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-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Macros</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.77.1" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.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 width="20%" align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Using</th><td width="20%" align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.using.macros"></a>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 &lt;ios&gt;. 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 class="variablelist"><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 class="variablelist"><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++11</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_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 width="40%" align="left"><a accesskey="p" href="using_headers.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="using.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="using_namespaces.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Headers </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Namespaces</td></tr></table></div></body></html> \ No newline at end of file