* docs/html/ext/howto.html: Update URL for SGI STL docs.
* docs/html/faq/index.html: Same.
* docs/html/faq/index.txt: Regenerate.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@69463
138bc75d-0d04-0410-961f-
82ee72b054a4
+2003-07-16 Jonathan Wakely <redi@gcc.gnu.org>
+
+ * docs/html/ext/howto.html: Update URL for SGI STL docs.
+ * docs/html/faq/index.html: Same.
+ * docs/html/faq/index.txt: Regenerate.
+
2003-07-16 Paolo Carlini <pcarlini@unitus.it>
PR libstdc++/11528
2003-07-16 Paolo Carlini <pcarlini@unitus.it>
PR libstdc++/11528
</p>
<p>Each of the associative containers map, multimap, set, and multiset
have a counterpart which uses a
</p>
<p>Each of the associative containers map, multimap, set, and multiset
have a counterpart which uses a
- <a href="http://www.sgi.com/Technology/STL/HashFunction.html">hashing
+ <a href="http://www.sgi.com/tech/stl/HashFunction.html">hashing
function</a> to do the arranging, instead of a strict weak ordering
function. The classes take as one of their template parameters a
function object that will return the hash value; by default, an
instantiation of
function</a> to do the arranging, instead of a strict weak ordering
function. The classes take as one of their template parameters a
function object that will return the hash value; by default, an
instantiation of
- <a href="http://www.sgi.com/Technology/STL/hash.html">hash</a>.
+ <a href="http://www.sgi.com/tech/stl/hash.html">hash</a>.
You should specialize this functor for your class, or define your own,
before trying to use one of the hashing classes.
</p>
You should specialize this functor for your class, or define your own,
before trying to use one of the hashing classes.
</p>
<hr />
<h2><a name="5_3">5.3 What about the STL from SGI?</a></h2>
<hr />
<h2><a name="5_3">5.3 What about the STL from SGI?</a></h2>
- <p>The <a href="http://www.sgi.com/Technology/STL/">STL from SGI</a>,
+ <p>The <a href="http://www.sgi.com/tech/stl/">STL from SGI</a>,
version 3.3, was the most recent merge of the STL codebase. The
code in libstdc++ contains many fixes and changes, and it is
very likely that the SGI code is no longer under active
version 3.3, was the most recent merge of the STL codebase. The
code in libstdc++ contains many fixes and changes, and it is
very likely that the SGI code is no longer under active
libstdc++ Frequently Asked Questions
libstdc++ Frequently Asked Questions
The latest version of this document is always available at
[1]http://gcc.gnu.org/onlinedocs/libstdc++/faq/. The main
documentation page is at
[2]http://gcc.gnu.org/onlinedocs/libstdc++/documentation.html.
The latest version of this document is always available at
[1]http://gcc.gnu.org/onlinedocs/libstdc++/faq/. The main
documentation page is at
[2]http://gcc.gnu.org/onlinedocs/libstdc++/documentation.html.
To the [3]libstdc++-v3 homepage.
_________________________________________________________________
To the [3]libstdc++-v3 homepage.
_________________________________________________________________
1. [4]General Information
1. [5]What is libstdc++-v3?
2. [6]Why should I use libstdc++?
1. [4]General Information
1. [5]What is libstdc++-v3?
2. [6]Why should I use libstdc++?
7. [52]How do I get a copy of the ISO C++ Standard?
8. [53]What's an ABI and why is it so messy?
_________________________________________________________________
7. [52]How do I get a copy of the ISO C++ Standard?
8. [53]What's an ABI and why is it so messy?
_________________________________________________________________
1.1 What is libstdc++-v3?
The GNU Standard C++ Library v3 is an ongoing project to implement the
1.1 What is libstdc++-v3?
The GNU Standard C++ Library v3 is an ongoing project to implement the
just want the latest bleeding-edge code, the up-to-date source is
available over anonymous CVS, and can even be browsed over the Web
(see [55]1.4 below).
just want the latest bleeding-edge code, the up-to-date source is
available over anonymous CVS, and can even be browsed over the Web
(see [55]1.4 below).
The older libstdc++-v2 project is no longer maintained; the code has
been completely replaced and rewritten. [56]If you are using V2, then
you need to report bugs to your system vendor, not to the V3 list.
The older libstdc++-v2 project is no longer maintained; the code has
been completely replaced and rewritten. [56]If you are using V2, then
you need to report bugs to your system vendor, not to the V3 list.
A more formal description of the V3 goals can be found in the official
[57]design document.
_________________________________________________________________
A more formal description of the V3 goals can be found in the official
[57]design document.
_________________________________________________________________
1.2 Why should I use libstdc++?
The completion of the ISO C++ standardization gave the C++ community a
1.2 Why should I use libstdc++?
The completion of the ISO C++ standardization gave the C++ community a
Library. However, all existing C++ implementations are (as the Draft
Standard used to say) "incomplet and incorrekt," and many suffer from
limitations of the compilers that use them.
Library. However, all existing C++ implementations are (as the Draft
Standard used to say) "incomplet and incorrekt," and many suffer from
limitations of the compilers that use them.
The GNU C/C++/FORTRAN/<pick-a-language> compiler (gcc, g++, etc) is
widely considered to be one of the leading compilers in the world. Its
development has recently been taken over by the [58]GCC team. All of
the rapid development and near-legendary [59]portability that are the
hallmarks of an open-source project are being applied to libstdc++.
The GNU C/C++/FORTRAN/<pick-a-language> compiler (gcc, g++, etc) is
widely considered to be one of the leading compilers in the world. Its
development has recently been taken over by the [58]GCC team. All of
the rapid development and near-legendary [59]portability that are the
hallmarks of an open-source project are being applied to libstdc++.
That means that all of the Standard classes and functions (such as
string, vector<>, iostreams, and algorithms) will be freely available
and fully compliant. Programmers will no longer need to "roll their
own" nor be worried about platform-specific incompatibilities.
