mirror of git://gcc.gnu.org/git/gcc.git
448 lines
20 KiB
XML
448 lines
20 KiB
XML
<section xmlns="http://docbook.org/ns/docbook" version="5.0"
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xml:id="manual.intro.setup.configure" xreflabel="Configuring">
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<?dbhtml filename="configure.html"?>
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<info><title>Configure</title>
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<keywordset>
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<keyword>ISO C++</keyword>
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<keyword>configure</keyword>
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<keyword>options</keyword>
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</keywordset>
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</info>
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<para>
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When configuring libstdc++, you'll have to configure the entire
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<emphasis>gccsrcdir</emphasis> directory. Consider using the
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toplevel gcc configuration option
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<literal>--enable-languages=c++</literal>, which saves time by only
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building the C++ toolchain.
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</para>
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<para>
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Here are all of the configure options specific to libstdc++. Keep
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in mind that
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<!-- This SECnn should be the "Choosing Package Options" section. -->
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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://sourceware.org/autobook/autobook/autobook_14.html">they
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all have opposite forms as well</link> (enable/disable and
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with/without). The defaults are for the <emphasis>current
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development sources</emphasis>, which may be different than those
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for released versions.
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</para>
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<para>The canonical way to find out the configure options that are
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available for a given set of libstdc++ sources is to go to the
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source directory and then type: <command>./configure --help</command>.
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</para>
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<variablelist>
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<varlistentry><term><code>--enable-multilib</code>[default]</term>
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<listitem><para>This is part of the generic multilib support for building cross
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compilers. As such, targets like "powerpc-elf" will have
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libstdc++ built many different ways: "-msoft-float"
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and not, etc. A different libstdc++ will be built for each of
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the different multilib versions. This option is on by default.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-version-specific-runtime-libs</code></term>
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<listitem><para>Specify that run-time libraries should be installed in the
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compiler-specific subdirectory (i.e.,
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<code>${libdir}/gcc-lib/${target_alias}/${gcc_version}</code>)
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instead of <code>${libdir}</code>. This option is useful if you
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intend to use several versions of gcc in parallel. In addition,
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libstdc++'s include files will be installed in
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<code>${libdir}/gcc-lib/${target_alias}/${gcc_version}/include/g++</code>,
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unless you also specify
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<literal>--with-gxx-include-dir=</literal><filename class="directory">dirname</filename> during configuration.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--with-gxx-include-dir=<include-files dir></code></term>
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<listitem><para>Adds support for named libstdc++ include directory. For instance,
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the following puts all the libstdc++ headers into a directory
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called "4.4-20090404" instead of the usual
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"c++/(version)".
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</para>
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<programlisting>
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--with-gxx-include-dir=/foo/H-x86-gcc-3-c-gxx-inc/include/4.4-20090404</programlisting> </listitem></varlistentry>
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<varlistentry><term><code>--enable-cstdio</code></term>
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<listitem><para>This is an abbreviated form of <code>'--enable-cstdio=stdio'</code>
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(described next).
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-cstdio=OPTION</code></term>
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<listitem><para>Select a target-specific I/O package. At the moment, the only
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choice is to use 'stdio', a generic "C" abstraction.
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The default is 'stdio'. This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-clocale</code></term>
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<listitem><para>This is an abbreviated form of <code>'--enable-clocale=generic'</code>
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(described next).
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-clocale=OPTION</code></term>
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<listitem><para>Select a target-specific underlying locale package. The
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choices are 'ieee_1003.1-2001' to specify an X/Open, Standard Unix
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(IEEE Std. 1003.1-2001) model based on langinfo/iconv/catgets,
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'gnu' to specify a model based on functionality from the GNU C
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library (langinfo/iconv/gettext) (from <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://www.gnu.org/software/libc/">glibc</link>, the GNU C
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library), 'generic' to use a generic "C" abstraction which consists
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of "C" locale info, 'newlib' to specify the Newlib C library model
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which only differs from the 'generic' model in the handling of
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ctype, or 'darwin' which omits the <type>wchar_t</type> specializations
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needed by the 'generic' model.
