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2008, 2010
- <a class="link" href="http://www.fsf.org">FSF</a>
- </p></div></div><hr/></div><div class="qandaset" title="Frequently Asked Questions"><a id="id
396973"/><dl><dt/><dd><dl><dt>1.1. <a href="faq.html#faq.what">
+ <a class="link" href="http://www.fsf.org" target="">FSF</a>
+ </p></div></div><hr/></div><div class="qandaset" title="Frequently Asked Questions"><a id="id
533065"/><dl><dt/><dd><dl><dt>1.1. <a href="faq.html#faq.what">
What is libstdc++?
</a></dt><dt>1.2. <a href="faq.html#faq.why">
Why should I use libstdc++?
What happened to the older libg++? I need that!
</a></dt><dt>1.7. <a href="faq.html#faq.more_questions">
What if I have more questions?
- </a></dt></dl></td></tr><tr class="question" title="1.1."><td align="left" valign="top"><a id="faq.what"/><a id="faq.what.q"/><p><
strong>1.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="1.1."><td align="left" valign="top"><a id="faq.what"/><a id="faq.what.q"/><p><
b>1.1.</b></p></td><td align="left" valign="top"><p>
What is libstdc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="faq.what.a"/></td><td align="left" valign="top"><p>
The GNU Standard C++ Library v3 is an ongoing project to
exactly how far the project has come, or just want the latest
bleeding-edge code, the up-to-date source is available over
anonymous SVN, and can even be browsed over
- the <a class="link" href="http://gcc.gnu.org/svn.html">web</a>.
- </p></td></tr><tr class="question" title="1.2."><td align="left" valign="top"><a id="faq.why"/><a id="q-why"/><p><
strong>1.2.</strong></p></td><td align="left" valign="top"><p>
+ the <a class="link" href="http://gcc.gnu.org/svn.html" target="">web</a>.
+ </p></td></tr><tr class="question" title="1.2."><td align="left" valign="top"><a id="faq.why"/><a id="q-why"/><p><
b>1.2.</b></p></td><td align="left" valign="top"><p>
Why should I use libstdc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-why"/></td><td align="left" valign="top"><p>
The completion of the ISO C++ standardization gave the C++
(<span class="command"><strong>gcc</strong></span>, <span class="command"><strong>g++</strong></span>, etc) is widely
considered to be one of the leading compilers in the world. Its
development is overseen by the
- <a class="link" href="http://gcc.gnu.org/">GCC team</a>. All of
+ <a class="link" href="http://gcc.gnu.org/" target="">GCC team</a>. All of
the rapid development and near-legendary
- <a class="link" href="http://gcc.gnu.org/buildstat.html">portability</a>
+ <a class="link" href="http://gcc.gnu.org/buildstat.html" target="">portability</a>
that are the hallmarks of an open-source project are being
applied to libstdc++.
</p><p>
<code class="classname">vector<></code>, iostreams, and algorithms.)
Programmers will no longer need to <span class="quote">“<span class="quote">roll their own</span>”</span>
nor be worried about platform-specific incompatibilities.
- </p></td></tr><tr class="question" title="1.3."><td align="left" valign="top"><a id="faq.who"/><a id="q-who"/><p><
strong>1.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="1.3."><td align="left" valign="top"><a id="faq.who"/><a id="q-who"/><p><
b>1.3.</b></p></td><td align="left" valign="top"><p>
Who's in charge of it?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-who"/></td><td align="left" valign="top"><p>
The libstdc++ project is contributed to by several developers
Development and discussion is held on the libstdc++ mailing
list. Subscribing to the list, or searching the list
archives, is open to everyone. You can read instructions for
- doing so on the <a class="link" href="http://gcc.gnu.org/libstdc++/">homepage</a>.
+ doing so on the <a class="link" href="http://gcc.gnu.org/libstdc++/" target="">homepage</a>.
If you have questions, ideas, code, or are just curious, sign up!
- </p></td></tr><tr class="question" title="1.4."><td align="left" valign="top"><a id="faq.when"/><a id="q-when"/><p><
strong>1.4.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="1.4."><td align="left" valign="top"><a id="faq.when"/><a id="q-when"/><p><
b>1.4.</b></p></td><td align="left" valign="top"><p>
When is libstdc++ going to be finished?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-when"/></td><td align="left" valign="top"><p>
Nathan Myers gave the best of all possible answers, responding to
a Usenet article asking this question: <span class="emphasis"><em>Sooner, if you
help.</em></span>
- </p></td></tr><tr class="question" title="1.5."><td align="left" valign="top"><a id="faq.how"/><a id="q-how"/><p><
strong>1.5.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="1.5."><td align="left" valign="top"><a id="faq.how"/><a id="q-how"/><p><
b>1.5.</b></p></td><td align="left" valign="top"><p>
How do I contribute to the effort?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-how"/></td><td align="left" valign="top"><p>
Here is <a class="link" href="manual/appendix_contributing.html" title="Appendix A. Contributing">a page devoted to
anybody who is willing to help write documentation, for example,
or has found a bug in code that we all thought was working and is
willing to provide details, is more than welcome!