_________________________________________________________________
That means that all of the Standard classes and functions (such as
string, vector<>, iostreams, and algorithms) will be freely available
and fully compliant. Programmers will no longer need to "roll their
own" nor be worried about platform-specific incompatibilities.
_________________________________________________________________
1.3 Who's in charge of it?
The libstdc++ project is contributed to by several developers all over
the world, in the same way as GCC or Linux. Benjamin Kosnik, Gabriel
Dos Reis, Phil Edwards, Ulrich Drepper, Loren James Rittle, and Paolo
Carlini are the lead maintainers of the CVS archive.
1.3 Who's in charge of it?
The libstdc++ project is contributed to by several developers all over
the world, in the same way as GCC or Linux. Benjamin Kosnik, Gabriel
Dos Reis, Phil Edwards, Ulrich Drepper, Loren James Rittle, and Paolo
Carlini are the lead maintainers of the CVS archive.
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 [60]homepage.
If you have questions, ideas, code, or are just curious, sign up!
_________________________________________________________________
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 [60]homepage.
If you have questions, ideas, code, or are just curious, sign up!
_________________________________________________________________
1.4 How do I get libstdc++?
The [61]homepage has instructions for retrieving the latest CVS
sources, and for browsing the CVS sources over the web.
1.4 How do I get libstdc++?
The [61]homepage has instructions for retrieving the latest CVS
sources, and for browsing the CVS sources over the web.
Stable versions of libstdc++-v3 are included with releases of [62]the
GCC compilers.
Stable versions of libstdc++-v3 are included with releases of [62]the
GCC compilers.
The subset commonly known as the Standard Template Library (chapters
23 through 25, mostly) is adapted from the final release of the SGI
STL.
_________________________________________________________________
The subset commonly known as the Standard Template Library (chapters
23 through 25, mostly) is adapted from the final release of the SGI
STL.
_________________________________________________________________
1.5 When is libstdc++ going to be finished?
Nathan Myers gave the best of all possible answers, responding to a
Usenet article asking this question: Sooner, if you help.
_________________________________________________________________
1.5 When is libstdc++ going to be finished?
Nathan Myers gave the best of all possible answers, responding to a
Usenet article asking this question: Sooner, if you help.
_________________________________________________________________
1.6 How do I contribute to the effort?
Here is [63]a page devoted to this topic. Subscribing to the mailing
1.6 How do I contribute to the effort?
Here is [63]a page devoted to this topic. Subscribing to the mailing
is willing to help write documentation, for example, or has found a
bug in code that we all thought was working, is more than welcome!
_________________________________________________________________
is willing to help write documentation, for example, or has found a
bug in code that we all thought was working, is more than welcome!
_________________________________________________________________
1.7 What happened to libg++? I need that!
The most recent libg++ README states that libg++ is no longer being
actively maintained. It should not be used for new projects, and is
only being kicked along to support older code.
1.7 What happened to libg++? I need that!
The most recent libg++ README states that libg++ is no longer being
actively maintained. It should not be used for new projects, and is
only being kicked along to support older code.
The libg++ was designed and created when there was no Standard to
provide guidance. Classes like linked lists are now provided for by
list<T> and do not need to be created by genclass. (For that matter,
templates exist now and are well-supported, whereas genclass (mostly)
predates them.)
The libg++ was designed and created when there was no Standard to
provide guidance. Classes like linked lists are now provided for by
list<T> and do not need to be created by genclass. (For that matter,
templates exist now and are well-supported, whereas genclass (mostly)
predates them.)
There are other classes in libg++ that are not specified in the ISO
Standard (e.g., statistical analysis). While there are a lot of really
useful things that are used by a lot of people (e.g., statistics :-),
the Standards Committee couldn't include everything, and so a lot of
those "obvious" classes didn't get included.
There are other classes in libg++ that are not specified in the ISO
Standard (e.g., statistical analysis). While there are a lot of really
useful things that are used by a lot of people (e.g., statistics :-),
the Standards Committee couldn't include everything, and so a lot of
those "obvious" classes didn't get included.
Since libstdc++ is an implementation of the Standard Library, we have
no plans at this time to include non-Standard utilities in the
implementation, however handy they are. (The extensions provided in
Since libstdc++ is an implementation of the Standard Library, we have
no plans at this time to include non-Standard utilities in the
implementation, however handy they are. (The extensions provided in
entirely plausable that the "useful stuff" from libg++ might be
extracted into an updated utilities library, but nobody has started
such a project yet.
entirely plausable that the "useful stuff" from libg++ might be
extracted into an updated utilities library, but nobody has started
such a project yet.
(The [64]Boost site houses free C++ libraries that do varying things,
and happened to be started by members of the Standards Committee.
Certain "useful stuff" classes will probably migrate there.)
(The [64]Boost site houses free C++ libraries that do varying things,
and happened to be started by members of the Standards Committee.
Certain "useful stuff" classes will probably migrate there.)
For the bold and/or desperate, the [65]GCC extensions page describes
where to find the last libg++ source.
_________________________________________________________________
For the bold and/or desperate, the [65]GCC extensions page describes
where to find the last libg++ source.
_________________________________________________________________
1.8 What if I have more questions?
If you have read the README and RELEASE-NOTES files, and your question
1.8 What if I have more questions?
If you have read the README and RELEASE-NOTES files, and your question
not need to be subscribed to the list to send a message to it. More
information is available on the homepage (including how to browse the
list archives); to send to the list, use [66]libstdc++@gcc.gnu.org.
not need to be subscribed to the list to send a message to it. More
information is available on the homepage (including how to browse the
list archives); to send to the list, use [66]libstdc++@gcc.gnu.org.
If you have a question that you think should be included here, or if
you have a question about a question/answer here, contact [67]Phil
Edwards or [68]Gabriel Dos Reis.