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</para>
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<para>If not explicitly specified, the configure process tries
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to guess the most suitable package from the choices above. The
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default is 'generic'. On glibc-based systems of sufficient
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vintage (2.3 and newer), 'gnu' is automatically selected. On newlib-based
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systems (<code>'--with_newlib=yes'</code>) and OpenBSD, 'newlib' is
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automatically selected. On Mac OS X 'darwin' is automatically selected.
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This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-allocator</code></term>
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<listitem><para>This is an abbreviated form of
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<code>'--enable-libstdcxx-allocator=auto'</code> (described
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next).
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-allocator=OPTION </code></term>
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<listitem><para>Select a target-specific underlying std::allocator. The
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choices are 'new' to specify a wrapper for new, 'malloc' to
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specify a wrapper for malloc, 'mt' for a fixed power of two allocator,
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'pool' for the SGI pooled allocator or 'bitmap' for a bitmap allocator.
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See this page for more information on allocator
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<link linkend="allocator.ext">extensions</link>. This option
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can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-cheaders=OPTION</code></term>
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<listitem><para>This allows the user to define the approach taken for C header
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compatibility with C++. Options are c, c_std, and c_global.
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These correspond to the source directory's include/c,
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include/c_std, and include/c_global, and may also include
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include/c_compatibility. The default is 'c_global'.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-threads</code></term>
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<listitem><para>This is an abbreviated form of <code>'--enable-threads=yes'</code>
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(described next).
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-threads=OPTION</code></term>
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<listitem><para>Select a threading library. A full description is
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given in the
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general <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://gcc.gnu.org/install/configure.html">compiler
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configuration instructions</link>. This option can change the
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library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-threads</code></term>
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<listitem><para>Enable C++11 threads support. If not explicitly specified,
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the configure process enables it if possible. This
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option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-time</code></term>
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<listitem><para>This is an abbreviated form of
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<code>'--enable-libstdcxx-time=yes'</code>(described next).
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-time=OPTION</code></term>
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<listitem><para>Enables link-type checks for the availability of the
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clock_gettime clocks, used in the implementation of [time.clock],
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and of the nanosleep and sched_yield functions, used in the
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implementation of [thread.thread.this] of the 2011 ISO C++ standard.
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The choice OPTION=yes checks for the availability of the facilities
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in libc and libposix4. In case it's needed the latter is also linked
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to libstdc++ as part of the build process. OPTION=rt also searches
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(and, if needed, links) librt. Note that the latter is not always
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desirable because, in glibc, for example, in turn it triggers the
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linking of libpthread too, which activates locking, a large overhead
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for single-thread programs. OPTION=no skips the tests completely.
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The default is OPTION=auto, which skips the checks and enables the
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features only for targets known to support them.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-debug</code></term>
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<listitem><para>Build separate debug libraries in addition to what is normally built.
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By default, the debug libraries are compiled with
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<code> CXXFLAGS='-g3 -O0 -fno-inline'</code>
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, are installed in <code>${libdir}/debug</code>, and have the
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same names and versioning information as the non-debug
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libraries. This option is off by default.
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</para>
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<para>Note this make command, executed in
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the build directory, will do much the same thing, without the
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configuration difference and without building everything twice:
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<code>make CXXFLAGS='-g3 -O0 -fno-inline' all</code>
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-debug-flags=FLAGS</code></term>
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<listitem><para>This option is only valid when <code> --enable-debug </code>
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is also specified, and applies to the debug builds only. With
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this option, you can pass a specific string of flags to the
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compiler to use when building the debug versions of libstdc++.
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FLAGS is a quoted string of options, like
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</para>
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<programlisting>
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--enable-libstdcxx-debug-flags='-g3 -O1 -fno-inline'</programlisting>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-cxx-flags=FLAGS</code></term>
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<listitem><para>With this option, you can pass a string of -f (functionality)
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flags to the compiler to use when building libstdc++. This
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option can change the library ABI. FLAGS is a quoted string of
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options, like
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</para>
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<programlisting>
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--enable-cxx-flags='-fvtable-gc -fomit-frame-pointer -ansi'</programlisting>
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<para>
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Note that the flags don't necessarily have to all be -f flags,
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as shown, but usually those are the ones that will make sense
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for experimentation and configure-time overriding.
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</para>
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<para>The advantage of --enable-cxx-flags over setting CXXFLAGS in
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the 'make' environment is that, if files are automatically
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rebuilt, the same flags will be used when compiling those files
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as well, so that everything matches.