- </p></td></tr><tr class="question" title="1.6."><td align="left" valign="top"><a id="faq.whereis_old"/><a id="q-whereis_old"/><p><
strong>1.6.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="1.6."><td align="left" valign="top"><a id="faq.whereis_old"/><a id="q-whereis_old"/><p><
b>1.6.</b></p></td><td align="left" valign="top"><p>
What happened to the older libg++? I need that!
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-whereis_old"/></td><td align="left" valign="top"><p>
The most recent libg++ README states that libg++ is no longer
projects, and is only being kicked along to support older code.
</p><p>
More information in the <a class="link" href="manual/backwards.html" title="Backwards Compatibility">backwards compatibility documentation</a>
- </p></td></tr><tr class="question" title="1.7."><td align="left" valign="top"><a id="faq.more_questions"/><a id="q-more_questions"/><p><
strong>1.7.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="1.7."><td align="left" valign="top"><a id="faq.more_questions"/><a id="q-more_questions"/><p><
b>1.7.</b></p></td><td align="left" valign="top"><p>
What if I have more questions?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-more_questions"/></td><td align="left" valign="top"><p>
If you have read the README file, and your question remains
How is that different from the GNU {Lesser,Library} GPL?
</a></dt><dt>2.4. <a href="faq.html#faq.license.what_restrictions">
I see. So, what restrictions are there on programs that use the library?
- </a></dt></dl></td></tr><tr class="question" title="2.1."><td align="left" valign="top"><a id="faq.license.what"/><a id="q-license.what"/><p><
strong>2.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="2.1."><td align="left" valign="top"><a id="faq.license.what"/><a id="q-license.what"/><p><
b>2.1.</b></p></td><td align="left" valign="top"><p>
What are the license terms for libstdc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-license.what"/></td><td align="left" valign="top"><p>
See <a class="link" href="manual/license.html" title="License">our license description</a>
for these and related questions.
- </p></td></tr><tr class="question" title="2.2."><td align="left" valign="top"><a id="faq.license.any_program"/><a id="q-license.any_program"/><p><
strong>2.2.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="2.2."><td align="left" valign="top"><a id="faq.license.any_program"/><a id="q-license.any_program"/><p><
b>2.2.</b></p></td><td align="left" valign="top"><p>
So any program which uses libstdc++ falls under the GPL?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-license.any_program"/></td><td align="left" valign="top"><p>
No. The special exception permits use of the library in
proprietary applications.
- </p></td></tr><tr class="question" title="2.3."><td align="left" valign="top"><a id="faq.license.lgpl"/><a id="q-license.lgpl"/><p><
strong>2.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="2.3."><td align="left" valign="top"><a id="faq.license.lgpl"/><a id="q-license.lgpl"/><p><
b>2.3.</b></p></td><td align="left" valign="top"><p>
How is that different from the GNU {Lesser,Library} GPL?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-license.lgpl"/></td><td align="left" valign="top"><p>
The LGPL requires that users be able to replace the LGPL code with a
are expanded inside the code that uses the library. So to allow people
to replace the library code, someone using the library would have to
distribute their own source, rendering the LGPL equivalent to the GPL.
- </p></td></tr><tr class="question" title="2.4."><td align="left" valign="top"><a id="faq.license.what_restrictions"/><a id="q-license.what_restrictions"/><p><
strong>2.4.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="2.4."><td align="left" valign="top"><a id="faq.license.what_restrictions"/><a id="q-license.what_restrictions"/><p><
b>2.4.</b></p></td><td align="left" valign="top"><p>
I see. So, what restrictions are there on programs that use the library?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-license.what_restrictions"/></td><td align="left" valign="top"><p>
None. We encourage such programs to be released as open source,
What's libsupc++?
</a></dt><dt>3.6. <a href="faq.html#faq.size">
This library is HUGE!
- </a></dt></dl></td></tr><tr class="question" title="3.1."><td align="left" valign="top"><a id="faq.how_to_install"/><a id="q-how_to_install"/><p><
strong>3.1.</strong></p></td><td align="left" valign="top"><p>How do I install libstdc++?
+ </a></dt></dl></td></tr><tr class="question" title="3.1."><td align="left" valign="top"><a id="faq.how_to_install"/><a id="q-how_to_install"/><p><
b>3.1.</b></p></td><td align="left" valign="top"><p>How do I install libstdc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-how_to_install"/></td><td align="left" valign="top"><p>
Often libstdc++ comes pre-installed as an integral part of many
existing Linux and Unix systems, as well as many embedded
documentation</a> for detailed
instructions. You may wish to browse those files ahead
of time to get a feel for what's required.