_________________________________________________________________
If you have a question that you think should be included here, or if
you have a question about a question/answer here, contact [67]Phil
Edwards or [68]Gabriel Dos Reis.
_________________________________________________________________
1.9 What are the license terms for libstdc++-v3?
See [69]our license description for these and related questions.
_________________________________________________________________
1.9 What are the license terms for libstdc++-v3?
See [69]our license description for these and related questions.
_________________________________________________________________
2.1 How do I install libstdc++-v3?
Complete instructions are not given here (this is a FAQ, not an
2.1 How do I install libstdc++-v3?
Complete instructions are not given here (this is a FAQ, not an
* GNU Make is recommended, but should not be required.
* The GNU Autotools are needed if you are messing with the configury
or makefiles.
* GNU Make is recommended, but should not be required.
* The GNU Autotools are needed if you are messing with the configury
or makefiles.
The file [70]documentation.html provides a good overview of the steps
necessary to build, install, and use the library. Instructions for
configuring the library with new flags such as --enable-threads are
there also, as well as patches and instructions for working with GCC
2.95.
The file [70]documentation.html provides a good overview of the steps
necessary to build, install, and use the library. Instructions for
configuring the library with new flags such as --enable-threads are
there also, as well as patches and instructions for working with GCC
2.95.
The top-level install.html and [71]RELEASE-NOTES files contain the
exact build and installation instructions. You may wish to browse
those files over CVSweb ahead of time to get a feel for what's
required. RELEASE-NOTES is located in the ".../docs/17_intro/"
directory of the distribution.
_________________________________________________________________
The top-level install.html and [71]RELEASE-NOTES files contain the
exact build and installation instructions. You may wish to browse
those files over CVSweb ahead of time to get a feel for what's
required. RELEASE-NOTES is located in the ".../docs/17_intro/"
directory of the distribution.
_________________________________________________________________
2.2 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
2.2 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
2.3 What is this CVS thing that you keep mentioning?
The Concurrent Versions System is one of several revision control
2.3 What is this CVS thing that you keep mentioning?
The Concurrent Versions System is one of several revision control
free (beer), and very high quality. The [72]CVS entry in the GNU
software catalogue has a better description as well as a [73]link to
the makers of CVS.
free (beer), and very high quality. The [72]CVS entry in the GNU
software catalogue has a better description as well as a [73]link to
the makers of CVS.
The "anonymous client checkout" feature of CVS is similar to anonymous
FTP in that it allows anyone to retrieve the latest libstdc++ sources.
The "anonymous client checkout" feature of CVS is similar to anonymous
FTP in that it allows anyone to retrieve the latest libstdc++ sources.
After the first of April, American users will have a "/pharmacy"
command-line option...
_________________________________________________________________
After the first of April, American users will have a "/pharmacy"
command-line option...
_________________________________________________________________
2.4 How do I know if it works?
libstdc++-v3 comes with its own testsuite. You do not need to actually
install the library ("make install") to run the testsuite, but you do
need DejaGNU, as described [74]here.
2.4 How do I know if it works?
libstdc++-v3 comes with its own testsuite. You do not need to actually
install the library ("make install") to run the testsuite, but you do
need DejaGNU, as described [74]here.
To run the testsuite on the library after building it, use "make
check" while in your build directory. To run the testsuite on the
library after building and installing it, use "make check-install"
instead.
To run the testsuite on the library after building it, use "make
check" while in your build directory. To run the testsuite on the
library after building and installing it, use "make check-install"
instead.
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, please write
up your idea and send it to the list!
_________________________________________________________________
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, please write
up your idea and send it to the list!
_________________________________________________________________
2.5 This library is HUGE! And what's libsupc++?
Usually the size of libraries on disk isn't noticeable. When a link
2.5 This library is HUGE! And what's libsupc++?
Usually the size of libraries on disk isn't noticeable. When a link
object file is extracted. (There's nothing unique to C++ or
libstdc++-v3 about this; it's just common behavior, given here for
background reasons.)
object file is extracted. (There's nothing unique to C++ or
libstdc++-v3 about this; it's just common behavior, given here for
background reasons.)
Some of the object files which make up libstdc++.a are rather large.
If you create a statically-linked executable with -static, those large
object files are suddenly part of your executable. Historically the
Some of the object files which make up libstdc++.a are rather large.
If you create a statically-linked executable with -static, those large
object files are suddenly part of your executable. Historically the
files in question contain template classes and template functions,
pre-instantiated, and splitting those up causes severe maintenance
headaches.
files in question contain template classes and template functions,
pre-instantiated, and splitting those up causes severe maintenance
headaches.
It's not a bug, and it's not really a problem. Nevertheless, some
people don't like it, so here are two pseudo-solutions:
It's not a bug, and it's not really a problem. Nevertheless, some
people don't like it, so here are two pseudo-solutions:
If the only functions from libstdc++.a which you need are language
support functions (those listed in [75]clause 18 of the standard,
e.g., new and delete), then try linking against libsupc++.a (usually
If the only functions from libstdc++.a which you need are language
support functions (those listed in [75]clause 18 of the standard,
e.g., new and delete), then try linking against libsupc++.a (usually
file. But if you are using anything from the rest of the library, such
as IOStreams or vectors, then you'll still need pieces from
libstdc++.a.
file. But if you are using anything from the rest of the library, such
as IOStreams or vectors, then you'll still need pieces from
libstdc++.a.
The second method is one we hope to incorporate into the library build
process. Some platforms can place each function and variable into its
own section in a .o file. The GNU linker can then perform garbage
collection on unused sections; this reduces the situation to only
copying needed functions into the executable, as before, but all
happens automatically.
The second method is one we hope to incorporate into the library build
process. Some platforms can place each function and variable into its
own section in a .o file. The GNU linker can then perform garbage
collection on unused sections; this reduces the situation to only
copying needed functions into the executable, as before, but all
happens automatically.
