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| author | Raphael Kubo da Costa <rakuco@FreeBSD.org> | 2015-09-15 16:31:12 +0200 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2015-09-15 10:51:54 -0400 |
| commit | ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1 (patch) | |
| tree | 3a18a85325fb2d883b0019a629ef9d69149dd5e8 /CMakeLists.txt | |
| parent | cda189356e7e0a897377c3d7ed02ea3a3ad1de5a (diff) | |
| download | cmake-ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1.tar.gz | |
Avoid using C11 to build CMake if _Thread_local support is broken
Support for C11's _Thread_local was introduced in GCC in the 4.9 series,
even though we make the C11 compiler flags available in CMake with GCC
>= 4.6.
FreeBSD's runetype.h uses _Thread_local, which causes CMake's own build
to fail when using GCC < 4.9 and -std=gnu11:
/usr/include/runetype.h:92:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'const'
extern _Thread_local const _RuneLocale *_ThreadRuneLocale;
Add a test for _Thread_local support and only build CMake itself with
C11 support if it works.
Bug: http://www.cmake.org/Bug/view.php?id=15741
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 5e13a7e0f4..94d138c3b5 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -38,7 +38,12 @@ endif() # Use most-recent available language dialects with GNU and Clang if(NOT DEFINED CMAKE_C_STANDARD AND NOT CMake_NO_C_STANDARD) - set(CMAKE_C_STANDARD 11) + include(${CMake_SOURCE_DIR}/Source/Checks/cm_c11_thread_local.cmake) + if(NOT CMake_C11_THREAD_LOCAL_BROKEN) + set(CMAKE_C_STANDARD 11) + else() + set(CMAKE_C_STANDARD 99) + endif() endif() if(NOT DEFINED CMAKE_CXX_STANDARD AND NOT CMake_NO_CXX_STANDARD) include(${CMake_SOURCE_DIR}/Source/Checks/cm_cxx14_cstdio.cmake) |