- </p></td></tr><tr class="question" title="3.2."><td align="left" valign="top"><a id="faq.how_to_get_sources"/><a id="q-how_to_get_sources"/><p><
strong>3.2.</strong></p></td><td align="left" valign="top"><p>How does one get current libstdc++ sources?
+ </p></td></tr><tr class="question" title="3.2."><td align="left" valign="top"><a id="faq.how_to_get_sources"/><a id="q-how_to_get_sources"/><p><
b>3.2.</b></p></td><td align="left" valign="top"><p>How does one get current libstdc++ sources?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-how_to_get_sources"/></td><td align="left" valign="top"><p>
Libstdc++ sources for all official releases can be obtained as
part of the GCC sources, available from various sites and
- mirrors. A full <a class="link" href="http://gcc.gnu.org/mirrors.html">list of
+ mirrors. A full <a class="link" href="http://gcc.gnu.org/mirrors.html" target="">list of
download sites</a> is provided on the main GCC site.
</p><p>
Current libstdc++ sources can always be checked out of the main
<span class="application">Subversion</span>, or <acronym class="acronym">SVN</acronym>, is
one of several revision control packages. It was selected for GNU
projects because it's free (speech), free (beer), and very high
- quality. The <a class="link" href="http://subversion.tigris.org"> Subversion
+ quality. The <a class="link" href="http://subversion.tigris.org" target=""> Subversion
home page</a> has a better description.
</p><p>
The <span class="quote">“<span class="quote">anonymous client checkout</span>”</span> feature of SVN is
the latest libstdc++ sources.
</p><p>
For more information
- see <a class="link" href="http://gcc.gnu.org/svn.html"><acronym class="acronym">SVN</acronym>
+ see <a class="link" href="http://gcc.gnu.org/svn.html"
target=""><acronym class="acronym">SVN</acronym>
details</a>.
- </p></td></tr><tr class="question" title="3.3."><td align="left" valign="top"><a id="faq.how_to_test"/><a id="q-how_to_test"/><p><
strong>3.3.</strong></p></td><td align="left" valign="top"><p>How do I know if it works?
+ </p></td></tr><tr class="question" title="3.3."><td align="left" valign="top"><a id="faq.how_to_test"/><a id="q-how_to_test"/><p><
b>3.3.</b></p></td><td align="left" valign="top"><p>How do I know if it works?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-how_to_test"/></td><td align="left" valign="top"><p>
Libstdc++ comes with its own validation testsuite, which includes
conformance testing, regression testing, ABI testing, and
performance testing. Please consult the
- <a class="link" href="http://gcc.gnu.org/install/test.html">testing
+ <a class="link" href="http://gcc.gnu.org/install/test.html" target="">testing
documentation</a> for more details.
</p><p>
If you find bugs in the testsuite programs themselves, or if you
think of a new test program that should be added to the suite,
<span class="emphasis"><em>please</em></span> write up your idea and send it to the list!
- </p></td></tr><tr class="question" title="3.4."><td align="left" valign="top"><a id="faq.how_to_set_paths"/><a id="q-how_to_set_paths"/><p><
strong>3.4.</strong></p></td><td align="left" valign="top"><p>How do I insure that the dynamically linked library will be found?
+ </p></td></tr><tr class="question" title="3.4."><td align="left" valign="top"><a id="faq.how_to_set_paths"/><a id="q-how_to_set_paths"/><p><
b>3.4.</b></p></td><td align="left" valign="top"><p>How do I insure that the dynamically linked library will be found?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-how_to_set_paths"/></td><td align="left" valign="top"><p>
Depending on your platform and library version, the error message might
be similar to one of the following:
</p><p>
Using LD_LIBRARY_PATH is not always the best solution, <a class="link" href="manual/using_dynamic_or_shared.html#manual.intro.using.linkage.dynamic" title="Finding Dynamic or Shared Libraries">Finding Dynamic or Shared
Libraries</a> in the manual gives some alternatives.
- </p></td></tr><tr class="question" title="3.5."><td align="left" valign="top"><a id="faq.what_is_libsupcxx"/><a id="q-what_is_libsupcxx"/><p><
strong>3.5.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="3.5."><td align="left" valign="top"><a id="faq.what_is_libsupcxx"/><a id="q-what_is_libsupcxx"/><p><
b>3.5.</b></p></td><td align="left" valign="top"><p>
What's libsupc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-what_is_libsupcxx"/></td><td align="left" valign="top"><p>
If the only functions from <code class="filename">libstdc++.a</code>
using anything from the rest of the library, such as IOStreams
or vectors, then you'll still need pieces from
<code class="filename">libstdc++.a</code>.
- </p></td></tr><tr class="question" title="3.6."><td align="left" valign="top"><a id="faq.size"/><a id="q-size"/><p><
strong>3.6.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="3.6."><td align="left" valign="top"><a id="faq.size"/><a id="q-size"/><p><
b>3.6.</b></p></td><td align="left" valign="top"><p>
This library is HUGE!