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</para>
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<para>Fun flags to try might include combinations of
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</para>
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<programlisting>
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-fstrict-aliasing
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-fno-exceptions
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-ffunction-sections
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-fvtable-gc</programlisting>
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<para>and opposite forms (-fno-) of the same. Tell us (the libstdc++
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mailing list) if you discover more!
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-c99</code></term>
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<listitem><para>The <type>long long</type> type was introduced in C99, along
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with many other functions for wide characters, and math
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classification macros, etc. If enabled, all C99 functions not
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specified by the C++ standard will be put into <code>namespace
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__gnu_cxx</code>, and then all these names will
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be injected into namespace std, so that C99 functions can be
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used "as if" they were in the C++ standard (as they
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will eventually be in some future revision of the standard,
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without a doubt). By default, C99 support is on, assuming the
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configure probes find all the necessary functions and bits
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necessary. This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-wchar_t</code>[default]</term>
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<listitem><para>Template specializations for the <type>wchar_t</type> type are
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required for wide character conversion support. Disabling
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wide character specializations may be expedient for initial
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porting efforts, but builds only a subset of what is required by
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ISO, and is not recommended. By default, this option is on.
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This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-long-long </code></term>
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<listitem><para>The <type>long long</type> type was introduced in C99. It is
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provided as a GNU extension to C++98 in g++. This flag builds
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support for "long long" into the library (specialized
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templates and the like for iostreams). This option is on by default:
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if enabled, users will have to either use the new-style "C"
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headers by default (i.e., <cmath> not <math.h>)
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or add appropriate compile-time flags to all compile lines to
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allow "C" visibility of this feature (on GNU/Linux,
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the flag is -D_ISOC99_SOURCE, which is added automatically via
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CPLUSPLUS_CPP_SPEC's addition of _GNU_SOURCE).
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This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-fully-dynamic-string</code></term>
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<listitem><para>This option enables a special version of basic_string avoiding
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the optimization that allocates empty objects in static memory.
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Mostly useful together with shared memory allocators, see PR
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libstdc++/16612 for details.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-concept-checks</code></term>
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<listitem><para>This turns on additional compile-time checks for instantiated
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library templates, in the form of specialized templates described in
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the <link linkend="std.diagnostics.concept_checking">Concept
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Checking</link> section. They
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can help users discover when they break the rules of the STL, before
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their programs run. These checks are based on C++03 rules and some of
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them are not compatible with correct C++11 code.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-symvers[=style]</code></term>
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<listitem><para>In 3.1 and later, tries to turn on symbol versioning in the
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shared library (if a shared library has been
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requested). Values for 'style' that are currently supported
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are 'gnu', 'gnu-versioned-namespace', 'darwin',
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'darwin-export', and 'sun'. Both gnu- options require that a recent
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version of the GNU linker be in use. Both darwin options are
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equivalent. With no style given, the configure script will try
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to guess correct defaults for the host system, probe to see if
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additional requirements are necessary and present for
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activation, and if so, will turn symbol versioning on. This
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option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-visibility</code></term>
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<listitem><para> In 4.2 and later, enables or disables visibility
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attributes. If enabled (as by default), and the compiler seems
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capable of passing the simple sanity checks thrown at it, adjusts
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items in namespace std, namespace std::tr1, namespace std::tr2,
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and namespace __gnu_cxx to have <code>visibility ("default")</code>
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so that -fvisibility options can be used without affecting the
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normal external-visibility of namespace std entities.
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Prior to 4.7 this option was spelled <code>--enable-visibility</code>.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-libstdcxx-pch</code></term>
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<listitem><para>In 3.4 and later, tries to turn on the generation of
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stdc++.h.gch, a pre-compiled file including all the standard
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C++ includes. If enabled (as by default), and the compiler
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seems capable of passing the simple sanity checks thrown at
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it, try to build stdc++.h.gch as part of the make process.
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In addition, this generated file is used later on (by appending <code>
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--include bits/stdc++.h </code> to CXXFLAGS) when running the
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testsuite.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--enable-extern-template</code>[default]</term>
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<listitem><para>Use extern template to pre-instantiate all required
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specializations for certain types defined in the standard libraries.
