gcc/libstdc++-v3/doc/html/manual/configure.html - Issue 3050029: [gcc] GCC 4.5.0=>4.5.1

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Issue 3050029: [gcc] GCC 4.5.0=>4.5.1 (Closed) Base URL: ssh://git@gitrw.chromium.org:9222/nacl-toolchain.git

Patch Set: Created 10 years, 5 months ago

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Index: gcc/libstdc++-v3/doc/html/manual/configure.html

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-<!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>Configure</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content="
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 " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><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 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="sect1" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.setup.configure"></a>Configure</h2></div></div></div>

- When configuring libstdc++, you'll have to configure the entire

- gccsrcdir directory. Consider using the

- toplevel gcc configuration option

- <code class="literal">--enable-languages=c++</code>, which saves time by only

- building the C++ toolchain.

-

- Here are all of the configure options specific to libstdc++. Keep

- in mind that

- <a class="ulink" href="http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_node/autoconf_131.html#SEC131" target="_top">they

- all have opposite forms as well</a> (enable/disable and

- with/without). The defaults are for the current

- development sources, which may be different than those

- for released versions.

-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:./configure --help.

-<div class="variablelist"><dl><dt><code class="code">--enable-multilib</code>[default]</dt><dd>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.

- </dd><dt><code class="code">--enable-sjlj-exceptions</code></dt><dd>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.

- </dd><dt><code class="code">--enable-version-specific-runtime-libs</code></dt><dd>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 class="filename">dirname</code></code> during configuration.

- </dd><dt><code class="code">--with-gxx-include-dir=<include-files dir></code></dt><dd>Adds support for named libstdc++ include directory. For instance,

- the following puts all the libstdc++ headers into a directory

- called "2.97-20001008" instead of the usual

- "c++/(version)".

- <pre class="programlisting">

- --with-gxx-include-dir=/foo/H-x86-gcc-3-c-gxx-inc/include/2.97-20001008</pre></dd><dt><code class="code">--enable-cstdio</code></dt><dd>This is an abbreviated form of <code class="code">'--enable-cstdio=stdio'</code>

- (described next). This option can change the library ABI.

- </dd><dt><code class="code">--enable-cstdio=OPTION</code></dt><dd>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'.

- </dd><dt><code class="code">--enable-clocale</code></dt><dd>This is an abbreviated form of <code class="code">'--enable-clocale=generic'</code>

- (described next). This option can change the library ABI.

- </dd><dt><code class="code">--enable-clocale=OPTION</code></dt><dd>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="ulink" href="http://sources.redhat.com/glibc/" target="_top">glibc</a>, the GNU C

- library), or 'generic' to use a generic "C"

- abstraction which consists of "C" locale info.

- As part of the configuration process, the "C" library is

- probed both for sufficient vintage, and installed locale

- data. If either of these elements are not present, the C++

- locale model default to 'generic.' On glibc-based systems of

- version 2.2.5 and above with installed locale files, 'gnu' is

- automatically selected.

- </dd><dt><code class="code">--enable-libstdcxx-allocator</code></dt><dd>This is an abbreviated form of

- <code class="code">'--enable-libstdcxx-allocator=auto'</code> (described

- next). This option can change the library ABI.

- </dd><dt><code class="code">--enable-libstdcxx-allocator=OPTION </code></dt><dd>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.

- This option can change the library ABI. See this page for more information on allocator

- <a class="link" href="memory.html#allocator.ext" title="Extension Allocators">extensions</a>

- </dd><dt><code class="code">--enable-cheaders=OPTION</code></dt><dd>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.

- </dd><dt><code class="code">--enable-threads</code></dt><dd>This is an abbreviated form of <code class="code">'--enable-threads=yes'</code>

- (described next). This option can change the library ABI.

- </dd><dt><code class="code">--enable-threads=OPTION</code></dt><dd>Select a threading library. A full description is given in the

- general <a class="ulink" href="http://gcc.gnu.org/install/configure.html" target="_top">compiler

- configuration instructions</a>.

- </dd><dt><code class="code">--enable-libstdcxx-debug</code></dt><dd>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.

- 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>

- </dd><dt><code class="code">--enable-libstdcxx-debug-flags=FLAGS</code></dt><dd>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

- <pre class="programlisting">

- --enable-libstdcxx-debug-flags='-g3 -O1 -fno-inline'</pre></dd><dt><code class="code">--enable-cxx-flags=FLAGS</code></dt><dd>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

- <pre class="programlisting">

- --enable-cxx-flags='-fvtable-gc -fomit-frame-pointer -ansi'</pre>

- 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.

- 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.

- Fun flags to try might include combinations of

- <pre class="programlisting">

- -fstrict-aliasing

- -fno-exceptions

- -ffunction-sections

- -fvtable-gc</pre>and opposite forms (-fno-) of the same. Tell us (the libstdc++

- mailing list) if you discover more!

- </dd><dt><code class="code">--enable-c99</code></dt><dd>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.

- </dd><dt><code class="code">--enable-wchar_t</code>[default]</dt><dd>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.

- </dd><dt><code class="code">--enable-long-long </code></dt><dd>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.

- </dd><dt><code class="code">--enable-fully-dynamic-string</code></dt><dd>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.

- </dd><dt><code class="code">--enable-concept-checks</code></dt><dd>This turns on additional compile-time checks for instantiated

- library templates, in the form of specialized templates,

- <a class="link" href="bk01pt03ch08.html" title="Chapter 8. Concept Checking">described here</a>. They

- can help users discover when they break the rules of the STL, before

- their programs run.

- </dd><dt><code class="code">--enable-symvers[=style]</code></dt><dd>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', and

- 'darwin-export'. 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.

- </dd><dt><code class="code">--enable-visibility</code></dt><dd> 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.

- </dd><dt><code class="code">--enable-libstdcxx-pch</code></dt><dd>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.

- </dd><dt><code class="code">--disable-hosted-libstdcxx</code></dt><dd>

- By default, a complete hosted C++ library is

- built. The C++ Standard also describes a

- freestanding environment, in which only a

- minimal set of headers are provided. This option builds such an

- environment.

- </dd><dt><code class="code">--enable-clock-gettime</code></dt><dd>This is an abbreviated form of

- <code class="code">'--enable-clock-gettime=yes'</code>(described next).

- </dd><dt><code class="code">--enable-libstdcxx-time=OPTION</code></dt><dd>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.

- </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="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Make</td></tr></table></div></body></html>

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