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-size"/></td><td align="left" valign="top"><p>
Usually the size of libraries on disk isn't noticeable. When a
Recent GNU/Linux glibc required?
</a></dt><dt>4.8. <a href="faq.html#faq.freebsd_wchar">
Can't use wchar_t/wstring on FreeBSD
- </a></dt></dl></td></tr><tr class="question" title="4.1."><td align="left" valign="top"><a id="faq.other_compilers"/><a id="q-other_compilers"/><p><
strong>4.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="4.1."><td align="left" valign="top"><a id="faq.other_compilers"/><a id="q-other_compilers"/><p><
b>4.1.</b></p></td><td align="left" valign="top"><p>
Can libstdc++ be used with non-GNU compilers?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-other_compilers"/></td><td align="left" valign="top"><p>
Perhaps.
been known to work with versions of the EDG C++ compiler, and
vendor-specific proprietary C++ compilers such as the Intel ICC
C++ compiler.
- </p></td></tr><tr class="question" title="4.2."><td align="left" valign="top"><a id="faq.solaris_long_long"/><a id="q-solaris_long_long"/><p><
strong>4.2.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.2."><td align="left" valign="top"><a id="faq.solaris_long_long"/><a id="q-solaris_long_long"/><p><
b>4.2.</b></p></td><td align="left" valign="top"><p>
No 'long long' type on Solaris?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-solaris_long_long"/></td><td align="left" valign="top"><p>
By default we try to support the C99 <span class="type">long long</span> type.
commonly reported platform affected was Solaris.
</p><p>
This has been fixed for libstdc++ releases greater than 3.0.3.
- </p></td></tr><tr class="question" title="4.3."><td align="left" valign="top"><a id="faq.predefined"/><a id="q-predefined"/><p><
strong>4.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.3."><td align="left" valign="top"><a id="faq.predefined"/><a id="q-predefined"/><p><
b>4.3.</b></p></td><td align="left" valign="top"><p>
<code class="constant">_XOPEN_SOURCE</code> and <code class="constant">_GNU_SOURCE</code> are always defined?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-predefined"/></td><td align="left" valign="top"><p>On Solaris, g++ (but not gcc) always defines the preprocessor
macro <code class="constant">_XOPEN_SOURCE</code>. On GNU/Linux, the same happens
<span class="command"><strong>g++ -E -dM - < /dev/null"</strong></span> to display
a list of predefined macros for any particular installation.
</p><p>This has been discussed on the mailing lists
- <a class="link" href="http://gcc.gnu.org/cgi-bin/htsearch?method=and&format=builtin-long&sort=score&words=_XOPEN_SOURCE+Solaris">quite a bit</a>.
+ <a class="link" href="http://gcc.gnu.org/cgi-bin/htsearch?method=and&format=builtin-long&sort=score&words=_XOPEN_SOURCE+Solaris" target="">quite a bit</a>.
</p><p>This method is something of a wart. We'd like to find a cleaner
solution, but nobody yet has contributed the time.
- </p></td></tr><tr class="question" title="4.4."><td align="left" valign="top"><a id="faq.darwin_ctype"/><a id="q-darwin_ctype"/><p><
strong>4.4.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.4."><td align="left" valign="top"><a id="faq.darwin_ctype"/><a id="q-darwin_ctype"/><p><
b>4.4.</b></p></td><td align="left" valign="top"><p>
Mac OS X <code class="filename">ctype.h</code> is broken! How can I fix it?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-darwin_ctype"/></td><td align="left" valign="top"><p>This is a long-standing bug in the OS X support. Fortunately,
the patch is quite simple, and well-known.
- <a class="link" href="http://gcc.gnu.org/ml/gcc/2002-03/msg00817.html"> Here's a
+ <a class="link" href="http://gcc.gnu.org/ml/gcc/2002-03/msg00817.html" target=""> Here's a
link to the solution</a>.
- </p></td></tr><tr class="question" title="4.5."><td align="left" valign="top"><a id="faq.threads_i386"/><a id="q-threads_i386"/><p><
strong>4.5.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.5."><td align="left" valign="top"><a id="faq.threads_i386"/><a id="q-threads_i386"/><p><
b>4.5.</b></p></td><td align="left" valign="top"><p>
Threading is broken on i386?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-threads_i386"/></td><td align="left" valign="top"><p>
</p><p>Support for atomic integer operations is/was broken on i386
on an i686, then you would encounter no problems. Only when
actually running the code on a i386 will the problem appear.
</p><p>This is fixed in 3.2.2.
- </p></td></tr><tr class="question" title="4.6."><td align="left" valign="top"><a id="faq.atomic_mips"/><a id="q-atomic_mips"/><p><
strong>4.6.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.6."><td align="left" valign="top"><a id="faq.atomic_mips"/><a id="q-atomic_mips"/><p><
b>4.6.</b></p></td><td align="left" valign="top"><p>
MIPS atomic operations
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-atomic_mips"/></td><td align="left" valign="top"><p>
The atomic locking routines for MIPS targets requires MIPS II
</p><p>
The mips*-*-linux* port continues to use the MIPS II routines, and more
work in this area is expected.
