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Author SHA1 Message Date
Eric Fiselier
00f4a49b0b [libcxx] Allow use of <atomic> in C++03. Try 3. 
Summary:
After putting this question up on cfe-dev I have decided that it would be best to allow the use of `<atomic>` in C++03. Although static initialization is a concern the syntax required to get it is C++11 only. Meaning that C++11 constant static initialization cannot silently break in C++03, it will always cause a syntax error. Furthermore `ATOMIC_VAR_INIT` and `ATOMIC_FLAG_INIT` remain defined in C++03 even though they cannot be used because C++03 usages will cause better error messages.

The main change in this patch is to replace `__has_feature(cxx_atomic)`, which only returns true when C++ >= 11, to `__has_extension(c_atomic)` which returns true whenever clang supports the required atomic builtins.


This patch adds the following macros:
* `_LIBCPP_HAS_C_ATOMIC_IMP`      - Defined on clang versions which provide the C `_Atomic` keyword.
* `_LIBCPP_HAS_GCC_ATOMIC_IMP` - Defined on GCC > 4.7. We must use the fallback atomic implementation.
* `_LIBCPP_HAS_NO_ATOMIC_HEADER` - Defined when it is not safe to include `<atomic>`.

`_LIBCPP_HAS_C_ATOMIC_IMP` and `_LIBCPP_HAS_GCC_ATOMIC_IMP` are mutually exclusive, only one should be defined. If neither is defined then `<atomic>` is not implemented and including `<atomic>` will issue an error.

Reviewers: chandlerc, jroelofs, mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D11555

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@245463 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-08-19 17:21:46 +00:00
Jonathan Roelofs
baed05dd37 Address some post-commit review comments on r217261 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217276 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-09-05 20:28:44 +00:00
Jonathan Roelofs
8d86b2e686 Allow libc++ to be built on systems without POSIX threads 
If you're crazy enough to want this sort of thing, then add
-D_LIBCPP_HAS_NO_THREADS to your CXXFLAGS and
--param=additiona_features=libcpp-has-no-threads to your lit commnad line.

http://reviews.llvm.org/D3969


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@217271 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-09-05 19:45:05 +00:00
Marshall Clow
8a43fca8ed Patch by GM: Making implicit conversion to bool explicit in <ios> and <__locale> 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@193085 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-21 14:41:05 +00:00
Marshall Clow
61a8422ffa LWG Issue 2087: iostream_category() and noexcept 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192545 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-12 22:49:56 +00:00
Marshall Clow
206ce1faaf LWG issue 2143: ios_base::xalloc should be thread-safe 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192539 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-12 19:13:52 +00:00
Howard Hinnant
e064055942 G M: Rename local variable from __except to avoid MSVC keyword clash. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192072 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-10-06 21:00:29 +00:00
Howard Hinnant
0f678bd69e Nico Rieck: this patch series fixes visibility issues on Windows as explained in <http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-August/031214.html>. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@188192 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-08-12 18:38:34 +00:00
Marshall Clow
809e93f7f2 move __save_flags from <random> to <ios> in preparation for reuse; no functionality change 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@185968 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-07-09 20:34:14 +00:00
Howard Hinnant
83eade6abb No functionality change at this time. I've split _LIBCPP_VISIBLE up into two flags: _LIBCPP_TYPE_VIS and _LIBCPP_FUNC_VIS. This is in preparation for taking advantage of clang's new __type_visibility__ attribute. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@176593 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-03-06 23:30:19 +00:00
Howard Hinnant
9c0df1416f Rename uses of _ and __ because these are getting stepped on by macros from other system code. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@167038 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-30 19:06:59 +00:00
Howard Hinnant
33be35effe Dimitry Andric: many visibility fixes. Howard: Much appreciated. Can you send me a patch to CREDITS.TXT? 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@163862 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-09-14 00:39:16 +00:00
Howard Hinnant
c417a802ed Hyeon-bin Jeong: libc++ fails to create any classes inherit from basic_ios if they 
provided char type other than char or wchar_t. It throw exception during
construction, so there is no chance to imbue own ctype.

This fixes http://llvm.org/bugs/show_bug.cgi?id=13698

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@162648 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-08-26 18:05:35 +00:00
Howard Hinnant
f57bd564fd noexcept and constexpr applied to <ios>. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@160593 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-07-21 01:03:40 +00:00
Howard Hinnant
7786188d15 Modernize conversion to bool to the explicit bool conversion operator (library wide). This fixes http://llvm.org/bugs/show_bug.cgi?id=12058. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@151088 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-02-21 21:46:43 +00:00
Howard Hinnant
f6d875f7f5 Fix http://llvm.org/bugs/show_bug.cgi?id=11428. Fix provided by Alberto Ganesh Barbati 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@145698 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-12-02 19:36:40 +00:00
Howard Hinnant
08e17472e4 Windows support by Ruben Van Boxem. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@142235 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-17 20:05:10 +00:00
Howard Hinnant
0949eedbd6 _STD -> _VSTD to avoid macro clash on windows 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@134190 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-30 21:18:19 +00:00
Howard Hinnant
2d72b1e393 Effort to reduce the number of exported symbols 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@122057 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-17 14:46:43 +00:00
Howard Hinnant
b64f8b07c1 license change 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@119395 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-16 22:09:02 +00:00
Howard Hinnant
68a8e90b3d visibility-decoration. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@114545 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-22 15:29:08 +00:00
Howard Hinnant
73d21a4f07 Changed __config to react to all of clang's currently documented has_feature flags, and renamed _LIBCPP_MOVE to _LIBCPP_HAS_NO_RVALUE_REFERENCES to be more consistent with the rest of the libc++'s flags, and with clang's nomenclature. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113086 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-09-04 23:28:19 +00:00
Howard Hinnant
324bb03bb9 Fixing whitespace problems 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111750 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-08-22 00:02:43 +00:00
Howard Hinnant
f5256e16df Wiped out some non-ascii characters that snuck into the copyright. 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103516 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 21:36:01 +00:00
Howard Hinnant
bc8d3f97eb libcxx initial import 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-05-11 19:42:16 +00:00