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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 width="20%" align="left"><a accesskey="p" href="setup.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Setup</th><td width="20%" align="right"> <a accesskey="n" href="make.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.setup.configure"></a>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" target="_top">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 class="variablelist"><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="https://www.gnu.org/software/libc/" target="_top">glibc</a>, the GNU C - library), 'generic' to use a generic "C" abstraction which consists - of "C" locale info, 'newlib' to specify the Newlib C library model - which only differs from the 'generic' model in the handling of - ctype, or 'darwin' which omits the <span class="type">wchar_t</span> specializations - needed by the 'generic' model. - </p><p>If not explicitly specified, the configure process 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. On newlib-based - systems (<code class="code">'--with_newlib=yes'</code>) and OpenBSD, 'newlib' is - automatically selected. On Mac OS X 'darwin' 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" target="_top">compiler - configuration instructions</a>. This option can change the - library ABI. - </p></dd><dt><span class="term"><code class="code">--enable-libstdcxx-threads</code></span></dt><dd><p>Enable C++11 threads support. If not explicitly specified, - the configure process enables it if possible. It defaults to 'off' - on Solaris 9, where it would break symbol versioning. 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 2011 ISO C++ standard. - The choice OPTION=yes checks for the availability of the facilities - in libc and libposix4. In case it's needed the latter is also linked - to libstdc++ as part of the build process. OPTION=rt also searches - (and, if needed, 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 <span class="type">long long</span> 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 <span class="type">wchar_t</span> 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 <span class="type">long long</span> 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="concept_checking.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-libstdcxx-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, namespace std::tr2, - and namespace __gnu_cxx to have <code class="code">visibility ("default")</code> - so that -fvisibility options can be used without affecting the - normal external-visibility of namespace std entities. - Prior to 4.7 this option was spelled <code class="code">--enable-visibility</code>. - </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 templatized 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><dt><span class="term"><code class="code">--disable-libstdcxx-verbose</code></span></dt><dd><p> - By default, the library is configured to write descriptive messages - to standard error for certain events such as calling a pure virtual - function or the invocation of the standard terminate handler. Those - messages cause the library to depend on the demangler and standard I/O - facilites, which might be undesirable in a low-memory environment or - when standard error is not available. This option disables those - messages. This option does not change the library ABI. - </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="setup.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="setup.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="make.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. Setup </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Make</td></tr></table></div></body></html>
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