- </p></td></tr><tr class="question" title="4.7."><td align="left" valign="top"><a id="faq.linux_glibc"/><a id="q-linux_glibc"/><p><
strong>4.7.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.7."><td align="left" valign="top"><a id="faq.linux_glibc"/><a id="q-linux_glibc"/><p><
b>4.7.</b></p></td><td align="left" valign="top"><p>
Recent GNU/Linux glibc required?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-linux_glibc"/></td><td align="left" valign="top"><p>When running on GNU/Linux, libstdc++ 3.2.1 (shared library version
5.0.1) and later uses localization and formatting code from the system
</p><p>The guideline is simple: the more recent the C++ library, the
more recent the C library. (This is also documented in the main
GCC installation instructions.)
- </p></td></tr><tr class="question" title="4.8."><td align="left" valign="top"><a id="faq.freebsd_wchar"/><a id="q-freebsd_wchar"/><p><
strong>4.8.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="4.8."><td align="left" valign="top"><a id="faq.freebsd_wchar"/><a id="q-freebsd_wchar"/><p><
b>4.8.</b></p></td><td align="left" valign="top"><p>
Can't use wchar_t/wstring on FreeBSD
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-freebsd_wchar"/></td><td align="left" valign="top"><p>
Older versions of FreeBSD's C library do not have sufficient
Bugs in the ISO C++ language or library specification
</a></dt><dt>5.3. <a href="faq.html#faq.compiler_bugs">
Bugs in the compiler (gcc/g++) and not libstdc++
- </a></dt></dl></td></tr><tr class="question" title="5.1."><td align="left" valign="top"><a id="faq.what_works"/><a id="q-what_works"/><p><
strong>5.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="5.1."><td align="left" valign="top"><a id="faq.what_works"/><a id="q-what_works"/><p><
b>5.1.</b></p></td><td align="left" valign="top"><p>
What works already?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-what_works"/></td><td align="left" valign="top"><p>
Short answer: Pretty much everything <span class="emphasis"><em>works</em></span>
<a class="link" href="manual/status.html#status.iso.1998" title="C++ 1998/2003">C++98</a>,
<a class="link" href="manual/status.html#status.iso.tr1" title="C++ TR1">TR1</a>, and
<a class="link" href="manual/status.html#status.iso.200x" title="C++ 200x">C++0x</a>.
- </p></td></tr><tr class="question" title="5.2."><td align="left" valign="top"><a id="faq.standard_bugs"/><a id="q-standard_bugs"/><p><
strong>5.2.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="5.2."><td align="left" valign="top"><a id="faq.standard_bugs"/><a id="q-standard_bugs"/><p><
b>5.2.</b></p></td><td align="left" valign="top"><p>
Bugs in the ISO C++ language or library specification
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-standard_bugs"/></td><td align="left" valign="top"><p>
Unfortunately, there are some.
For those people who are not part of the ISO Library Group
(i.e., nearly all of us needing to read this page in the first
place), a public list of the library defects is occasionally
- published <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/">here</a>.
+ published <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/" target="">here</a>.
Some of these issues have resulted in code changes in libstdc++.
</p><p>
If you think you've discovered a new bug that is not listed,
please post a message describing your problem
to <code class="email"><<a class="email" href="mailto:libstdc++@gcc.gnu.org">libstdc++@gcc.gnu.org</a>></code> or the Usenet group
comp.lang.c++.moderated.
- </p></td></tr><tr class="question" title="5.3."><td align="left" valign="top"><a id="faq.compiler_bugs"/><a id="q-compiler_bugs"/><p><
strong>5.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="5.3."><td align="left" valign="top"><a id="faq.compiler_bugs"/><a id="q-compiler_bugs"/><p><
b>5.3.</b></p></td><td align="left" valign="top"><p>
Bugs in the compiler (gcc/g++) and not libstdc++
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-compiler_bugs"/></td><td align="left" valign="top"><p>
On occasion, the compiler is wrong. Please be advised that this
these lists with terms describing your issue.
</p><p>
Before reporting a bug, please examine the
- <a class="link" href="http://gcc.gnu.org/bugs/">bugs database</a> with the
+ <a class="link" href="http://gcc.gnu.org/bugs/" target="">bugs database</a> with the
category set to <span class="quote">“<span class="quote">g++</span>”</span>.
</p></td></tr><tr class="toc"><td align="left" valign="top" colspan="2"><dl><dt>6.1. <a href="faq.html#faq.stream_reopening_fails">
Reopening a stream fails
list::size() is O(n)!
</a></dt><dt>6.9. <a href="faq.html#faq.easy_to_fix">
Aw, that's easy to fix!