Unfortunately the garbage collection in GNU ld is buggy; sections
(corresponding to functions and variables) which are used are
mistakenly removed, leading to horrible crashes when your executable
starts up. For the time being, this feature is not used when building
the library.
_________________________________________________________________
Unfortunately the garbage collection in GNU ld is buggy; sections
(corresponding to functions and variables) which are used are
mistakenly removed, leading to horrible crashes when your executable
starts up. For the time being, this feature is not used when building
the library.
_________________________________________________________________
3.0 Platform-Specific Issues
3.0 Platform-Specific Issues
3.1 Can libstdc++-v3 be used with <my favorite compiler>?
Probably not. Yet.
3.1 Can libstdc++-v3 be used with <my favorite compiler>?
Probably not. Yet.
Because GCC advances so rapidly, development and testing of libstdc++
is being done almost entirely under that compiler. If you are curious
about whether other, lesser compilers (*grin*) support libstdc++, you
Because GCC advances so rapidly, development and testing of libstdc++
is being done almost entirely under that compiler. If you are curious
about whether other, lesser compilers (*grin*) support libstdc++, you
(see above) will still require certain tools, however. Also keep in
mind that building libstdc++ does not imply that your compiler will be
able to use all of the features found in the C++ Standard Library.
(see above) will still require certain tools, however. Also keep in
mind that building libstdc++ does not imply that your compiler will be
able to use all of the features found in the C++ Standard Library.
Since the goal of ISO Standardization is for all C++ implementations
to be able to share code, the final libstdc++ should, in theory, be
usable under any ISO-compliant compiler. It will still be targeted and
optimized for GCC/g++, however.
_________________________________________________________________
Since the goal of ISO Standardization is for all C++ implementations
to be able to share code, the final libstdc++ should, in theory, be
usable under any ISO-compliant compiler. It will still be targeted and
optimized for GCC/g++, however.
_________________________________________________________________
3.2 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
3.2 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
3.3 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
3.3 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
3.4 I can't use 'long long' on Solaris
By default we try to support the C99 long long type. This requires
that certain functions from your C library be present.
3.4 I can't use 'long long' on Solaris
By default we try to support the C99 long long type. This requires
that certain functions from your C library be present.
Up through release 3.0.2 the tests performed were too general, and
this feature was disabled when it did not need to be. The most
commonly reported platform affected was Solaris.
Up through release 3.0.2 the tests performed were too general, and
this feature was disabled when it did not need to be. The most
commonly reported platform affected was Solaris.
This has been fixed for 3.0.3 and onwards.
_________________________________________________________________
This has been fixed for 3.0.3 and onwards.
_________________________________________________________________
3.5 _XOPEN_SOURCE / _GNU_SOURCE / etc is always defined
On Solaris, g++ (but not gcc) always defines the preprocessor macro
_XOPEN_SOURCE. On GNU/Linux, the same happens with _GNU_SOURCE. (This
is not an exhaustive list; other macros and other platforms are also
affected.)
3.5 _XOPEN_SOURCE / _GNU_SOURCE / etc is always defined
On Solaris, g++ (but not gcc) always defines the preprocessor macro
_XOPEN_SOURCE. On GNU/Linux, the same happens with _GNU_SOURCE. (This
is not an exhaustive list; other macros and other platforms are also
affected.)
These macros are typically used in C library headers, guarding new
versions of functions from their older versions. The C++ standard
library includes the C standard library, but it requires the C90
version, which for backwards-compatability reasons is often not the
default for many vendors.
These macros are typically used in C library headers, guarding new
versions of functions from their older versions. The C++ standard
library includes the C standard library, but it requires the C90
version, which for backwards-compatability reasons is often not the
default for many vendors.
More to the point, the C++ standard requires behavior which is only
available on certain platforms after certain symbols are defined.
Usually the issue involves I/O-related typedefs. In order to ensure
correctness, the compiler simply predefines those symbols.
More to the point, the C++ standard requires behavior which is only
available on certain platforms after certain symbols are defined.
Usually the issue involves I/O-related typedefs. In order to ensure
correctness, the compiler simply predefines those symbols.
Note that it's not enough to #define them only when the library is
being built (during installation). Since we don't have an 'export'
keyword, much of the library exists as headers, which means that the
symbols must also be defined as your programs are parsed and compiled.
Note that it's not enough to #define them only when the library is
being built (during installation). Since we don't have an 'export'
keyword, much of the library exists as headers, which means that the
symbols must also be defined as your programs are parsed and compiled.
To see which symbols are defined, look for CPLUSPLUS_CPP_SPEC in the
gcc config headers for your target (and try changing them to see what
happens when building complicated code). You can also run "g++ -E -dM
- < /dev/null" to display a list of predefined macros for any
particular installation.
To see which symbols are defined, look for CPLUSPLUS_CPP_SPEC in the
gcc config headers for your target (and try changing them to see what
happens when building complicated code). You can also run "g++ -E -dM
- < /dev/null" to display a list of predefined macros for any
particular installation.
This has been discussed on the mailing lists [76]quite a bit.
This has been discussed on the mailing lists [76]quite a bit.
This method is something of a wart. We'd like to find a cleaner
solution, but nobody yet has contributed the time.
_________________________________________________________________
This method is something of a wart. We'd like to find a cleaner
solution, but nobody yet has contributed the time.
_________________________________________________________________
3.6 OS X ctype.h is broken! How can I hack it?
This is a long-standing bug in the OS X support. Fortunately, the
patch is quite simple, and well-known. [77]Here's a link to the
solution.
_________________________________________________________________
3.6 OS X ctype.h is broken! How can I hack it?
This is a long-standing bug in the OS X support. Fortunately, the
patch is quite simple, and well-known. [77]Here's a link to the
solution.
_________________________________________________________________
3.7 Threading is broken on i386
Support for atomic integer operations is/was broken on i386 platforms.
