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-<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-NS Stylesheets V1.76.1" /><meta name="keywords" content=" ISO C++ , configure , options " /><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="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="section" title="Configure"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="manual.intro.setup.configure"></a>Configure</h2></div></div></div><p>
+<!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-NS Stylesheets V1.77.1" /><meta name="keywords" content="ISO C++, configure, options" /><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="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="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
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><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
+ 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
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="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.
- </p><p>If not explicitly specified, the configure proccess tries
+ 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. This option
- can change the library ABI.
+ 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).
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 8 and 9, where it would break symbol versioning. This
+ 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).
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 of need the latter is also linked
+ 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, in case, links) librt. Note that the latter is not always
+ (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.
-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 "long long" type was introduced in C99, along
+ </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
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 "wchar_t" type are
+ </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 "long long" type was introduced in C99. It is
+ </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:
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="bk01pt02ch05s02.html" title="Concept Checking">described here</a>. They
+ <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
</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 templateized io classes,
+ <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
<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></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>
+ </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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