- </a></dt></dl></td></tr><tr class="question" title="6.1."><td align="left" valign="top"><a id="faq.stream_reopening_fails"/><a id="q-stream_reopening_fails"/><p><
strong>6.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="6.1."><td align="left" valign="top"><a id="faq.stream_reopening_fails"/><a id="q-stream_reopening_fails"/><p><
b>6.1.</b></p></td><td align="left" valign="top"><p>
Reopening a stream fails
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-stream_reopening_fails"/></td><td align="left" valign="top"><p>
One of the most-reported non-bug reports. Executing a sequence like:
<span class="emphasis"><em>Update:</em></span> for GCC 4.0 we implemented the resolution
of <a class="link" href="manual/bugs.html" title="Bugs">DR #409</a> and open()
now calls <code class="function">clear()</code> on success!
- </p></td></tr><tr class="question" title="6.2."><td align="left" valign="top"><a id="faq.wefcxx_verbose"/><a id="q-wefcxx_verbose"/><p><
strong>6.2.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.2."><td align="left" valign="top"><a id="faq.wefcxx_verbose"/><a id="q-wefcxx_verbose"/><p><
b>6.2.</b></p></td><td align="left" valign="top"><p>
-Weffc++ complains too much
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-wefcxx_verbose"/></td><td align="left" valign="top"><p>
Many warnings are emitted when <code class="literal">-Weffc++</code> is used. Making
We do, however, try to have libstdc++ sources as clean as possible. If
you see some simple changes that pacify <code class="literal">-Weffc++</code>
without other drawbacks, send us a patch.
- </p></td></tr><tr class="question" title="6.3."><td align="left" valign="top"><a id="faq.ambiguous_overloads"/><a id="q-ambiguous_overloads"/><p><
strong>6.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.3."><td align="left" valign="top"><a id="faq.ambiguous_overloads"/><a id="q-ambiguous_overloads"/><p><
b>6.3.</b></p></td><td align="left" valign="top"><p>
Ambiguous overloads after including an old-style header
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-ambiguous_overloads"/></td><td align="left" valign="top"><p>
Another problem is the <code class="literal">rel_ops</code> namespace and the template
(e.g., <span class="quote">“<span class="quote">using</span>”</span> them and the <iterator> header),
then you will suddenly be faced with huge numbers of ambiguity
errors. This was discussed on the -v3 list; Nathan Myers
- <a class="link" href="http://gcc.gnu.org/ml/libstdc++/2001-01/msg00247.html">sums
+ <a class="link" href="http://gcc.gnu.org/ml/libstdc++/2001-01/msg00247.html" target="">sums
things up here</a>. The collisions with vector/string iterator
types have been fixed for 3.1.
- </p></td></tr><tr class="question" title="6.4."><td align="left" valign="top"><a id="faq.v2_headers"/><a id="q-v2_headers"/><p><
strong>6.4.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.4."><td align="left" valign="top"><a id="faq.v2_headers"/><a id="q-v2_headers"/><p><
b>6.4.</b></p></td><td align="left" valign="top"><p>
The g++-3 headers are <span class="emphasis"><em>not ours</em></span>
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-v2_headers"/></td><td align="left" valign="top"><p>
If you are using headers in
'v'?). Starting with version 3.2 the headers are installed in
<code class="filename">${prefix}/include/c++/${version}</code> as this prevents
headers from previous versions being found by mistake.
- </p></td></tr><tr class="question" title="6.5."><td align="left" valign="top"><a id="faq.boost_concept_checks"/><a id="q-boost_concept_checks"/><p><
strong>6.5.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.5."><td align="left" valign="top"><a id="faq.boost_concept_checks"/><a id="q-boost_concept_checks"/><p><
b>6.5.</b></p></td><td align="left" valign="top"><p>
Errors about <span class="emphasis"><em>*Concept</em></span> and
<span class="emphasis"><em>constraints</em></span> in the STL
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-boost_concept_checks"/></td><td align="left" valign="top"><p>
checks, is available in the
<a class="link" href="manual/bk01pt02ch05s02.html" title="Concept Checking">Diagnostics</a>.
chapter of the manual.
- </p></td></tr><tr class="question" title="6.6."><td align="left" valign="top"><a id="faq.dlopen_crash"/><a id="q-dlopen_crash"/><p><
strong>6.6.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.6."><td align="left" valign="top"><a id="faq.dlopen_crash"/><a id="q-dlopen_crash"/><p><
b>6.6.</b></p></td><td align="left" valign="top"><p>
Program crashes when using library code in a
dynamically-loaded library
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-dlopen_crash"/></td><td align="left" valign="top"><p>
<br/>
// link the executable<br/>
g++ -fPIC -rdynamic -o foo ... -L. -lfoo -ldl<br/>
- </p></div></td></tr><tr class="question" title="6.7."><td align="left" valign="top"><a id="faq.memory_leaks"/><a id="q-memory_leaks"/><p><
strong>6.7.</strong></p></td><td align="left" valign="top"><p>
+ </p></div></td></tr><tr class="question" title="6.7."><td align="left" valign="top"><a id="faq.memory_leaks"/><a id="q-memory_leaks"/><p><
b>6.7.</b></p></td><td align="left" valign="top"><p>
<span class="quote">“<span class="quote">Memory leaks</span>”</span> in containers
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-memory_leaks"/></td><td align="left" valign="top"><p>
A few people have reported that the standard containers appear
to leak memory when tested with memory checkers such as
- <a class="link" href="http://valgrind.org/">valgrind</a>.