3.7 Threading is broken on i386
Support for atomic integer operations is/was broken on i386 platforms.
i386-linux, but actually used the programs on an i686, then you would
encounter no problems. Only when actually running the code on a i386
will the problem appear.
i386-linux, but actually used the programs on an i686, then you would
encounter no problems. Only when actually running the code on a i386
will the problem appear.
This is fixed in 3.2.2.
_________________________________________________________________
This is fixed in 3.2.2.
_________________________________________________________________
3.8 Recent GNU/Linux glibc required?
When running on GNU/Linux, libstdc++ 3.2.1 (shared library version
3.8 Recent GNU/Linux glibc required?
When running on GNU/Linux, libstdc++ 3.2.1 (shared library version
C library (glibc) version 2.2.5. That version of glibc is over a year
old and contains necessary bugfixes. Many GNU/Linux distros make glibc
version 2.3.x available now.
C library (glibc) version 2.2.5. That version of glibc is over a year
old and contains necessary bugfixes. Many GNU/Linux distros make glibc
version 2.3.x available now.
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.)
_________________________________________________________________
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.)
_________________________________________________________________
3.9 Can't use wchar_t/wstring on FreeBSD
At the moment there are a few problems in FreeBSD's support for wide
3.9 Can't use wchar_t/wstring on FreeBSD
At the moment there are a few problems in FreeBSD's support for wide
that wchar_t support should be disabled. Once the underlying problems
are fixed in FreeBSD (soon), the library support will automatically
enable itself.
that wchar_t support should be disabled. Once the underlying problems
are fixed in FreeBSD (soon), the library support will automatically
enable itself.
You can fix the problems yourself, and learn more about the situation,
by reading [78]this short thread ("_GLIBCPP_USE_WCHAR_T undefined in
FreeBSD's c++config.h?").
_________________________________________________________________
You can fix the problems yourself, and learn more about the situation,
by reading [78]this short thread ("_GLIBCPP_USE_WCHAR_T undefined in
FreeBSD's c++config.h?").
_________________________________________________________________
3.10 MIPS atomic operations
The atomic locking routines for MIPS targets requires MIPS II and
later. A patch went in just after the 3.3 release to make mips* use
the generic implementation instead. You can also configure for
mipsel-elf as a workaround.
3.10 MIPS atomic operations
The atomic locking routines for MIPS targets requires MIPS II and
later. A patch went in just after the 3.3 release to make mips* use
the generic implementation instead. You can also configure for
mipsel-elf as a workaround.
mips*-*-linux* continues to use the MIPS II routines, and more work in
this area is expected.
_________________________________________________________________
mips*-*-linux* continues to use the MIPS II routines, and more work in
this area is expected.
_________________________________________________________________
4.0 Known Bugs and Non-Bugs
4.0 Known Bugs and Non-Bugs
Note that this section can get rapdily outdated -- such is the nature
of an open-source project. For the latest information, join the
mailing list or look through recent archives. The RELEASE- NOTES and
BUGS files are generally kept up-to-date.
Note that this section can get rapdily outdated -- such is the nature
of an open-source project. For the latest information, join the
mailing list or look through recent archives. The RELEASE- NOTES and
BUGS files are generally kept up-to-date.
For 3.0.1, the most common "bug" is an apparently missing "../" in
include/Makefile, resulting in files like gthr.h and gthr-single.h not
being found. Please read [79]the configuration instructions for GCC,
For 3.0.1, the most common "bug" is an apparently missing "../" in
include/Makefile, resulting in files like gthr.h and gthr-single.h not
being found. Please read [79]the configuration instructions for GCC,
and how strongly recommended it is. Building in the source directory
is fragile, is rarely tested, and tends to break, as in this case.
This was fixed for 3.0.2.
and how strongly recommended it is. Building in the source directory
is fragile, is rarely tested, and tends to break, as in this case.
This was fixed for 3.0.2.
For 3.1, the most common "bug" is a parse error when using <fstream>,
ending with a message, "bits/basic_file.h:52: parse error before `{'
token." Please read [80]the installation instructions for GCC,
For 3.1, the most common "bug" is a parse error when using <fstream>,
ending with a message, "bits/basic_file.h:52: parse error before `{'
token." Please read [80]the installation instructions for GCC,
older versions. If you install 3.1 over a 3.0.x release, then the
wrong basic_file.h header will be found (its location changed between
releases).
older versions. If you install 3.1 over a 3.0.x release, then the
wrong basic_file.h header will be found (its location changed between
releases).
Please do not report these as bugs. We know about them. Reporting this
-- or any other problem that's already been fixed -- hinders the
development of GCC, because we have to take time to respond to your
report. Thank you.
Please do not report these as bugs. We know about them. Reporting this
-- or any other problem that's already been fixed -- hinders the
development of GCC, because we have to take time to respond to your
report. Thank you.
4.1 What works already?
Short answer: Pretty much everything works except for some corner
cases. Also, localization is incomplete. For whether it works well, or
as you expect it to work, see 5.2.
4.1 What works already?
Short answer: Pretty much everything works except for some corner
cases. Also, localization is incomplete. For whether it works well, or
as you expect it to work, see 5.2.
Long answer: See the docs/html/17_intro/CHECKLIST file, which is badly
outdated...
Long answer: See the docs/html/17_intro/CHECKLIST file, which is badly
outdated...
What follows is a verbatim clip from the "Status" section of the
RELEASE-NOTES for the latest snapshot. For a list of fixed bugs, see
that file.
New:
_________________________________________________________________
What follows is a verbatim clip from the "Status" section of the
RELEASE-NOTES for the latest snapshot. For a list of fixed bugs, see
that file.
New:
_________________________________________________________________
4.2 Bugs in gcc/g++ (not libstdc++-v3)
This is by no means meant to be complete nor exhaustive, but mentions
some problems that users may encounter when building or using
libstdc++. If you are experiencing one of these problems, you can find
more information on the libstdc++ and the GCC mailing lists.
