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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
34 lines
1.4 KiB
CMake
34 lines
1.4 KiB
CMake
set(CMake_C11_THREAD_LOCAL_BROKEN 0)
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if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND CMAKE_C11_STANDARD_COMPILE_OPTION)
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if(NOT DEFINED CMake_C11_THREAD_LOCAL_WORKS)
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message(STATUS "Checking if compiler supports C11 _Thread_local")
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try_compile(CMake_C11_THREAD_LOCAL_WORKS
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${CMAKE_CURRENT_BINARY_DIR}
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${CMAKE_CURRENT_LIST_DIR}/cm_c11_thread_local.c
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CMAKE_FLAGS -DCMAKE_C_STANDARD=11
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OUTPUT_VARIABLE OUTPUT
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)
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if(CMake_C11_THREAD_LOCAL_WORKS AND "${OUTPUT}" MATCHES "error: expected '=', ',', ';', 'asm' or '__attribute__' before 'int'")
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set_property(CACHE CMake_C11_THREAD_LOCAL_WORKS PROPERTY VALUE 0)
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endif()
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if(CMake_C11_THREAD_LOCAL_WORKS)
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message(STATUS "Checking if compiler supports C11 _Thread_local - yes")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if compiler supports C11 _Thread_local passed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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else()
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message(STATUS "Checking if compiler supports C11 _Thread_local - no")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if compiler supports C11 _Thread_local failed with the following output:\n"
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"${OUTPUT}\n"
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"\n"
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)
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endif()
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endif()
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if(NOT CMake_C11_THREAD_LOCAL_WORKS)
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set(CMake_C11_THREAD_LOCAL_BROKEN 1)
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endif()
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endif()
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