+ <a class="link" href="http://valgrind.org/" target="">valgrind</a>.
The library's default allocators keep free memory in a pool
for later reuse, rather than returning it to the OS. Although
this memory is always reachable by the library and is never
want to test the library for memory leaks please read
<a class="link" href="manual/debug.html#debug.memory" title="Memory Leak Hunting">Tips for memory leak hunting</a>
first.
- </p></td></tr><tr class="question" title="6.8."><td align="left" valign="top"><a id="faq.list_size_on"/><a id="q-list_size_on"/><p><
strong>6.8.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.8."><td align="left" valign="top"><a id="faq.list_size_on"/><a id="q-list_size_on"/><p><
b>6.8.</b></p></td><td align="left" valign="top"><p>
list::size() is O(n)!
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-list_size_on"/></td><td align="left" valign="top"><p>
See
the <a class="link" href="manual/containers.html" title="Chapter 9. Containers">Containers</a>
chapter.
- </p></td></tr><tr class="question" title="6.9."><td align="left" valign="top"><a id="faq.easy_to_fix"/><a id="q-easy_to_fix"/><p><
strong>6.9.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="6.9."><td align="left" valign="top"><a id="faq.easy_to_fix"/><a id="q-easy_to_fix"/><p><
b>6.9.</b></p></td><td align="left" valign="top"><p>
Aw, that's easy to fix!
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-easy_to_fix"/></td><td align="left" valign="top"><p>
If you have found a bug in the library and you think you have
a working fix, then send it in! The main GCC site has a page
- on <a class="link" href="http://gcc.gnu.org/contribute.html">submitting
+ on <a class="link" href="http://gcc.gnu.org/contribute.html" target="">submitting
patches</a> that covers the procedure, but for libstdc++ you
should also send the patch to our mailing list in addition to
the GCC patches mailing list. The libstdc++
What's an ABI and why is it so messy?
</a></dt><dt>7.8. <a href="faq.html#faq.size_equals_capacity">
How do I make std::vector<T>::capacity() == std::vector<T>::size?
- </a></dt></dl></td></tr><tr class="question" title="7.1."><td align="left" valign="top"><a id="faq.iterator_as_pod"/><a id="faq.iterator_as_pod_q"/><p><
strong>7.1.</strong></p></td><td align="left" valign="top"><p>
+ </a></dt></dl></td></tr><tr class="question" title="7.1."><td align="left" valign="top"><a id="faq.iterator_as_pod"/><a id="faq.iterator_as_pod_q"/><p><
b>7.1.</b></p></td><td align="left" valign="top"><p>
string::iterator is not char*; vector<T>::iterator is not T*
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="faq.iterator_as_pod_a"/></td><td align="left" valign="top"><p>
If you have code that depends on container<T> iterators
certain expressions to <code class="varname">&*i</code>. Future revisions
of the Standard are expected to bless this usage for
vector<> (but not for basic_string<>).
- </p></td></tr><tr class="question" title="7.2."><td align="left" valign="top"><a id="faq.what_is_next"/><a id="q-what_is_next"/><p><
strong>7.2.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.2."><td align="left" valign="top"><a id="faq.what_is_next"/><a id="q-what_is_next"/><p><
b>7.2.</b></p></td><td align="left" valign="top"><p>
What's next after libstdc++?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-what_is_next"/></td><td align="left" valign="top"><p>
Hopefully, not much. The goal of libstdc++ is to produce a
There is an effort underway to add significant extensions to
the standard library specification. The latest version of
this effort is described in
- <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf">
+ <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="">
The C++ Library Technical Report 1</a>.
- </p></td></tr><tr class="question" title="7.3."><td align="left" valign="top"><a id="faq.sgi_stl"/><a id="q-sgi_stl"/><p><
strong>7.3.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.3."><td align="left" valign="top"><a id="faq.sgi_stl"/><a id="q-sgi_stl"/><p><
b>7.3.</b></p></td><td align="left" valign="top"><p>
What about the STL from SGI?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-sgi_stl"/></td><td align="left" valign="top"><p>
- The <a class="link" href="http://www.sgi.com/tech/stl/">STL from SGI</a>,
+ The <a class="link" href="http://www.sgi.com/tech/stl/" target="">STL from SGI</a>,
version 3.3, was the final merge of the STL codebase. The
code in libstdc++ contains many fixes and changes, and
the SGI code is no longer under active
</p><p>
The FAQ for SGI's STL (one jump off of their main page) is
still recommended reading.