4.2 Bugs in gcc/g++ (not libstdc++-v3)
This is by no means meant to be complete nor exhaustive, but mentions
some problems that users may encounter when building or using
libstdc++. If you are experiencing one of these problems, you can find
more information on the libstdc++ and the GCC mailing lists.
Before reporting a bug, examine the [81]bugs database with the
category set to "libstdc++". The BUGS file in the source tree also
tracks known serious problems.
Before reporting a bug, examine the [81]bugs database with the
category set to "libstdc++". The BUGS file in the source tree also
tracks known serious problems.
default on your platform. Also, [82]changing your GDB settings can
have a profound effect on your C++ debugging experiences. :-)
_________________________________________________________________
default on your platform. Also, [82]changing your GDB settings can
have a profound effect on your C++ debugging experiences. :-)
_________________________________________________________________
4.3 Bugs in the C++ language/lib specification
Yes, unfortunately, there are some. In a [83]message to the list,
4.3 Bugs in the C++ language/lib specification
Yes, unfortunately, there are some. In a [83]message to the list,
concern the library. The list itself is [84]posted on his website.
Developers who are having problems interpreting the Standard may wish
to consult his notes.
concern the library. The list itself is [84]posted on his website.
Developers who are having problems interpreting the Standard may wish
to consult his notes.
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 [85]here.
Some of these have resulted in [86]code changes.
_________________________________________________________________
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 [85]here.
Some of these have resulted in [86]code changes.
_________________________________________________________________
4.4 Things in libstdc++ that only look like bugs
There are things which are not bugs in the compiler (4.2) nor the
language specification (4.3), but aren't really bugs in libstdc++,
either. Really! Please do not report these as bugs.
4.4 Things in libstdc++ that only look like bugs
There are things which are not bugs in the compiler (4.2) nor the
language specification (4.3), but aren't really bugs in libstdc++,
either. Really! Please do not report these as bugs.
-Weffc++ The biggest of these is the quadzillions of warnings about
the library headers emitted when -Weffc++ is used. Making libstdc++
"-Weffc++-clean" is not a goal of the project, for a few reasons.
Mainly, that option tries to enforce object-oriented programming,
while the Standard Library isn't necessarily trying to be OO.
-Weffc++ The biggest of these is the quadzillions of warnings about
the library headers emitted when -Weffc++ is used. Making libstdc++
"-Weffc++-clean" is not a goal of the project, for a few reasons.
Mainly, that option tries to enforce object-oriented programming,
while the Standard Library isn't necessarily trying to be OO.
reopening a stream fails Did I just say that -Weffc++ was our biggest
false-bug report? I lied. (It used to be.) Today it seems to be
reports that after executing a sequence like
reopening a stream fails Did I just say that -Weffc++ was our biggest
false-bug report? I lied. (It used to be.) Today it seems to be
reports that after executing a sequence like
unchanged. You must insert a call to fs.clear() between the calls to
close() and open(), and then everything will work like we all expect
it to work.
unchanged. You must insert a call to fs.clear() between the calls to
close() and open(), and then everything will work like we all expect
it to work.
rel_ops Another is the rel_ops namespace and the template comparison
operator functions contained therein. If they become visible in the
same namespace as other comparison functions (e.g., 'using' them and
rel_ops Another is the rel_ops namespace and the template comparison
operator functions contained therein. If they become visible in the
same namespace as other comparison functions (e.g., 'using' them and
numbers of ambiguity errors. This was discussed on the -v3 list;
Nathan Myers [88]sums things up here. The collisions with
vector/string iterator types have been fixed for 3.1.
numbers of ambiguity errors. This was discussed on the -v3 list;
Nathan Myers [88]sums things up here. The collisions with
vector/string iterator types have been fixed for 3.1.
The g++-3 headers are not ours
The g++-3 headers are not ours
If you have found an extremely broken header file which is causing
problems for you, look carefully before submitting a "high" priority
bug report (which you probably shouldn't do anyhow; see the last
paragraph of the page describing [89]the GCC bug database).
If you have found an extremely broken header file which is causing
problems for you, look carefully before submitting a "high" priority
bug report (which you probably shouldn't do anyhow; see the last
paragraph of the page describing [89]the GCC bug database).
If the headers are in ${prefix}/include/g++-3, or if the installed
library's name looks like libstdc++-2.10.a or libstdc++-libc6-2.10.so,
then you are using the old libstdc++-v2 library, which is nonstandard
and unmaintained. Do not report problems with -v2 to the -v3 mailing
list.
If the headers are in ${prefix}/include/g++-3, or if the installed
library's name looks like libstdc++-2.10.a or libstdc++-libc6-2.10.so,
then you are using the old libstdc++-v2 library, which is nonstandard
and unmaintained. Do not report problems with -v2 to the -v3 mailing
list.
For GCC versions 3.0 and 3.1 the libstdc++-v3 header files are
installed in ${prefix}/include/g++-v3 (see the 'v'?). Starting with
version 3.2 the headers are installed in
${prefix}/include/c++/${version} as this prevents headers from
previous versions being found by mistake.
For GCC versions 3.0 and 3.1 the libstdc++-v3 header files are
installed in ${prefix}/include/g++-v3 (see the 'v'?). Starting with
version 3.2 the headers are installed in
${prefix}/include/c++/${version} as this prevents headers from
previous versions being found by mistake.
glibc If you're on a GNU/Linux system and have just upgraded to glibc
2.2, but are still using gcc 2.95.2, then you should have read the
glibc FAQ, specifically 2.34:
glibc If you're on a GNU/Linux system and have just upgraded to glibc
2.2, but are still using gcc 2.95.2, then you should have read the
glibc FAQ, specifically 2.34:
Note that 2.95.x shipped with the [90]old v2 library which is no
longer maintained. Also note that gcc 2.95.3 fixes this problem, but
requires a separate patch for libstdc++-v3.
