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CMake/Modules/Compiler/Clang-C.cmake

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Clang: Split Compiler/Clang* modules out from GNU (#13550) While Clang presents an almost identical interface to GNU there will be some differences. Split the compiler information modules to allow separate rules for Clang. Start by loading the GNU rules but leave a place to add Clang-specific information.
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include(Compiler/Clang)
__compiler_clang(C)
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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cmake_policy(GET CMP0025 appleClangPolicy)
if(WIN32 OR (APPLE AND NOT appleClangPolicy STREQUAL NEW))
return()
endif()
Features: Fix references to CXX compiler version in Clang-C.cmake.
2014-11-19 00:02:17 +03:00
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
endif()
Project: Determine default language dialect for the compiler. Use the __cplusplus and __STDC_VERSION__ macros to automatically determine the default dialect for the compiler while determining its id and version.
2015-09-15 20:42:26 +03:00
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
Project: Don't require computed default dialect if compiler was forced. Commit 7235334a (Project: Determine default language dialect for the compiler., 2015-09-15) introduced a mechanism to determine the default dialect used for the running compiler. If conditions in the <CompilerId>-<Lang>.cmake file are such that compile features for that version of the compiler should be supported, the _DEFAULT_STANDARD is set to the computed value. However, the CMakeForceCompiler module allows users to bypass execution of the compiler by CMake. In that case, do not set the _DEFAULT_STANDARD variable at all, which effectively disables the compile-features where the module is used. No compile features have ever been recorded where the module is used so no functionality is lost.
2015-09-22 23:13:15 +03:00
if (NOT CMAKE_C_COMPILER_FORCED)
if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
endif()
set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
Project: Guess default standard dialect if compiler was forced (#15852) Prior to commit v3.4.0-rc1~71^2 (Project: Determine default language dialect for the compiler, 2015-09-15) we always guessed the default language standard dialect based on the compiler version. This was not reliable so that commit switched to computing the default language standard dialect while detecting the compiler id. When a toolchain file uses CMakeForceCompiler to set the compiler id then the detection does not occur. Therefore commit v3.4.0-rc1~54^2 (Project: Don't require computed default dialect if compiler was forced, 2015-09-22) made the lack of detection an error only if the compiler was not forced. However, this means that projects using CMakeForceCompiler no longer even get the guess that we had before so <LANG>_COMPILER does not work. Due to the sophistication of CMake's compiler detection logic projects should be ported away from using CMakeForceCompiler. In the meantime, restore a guess of the default language standard dialect when the compiler is forced.
2015-11-19 18:12:58 +03:00
elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
# Compiler id was forced so just guess the default standard level.
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.6)
set(CMAKE_C_STANDARD_DEFAULT 11)
else()
set(CMAKE_C_STANDARD_DEFAULT 99)
endif()
Project: Determine default language dialect for the compiler. Use the __cplusplus and __STDC_VERSION__ macros to automatically determine the default dialect for the compiler while determining its id and version.
2015-09-15 20:42:26 +03:00
endif()
Features: Fix the default C dialect for Clang and GNU. Clang 3.4 uses C99 by default, and Clang 3.6 uses C11 by default: http://thread.gmane.org/gmane.comp.compilers.clang.devel/39379 GNU 4.9 uses C90 by default, and GNU 5.0 uses C11 by default: https://gcc.gnu.org/gcc-5/changes.html Test that the default compiler settings result in the expected dialect macros being defined for both C and CXX. Remove the unused main.c file from the CompileFeatures unit test.
2014-11-18 01:24:31 +03:00
endif()
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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macro(cmake_record_c_compile_features)
macro(_get_clang_features std_version list)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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record_compiler_features(C "${std_version}" ${list})
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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endmacro()
Features: Ensure appropriate return value from feature test macros. GNU-CXX already has complex logic and sets the _result to 0 before tests which may set it to something else. Change the other modules to be consistent with that.
2015-01-12 23:43:48 +03:00
set(_result 0)
Features: Fix references to CXX compiler version in Clang-C.cmake.
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if (UNIX AND NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 3.4)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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_get_clang_features(${CMAKE_C11_STANDARD_COMPILE_OPTION} CMAKE_C11_COMPILE_FEATURES)
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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if (_result EQUAL 0)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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_get_clang_features(${CMAKE_C99_STANDARD_COMPILE_OPTION} CMAKE_C99_COMPILE_FEATURES)
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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endif()
if (_result EQUAL 0)
Features: Use the correct dialect flag when recording features. Avoid using -std=c++1y for compilers which support -std=c++14, for example.
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_get_clang_features(${CMAKE_C90_STANDARD_COMPILE_OPTION} CMAKE_C90_COMPILE_FEATURES)
Features: Record for Clang 3.4 Clang 3.4 supports all features currently known to CMake.
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endif()
endif()
endmacro()