dt><dd><p> + Undefined by default. Configurable via + <code class="code">--enable-concept-checks</code>. When defined, performs + compile-time checking on certain template instantiations to + detect violations of the requirements of the standard. This + is described in more detail <a class="link" href="ext_compile_checks.html" title="Chapter 16. Compile Time Checks">here</a>. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_DEBUG</code></span></dt><dd><p> + Undefined by default. When defined, compiles user code using + the <a class="link" href="debug_mode.html" title="Chapter 17. Debug Mode">debug mode</a>. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_DEBUG_PEDANTIC</code></span></dt><dd><p> + Undefined by default. When defined while compiling with + the <a class="link" href="debug_mode.html" title="Chapter 17. Debug Mode">debug mode</a>, makes + the debug mode extremely picky by making the use of libstdc++ + extensions and libstdc++-specific behavior into errors. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_PARALLEL</code></span></dt><dd><p>Undefined by default. When defined, compiles user code + using the <a class="link" href="parallel_mode.html" title="Chapter 18. Parallel Mode">parallel + mode</a>. + </p></dd><dt><span class="term"><code class="code">_GLIBCXX_PROFILE</code></span></dt><dd><p>Undefined by default. When defined, compiles user code + using the <a class="link" href="profile_mode.html" title="Chapter 19. Profile Mode">profile + mode</a>. + </p></dd></dl></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><td align="center"><a accesskey="u" href="using.html">Up</a></td><td align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr><tr><td align="left" valign="top">Headers </td><td align="center"><a accesskey="h" href="../spine.html">Home</a></td><td align="right" valign="top"> Namespaces</td></tr></table></div></body></html> |