Note that 2.95.x shipped with the [90]old v2 library which is no
longer maintained. Also note that gcc 2.95.3 fixes this problem, but
requires a separate patch for libstdc++-v3.
concept checks If you see compilation errors containing messages about
fooConcept and a constraints member function, then most likely you
have violated one of the requirements for types used during
concept checks If you see compilation errors containing messages about
fooConcept and a constraints member function, then most likely you
have violated one of the requirements for types used during
EqualityComparableConcept appears if your types must be comparable
with == and you have not provided this capability (a typo, or wrong
visibility, or you just plain forgot, etc).
EqualityComparableConcept appears if your types must be comparable
with == and you have not provided this capability (a typo, or wrong
visibility, or you just plain forgot, etc).
More information, including how to optionally enable/disable the
checks, is available [91]here.
More information, including how to optionally enable/disable the
checks, is available [91]here.
dlopen/dlsym If you are using the C++ library across
dynamically-loaded objects, make certain that you are passing the
correct options when compiling and linking:
dlopen/dlsym If you are using the C++ library across
dynamically-loaded objects, make certain that you are passing the
correct options when compiling and linking:
want to test the library for memory leaks please read [93]Tips for
memory leak hunting first.
_________________________________________________________________
want to test the library for memory leaks please read [93]Tips for
memory leak hunting first.
_________________________________________________________________
4.5 Aw, that's easy to fix!
If you have found a bug in the library and you think you have a
4.5 Aw, that's easy to fix!
If you have found a bug in the library and you think you have a
you should also send the patch to our mailing list in addition to the
GCC patches mailing list. The libstdc++ [95]contributors' page also
talks about how to submit patches.
you should also send the patch to our mailing list in addition to the
GCC patches mailing list. The libstdc++ [95]contributors' page also
talks about how to submit patches.
In addition to the description, the patch, and the ChangeLog entry, it
is a Good Thing if you can additionally create a small test program to
test for the presence of the bug that your patch fixes. Bugs have a
In addition to the description, the patch, and the ChangeLog entry, it
is a Good Thing if you can additionally create a small test program to
test for the presence of the bug that your patch fixes. Bugs have a
caught immediately by the [96]testsuite -- but only if such a test
exists.
_________________________________________________________________
caught immediately by the [96]testsuite -- but only if such a test
exists.
_________________________________________________________________
5.1 string::iterator is not char*; vector<T>::iterator is not T*
If you have code that depends on container<T> iterators being
implemented as pointer-to-T, your code is broken.
5.1 string::iterator is not char*; vector<T>::iterator is not T*
If you have code that depends on container<T> iterators being
implemented as pointer-to-T, your code is broken.
While there are arguments for iterators to be implemented in that
manner, A) they aren't very good ones in the long term, and B) they
were never guaranteed by the Standard anyway. The type-safety achieved
by making iterators a real class rather than a typedef for T*
outweighs nearly all opposing arguments.
While there are arguments for iterators to be implemented in that
manner, A) they aren't very good ones in the long term, and B) they
were never guaranteed by the Standard anyway. The type-safety achieved
by making iterators a real class rather than a typedef for T*
outweighs nearly all opposing arguments.
Code which does assume that a vector iterator i is a pointer can often
be fixed by changing i in certain expressions to &*i . Future
revisions of the Standard are expected to bless this usage for
vector<> (but not for basic_string<>).
_________________________________________________________________
Code which does assume that a vector iterator i is a pointer can often
be fixed by changing i in certain expressions to &*i . Future
revisions of the Standard are expected to bless this usage for
vector<> (but not for basic_string<>).
_________________________________________________________________
5.2 What's next after libstdc++-v3?
Hopefully, not much. The goal of libstdc++-v3 is to produce a
5.2 What's next after libstdc++-v3?
Hopefully, not much. The goal of libstdc++-v3 is to produce a
they seem to be "standard" enough. (For example, the "long long"
type from C99.) Bugfixes and rewrites (to improve or fix thread
safety, for instance) will of course be a continuing task.
they seem to be "standard" enough. (For example, the "long long"
type from C99.) Bugfixes and rewrites (to improve or fix thread
safety, for instance) will of course be a continuing task.
[98]This question about the next libstdc++ prompted some brief but
interesting [99]speculation.
_________________________________________________________________
[98]This question about the next libstdc++ prompted some brief but
interesting [99]speculation.
_________________________________________________________________
5.3 What about the STL from SGI?
The [100]STL from SGI, version 3.3, was the most recent merge of the
STL codebase. The code in libstdc++ contains many fixes and changes,
and it is very likely that the SGI code is no longer under active
development. We expect that no future merges will take place.
5.3 What about the STL from SGI?
The [100]STL from SGI, version 3.3, was the most recent merge of the
STL codebase. The code in libstdc++ contains many fixes and changes,
and it is very likely that the SGI code is no longer under active
development. We expect that no future merges will take place.
In particular, string is not from SGI and makes no use of their "rope"
class (which is included as an optional extension), nor is valarray
and some others. Classes like vector<> are, however we have made
significant changes to them since then.
In particular, string is not from SGI and makes no use of their "rope"
class (which is included as an optional extension), nor is valarray
and some others. Classes like vector<> are, however we have made
significant changes to them since then.
The FAQ for SGI's STL (one jump off of their main page) is recommended
reading.
_________________________________________________________________
The FAQ for SGI's STL (one jump off of their main page) is recommended
reading.
_________________________________________________________________
5.4 Extensions and Backward Compatibility
Headers in the ext and backward subdirectories should be referred to
5.4 Extensions and Backward Compatibility
Headers in the ext and backward subdirectories should be referred to
forward-compatible. (The situation is the same as that of other
headers whose directories are not searched directly, e.g.,
<sys/stat.h>, <X11/Xlib.h>.
forward-compatible. (The situation is the same as that of other
headers whose directories are not searched directly, e.g.,
<sys/stat.h>, <X11/Xlib.h>.
