diff options
| author | Raphael Kubo da Costa <rakuco@FreeBSD.org> | 2015-09-15 14:31:12 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2015-09-15 14:51:54 (GMT) |
| commit | ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1 (patch) | |
| tree | 3a18a85325fb2d883b0019a629ef9d69149dd5e8 /Source/Checks | |
| parent | cda189356e7e0a897377c3d7ed02ea3a3ad1de5a (diff) | |
| download | CMake-ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1.zip CMake-ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1.tar.gz CMake-ffa6f057b4ae07c9dc7b9e1d12ecc0a2e19333a1.tar.bz2 | |
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 'Source/Checks')
| -rw-r--r-- | Source/Checks/cm_c11_thread_local.c | 2 | ||||
| -rw-r--r-- | Source/Checks/cm_c11_thread_local.cmake | 33 |
2 files changed, 35 insertions, 0 deletions
diff --git a/Source/Checks/cm_c11_thread_local.c b/Source/Checks/cm_c11_thread_local.c new file mode 100644 index 0000000..ab780f2 --- /dev/null +++ b/Source/Checks/cm_c11_thread_local.c @@ -0,0 +1,2 @@ +_Thread_local int i = 42; +int main(void) { return 0; } diff --git a/Source/Checks/cm_c11_thread_local.cmake b/Source/Checks/cm_c11_thread_local.cmake new file mode 100644 index 0000000..6b8d10b --- /dev/null +++ b/Source/Checks/cm_c11_thread_local.cmake @@ -0,0 +1,33 @@ +set(CMake_C11_THREAD_LOCAL_BROKEN 0) +if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_C11_STANDARD_COMPILE_OPTION) + if(NOT DEFINED CMake_C11_THREAD_LOCAL_WORKS) + message(STATUS "Checking if compiler supports C11 _Thread_local") + try_compile(CMake_C11_THREAD_LOCAL_WORKS + ${CMAKE_CURRENT_BINARY_DIR} + ${CMAKE_CURRENT_LIST_DIR}/cm_c11_thread_local.c + CMAKE_FLAGS -DCMAKE_C_STANDARD=11 + OUTPUT_VARIABLE OUTPUT + ) + if(CMake_C11_THREAD_LOCAL_WORKS AND "${OUTPUT}" MATCHES "error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'") + set_property(CACHE CMake_C11_THREAD_LOCAL_WORKS PROPERTY VALUE 0) + endif() + if(CMake_C11_THREAD_LOCAL_WORKS) + message(STATUS "Checking if compiler supports C11 _Thread_local - yes") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log + "Determining if compiler supports C11 _Thread_local passed with the following output:\n" + "${OUTPUT}\n" + "\n" + ) + else() + message(STATUS "Checking if compiler supports C11 _Thread_local - no") + file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log + "Determining if compiler supports C11 _Thread_local failed with the following output:\n" + "${OUTPUT}\n" + "\n" + ) + endif() + endif() + if(NOT CMake_C11_THREAD_LOCAL_WORKS) + set(CMake_C11_THREAD_LOCAL_BROKEN 1) + endif() +endif() |