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These types include <classname>string</classname> and dependents like
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<classname>char_traits</classname>, the templatized IO classes,
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<classname>allocator</classname>, and others.
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Disabling means that implicit
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template generation will be used when compiling these types. By
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default, this option is on. This option can change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--disable-hosted-libstdcxx</code></term>
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<listitem>
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<para>
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By default, a complete <emphasis>hosted</emphasis> C++ library is
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built. The C++ Standard also describes a
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<emphasis>freestanding</emphasis> environment, in which only a
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minimal set of headers are provided. This option builds such an
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environment.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--disable-libstdcxx-verbose</code></term>
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<listitem>
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<para>
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By default, the library is configured to write descriptive messages
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to standard error for certain events such as calling a pure virtual
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function or the invocation of the standard terminate handler. Those
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messages cause the library to depend on the demangler and standard I/O
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facilities, which might be undesirable in a low-memory environment or
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when standard error is not available. This option disables those
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messages. This option does not change the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--disable-libstdcxx-dual-abi</code></term>
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<listitem>
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<para>
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Disable support for the new, C++11-conforming implementations of
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<code>std::string</code>, <code>std::list</code> etc. so that the
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library only provides definitions of types using the old ABI
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(see <xref linkend="manual.intro.using.abi"/>).
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This option changes the library ABI.
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</para>
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</listitem></varlistentry>
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<varlistentry><term><code>--with-default-libstdcxx-abi=</code><replaceable>OPTION</replaceable></term>
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<listitem>
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<para>
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Set the default value for the <symbol>_GLIBCXX_USE_CXX11_ABI</symbol>
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macro (see <xref linkend="manual.intro.using.macros"/>).
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The default is <option>OPTION=new</option> which sets the macro to
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<literal>1</literal>,
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use <option>OPTION=gcc4-compatible</option> to set it to
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<literal>0</literal>.
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This option does not change the library ABI.
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</para>
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</listitem></varlistentry>
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|
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<varlistentry><term><code>--with-libstdcxx-lock-policy=OPTION</code></term>
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<listitem><para>Sets the lock policy that controls how
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<classname>shared_ptr</classname> reference counting is
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synchronized.
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The choice OPTION=atomic enables use of atomics for updates to
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<classname>shared_ptr</classname> reference counts.
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The choice OPTION=mutex enables use of a mutex to synchronize updates
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to <classname>shared_ptr</classname> reference counts.
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If the compiler's thread model is "single" then this option has no
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effect, as no synchronization is used for the reference counts.
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The default is OPTION=auto, which checks for the availability of
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compiler built-ins for 2-byte and 4-byte atomic compare-and-swap,
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and uses OPTION=atomic if they're available, OPTION=mutex otherwise.
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This option can change the library ABI.
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If the library is configured to use atomics and user programs are
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compiled using a target that doesn't natively support the atomic
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operations (e.g. the library is configured for armv7 and then code
|
|
is compiled with <option>-march=armv5t</option>) then the program
|
|
might rely on support in libgcc to provide the atomics.
|
|
</para>
|
|
</listitem></varlistentry>
|
|
|
|
<varlistentry><term><code>--enable-vtable-verify</code>[default]</term>
|
|
<listitem>
|
|
<para>Use <code>-fvtable-verify=std</code> to compile the C++
|
|
runtime with instrumentation for vtable verification. All virtual
|
|
functions in the standard library will be verified at runtime.
|
|
Types impacted include <classname>locale</classname> and
|
|
<classname>iostream</classname>, and others. Disabling means that
|
|
the C++ runtime is compiled without support for vtable
|
|
verification. By default, this option is off.
|
|
</para>
|
|
</listitem></varlistentry>
|
|
|
|
<varlistentry><term><code>--enable-libstdcxx-filesystem-ts</code>[default]</term>
|
|
<listitem>
|
|
<para>Build <filename class="libraryfile">libstdc++fs.a</filename> as well
|
|
as the usual libstdc++ and libsupc++ libraries. This is enabled by
|
|
default on select POSIX targets where it is known to work and disabled
|
|
otherwise.
|
|
</para>
|
|
</listitem></varlistentry>
|
|
|
|
</variablelist>
|
|
|
|
</section>
|