The extensions are no longer in the global or std namespaces, instead
they are declared in the __gnu_cxx namespace. For maximum portability,
consider defining a namespace alias to use to talk about extensions,
The extensions are no longer in the global or std namespaces, instead
they are declared in the __gnu_cxx namespace. For maximum portability,
consider defining a namespace alias to use to talk about extensions,
This is a bit cleaner than defining typedefs for all the
instantiations you might need.
This is a bit cleaner than defining typedefs for all the
instantiations you might need.
Extensions to the library have [101]their own page.
_________________________________________________________________
Extensions to the library have [101]their own page.
_________________________________________________________________
5.5 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
5.5 [removed]
This question has become moot and has been removed. The stub is here
to preserve numbering (and hence links/bookmarks).
_________________________________________________________________
5.6 Is libstdc++-v3 thread-safe?
libstdc++-v3 strives to be thread-safe when all of the following
5.6 Is libstdc++-v3 thread-safe?
libstdc++-v3 strives to be thread-safe when all of the following
* gcc -v reports a thread model other than 'single',
* [pre-3.3 only] a non-generic implementation of atomicity.h exists
for the architecture in question.
* gcc -v reports a thread model other than 'single',
* [pre-3.3 only] a non-generic implementation of atomicity.h exists
for the architecture in question.
The user-code must guard against concurrent method calls which may
access any particular library object's state. Typically, the
application programmer may infer what object locks must be held based
The user-code must guard against concurrent method calls which may
access any particular library object's state. Typically, the
application programmer may infer what object locks must be held based
both read and write access to objects; unless otherwise documented as
safe, do not assume that two threads may access a shared standard
library object at the same time.
both read and write access to objects; unless otherwise documented as
safe, do not assume that two threads may access a shared standard
library object at the same time.
See chapters [102]17 (library introduction), [103]23 (containers), and
[104]27 (I/O) for more information.
_________________________________________________________________
See chapters [102]17 (library introduction), [103]23 (containers), and
[104]27 (I/O) for more information.
_________________________________________________________________
5.7 How do I get a copy of the ISO C++ Standard?
Copies of the full ISO 14882 standard are available on line via the
5.7 How do I get a copy of the ISO C++ Standard?
Copies of the full ISO 14882 standard are available on line via the
right [105]here. (And if you've already registered with them, clicking
this link will take you to directly to the place where you can
[106]buy the standard on-line.
right [105]here. (And if you've already registered with them, clicking
this link will take you to directly to the place where you can
[106]buy the standard on-line.
Who is your country's member body? Visit the [107]ISO homepage and
find out!
_________________________________________________________________
Who is your country's member body? Visit the [107]ISO homepage and
find out!
_________________________________________________________________
5.8 What's an ABI and why is it so messy?
"ABI" stands for "Application Binary Interface." Conventionally, it
5.8 What's an ABI and why is it so messy?
"ABI" stands for "Application Binary Interface." Conventionally, it
one ABI and all the OSes and compilers use it. In practice every ABI
omits details that compiler implementers (consciously or accidentally)
must choose for themselves.
one ABI and all the OSes and compilers use it. In practice every ABI
omits details that compiler implementers (consciously or accidentally)
must choose for themselves.
That ABI definition suffices for compilers to generate code so a
program can interact safely with an OS and its lowest-level libraries.
Users usually want an ABI to encompass more detail, allowing libraries
That ABI definition suffices for compilers to generate code so a
program can interact safely with an OS and its lowest-level libraries.
Users usually want an ABI to encompass more detail, allowing libraries
C++, and is immediately useful for embedded work relying only on a
"free-standing implementation" that doesn't include (much of) the
standard library. It is a good basis for the work to come.
C++, and is immediately useful for embedded work relying only on a
"free-standing implementation" that doesn't include (much of) the
standard library. It is a good basis for the work to come.
A useful C++ ABI must also incorporate many details of the standard
library implementation. For a C ABI, the layouts of a few structs
(such as FILE, stat, jmpbuf, and the like) and a few macros suffice.
A useful C++ ABI must also incorporate many details of the standard
library implementation. For a C ABI, the layouts of a few structs
(such as FILE, stat, jmpbuf, and the like) and a few macros suffice.
documenting library implementation details, but carefully designing
those details so that future bug fixes and optimizations don't force
breaking the ABI.
documenting library implementation details, but carefully designing
those details so that future bug fixes and optimizations don't force
breaking the ABI.
There are ways to help isolate library implementation details from the
ABI, but they trade off against speed. Library details used in inner
loops (e.g., getchar) must be exposed and frozen for all time, but
There are ways to help isolate library implementation details from the
ABI, but they trade off against speed. Library details used in inner
loops (e.g., getchar) must be exposed and frozen for all time, but
happen before you can reasonably document a candidate C++ ABI that
encompasses the standard library.
_________________________________________________________________
happen before you can reasonably document a candidate C++ ABI that
encompasses the standard library.
_________________________________________________________________
See [108]license.html for copying conditions. Comments and suggestions
are welcome, and may be sent to [109]the libstdc++ mailing list.
See [108]license.html for copying conditions. Comments and suggestions
are welcome, and may be sent to [109]the libstdc++ mailing list.
97. ../ext/howto.html#5
98. http://gcc.gnu.org/ml/libstdc++/1999/msg00080.html
99. http://gcc.gnu.org/ml/libstdc++/1999/msg00084.html
97. ../ext/howto.html#5
98. http://gcc.gnu.org/ml/libstdc++/1999/msg00080.html
99. http://gcc.gnu.org/ml/libstdc++/1999/msg00084.html
- 100. http://www.sgi.com/Technology/STL/
+ 100. http://www.sgi.com/tech/stl/
101. ../ext/howto.html
102. ../17_intro/howto.html#3
103. ../23_containers/howto.html#3
101. ../ext/howto.html
102. ../17_intro/howto.html#3
103. ../23_containers/howto.html#3
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