- </p></td></tr><tr class="question" title="7.4."><td align="left" valign="top"><a id="faq.extensions_and_backwards_compat"/><a id="q-extensions_and_backwards_compat"/><p><
strong>7.4.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.4."><td align="left" valign="top"><a id="faq.extensions_and_backwards_compat"/><a id="q-extensions_and_backwards_compat"/><p><
b>7.4.</b></p></td><td align="left" valign="top"><p>
Extensions and Backward Compatibility
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-extensions_and_backwards_compat"/></td><td align="left" valign="top"><p>
See the <a class="link" href="manual/backwards.html" title="Backwards Compatibility">link</a> on backwards compatibility and <a class="link" href="manual/api.html" title="API Evolution and Deprecation History">link</a> on evolution.
- </p></td></tr><tr class="question" title="7.5."><td align="left" valign="top"><a id="faq.tr1_support"/><a id="q-tr1_support"/><p><
strong>7.5.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.5."><td align="left" valign="top"><a id="faq.tr1_support"/><a id="q-tr1_support"/><p><
b>7.5.</b></p></td><td align="left" valign="top"><p>
Does libstdc++ support TR1?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-tr1_support"/></td><td align="left" valign="top"><p>
Yes.
</p><p>
The C++ Standard Library Technical Report adds many new features to
the library. The latest version of this effort is described in
- <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf">
+ <a class="link" href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="">
Technical Report 1</a>.
</p><p>
The implementation status of TR1 in libstdc++ can be tracked <a class="link" href="manual/status.html#status.iso.tr1" title="C++ TR1">on the TR1 status
page</a>.
- </p></td></tr><tr class="question" title="7.6."><td align="left" valign="top"><a id="faq.get_iso_cxx"/><a id="q-get_iso_cxx"/><p><
strong>7.6.</strong></p></td><td align="left" valign="top"><p>How do I get a copy of the ISO C++ Standard?
+ </p></td></tr><tr class="question" title="7.6."><td align="left" valign="top"><a id="faq.get_iso_cxx"/><a id="q-get_iso_cxx"/><p><
b>7.6.</b></p></td><td align="left" valign="top"><p>How do I get a copy of the ISO C++ Standard?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-get_iso_cxx"/></td><td align="left" valign="top"><p>
Copies of the full ISO 14882 standard are available on line via
the ISO mirror site for committee members. Non-members, or those
get a copy of the standard from their respective national
standards organization. In the USA, this national standards
organization is ANSI and their website is
- right <a class="link" href="http://www.ansi.org">here</a>. (And if
+ right <a class="link" href="http://www.ansi.org" target="">here</a>. (And if
you've already registered with them, clicking this link will take
you to directly to the place where you can
- <a class="link" href="http://webstore.ansi.org/RecordDetail.aspx?sku=ISO%2FIEC+14882:2003">buy the standard on-line</a>.
+ <a class="link" href="http://webstore.ansi.org/RecordDetail.aspx?sku=ISO%2FIEC+14882:2003" target="">buy the standard on-line</a>.
</p><p>
Who is your country's member body? Visit the
- <a class="link" href="http://www.iso.ch/">ISO homepage</a> and find out!
+ <a class="link" href="http://www.iso.ch/" target="">ISO homepage</a> and find out!
</p><p>
The 2003 version of the standard (the 1998 version plus TC1) is
available in print, ISBN 0-470-84674-7.
- </p></td></tr><tr class="question" title="7.7."><td align="left" valign="top"><a id="faq.what_is_abi"/><a id="q-what_is_abi"/><p><
strong>7.7.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.7."><td align="left" valign="top"><a id="faq.what_is_abi"/><a id="q-what_is_abi"/><p><
b>7.7.</b></p></td><td align="left" valign="top"><p>
What's an ABI and why is it so messy?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-what_is_abi"/></td><td align="left" valign="top"><p>
<acronym class="acronym">ABI</acronym> stands for <span class="quote">“<span class="quote">Application Binary
so they may later be changed. Deciding which, and implementing
the decisions, must happen before you can reasonably document a
candidate C++ ABI that encompasses the standard library.
- </p></td></tr><tr class="question" title="7.8."><td align="left" valign="top"><a id="faq.size_equals_capacity"/><a id="q-size_equals_capacity"/><p><
strong>7.8.</strong></p></td><td align="left" valign="top"><p>
+ </p></td></tr><tr class="question" title="7.8."><td align="left" valign="top"><a id="faq.size_equals_capacity"/><a id="q-size_equals_capacity"/><p><
b>7.8.</b></p></td><td align="left" valign="top"><p>
How do I make std::vector<T>::capacity() == std::vector<T>::size?
</p></td></tr><tr class="answer"><td align="left" valign="top"><a id="a-size_equals_capacity"/></td><td align="left" valign="top"><p>
The standard idiom for deallocating a <code class="classname">vector<T></code>'s
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