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94 lines
3.7 KiB
94 lines
3.7 KiB
8 years ago
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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# This module is shared by multiple languages and compilers; use include guard
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if (__COMPILER_CMAKE_COMMON_COMPILER_MACROS)
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return()
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endif ()
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set(__COMPILER_CMAKE_COMMON_COMPILER_MACROS 1)
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# Check that a compiler's language standard is properly detected
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# Parameters:
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# lang - Language to check
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# stdver1 - Minimum version to set a given default for
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# std1 - Default to use for compiler ver >= stdver1
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# stdverN - Minimum version to set a given default for
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# stdN - Default to use for compiler ver >= stdverN
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#
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# The order of stdverN stdN pairs passed as arguments is expected to be in
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# monotonically increasing version order.
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#
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# Note:
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# This macro can be called with multiple version / std pairs to convey that
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# newer compiler versions may use a newer standard default.
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#
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# Example:
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# To specify that compiler version 6.1 and newer defaults to C++11 while
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# 4.8 <= ver < 6.1 default to C++98, you would call:
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#
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# __compiler_check_default_language_standard(CXX 4.8 98 6.1 11)
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#
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macro(__compiler_check_default_language_standard lang stdver1 std1)
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set(__std_ver_pairs "${stdver1};${std1};${ARGN}")
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string(REGEX REPLACE " *; *" " " __std_ver_pairs "${__std_ver_pairs}")
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string(REGEX MATCHALL "[^ ]+ [^ ]+" __std_ver_pairs "${__std_ver_pairs}")
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# If the compiler version is below the threshold of even having CMake
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# support for language standards, then don't bother.
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if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL "${stdver1}")
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if (NOT CMAKE_${lang}_COMPILER_FORCED)
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if (NOT CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT)
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message(FATAL_ERROR "CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_${lang}_COMPILER_ID} (${CMAKE_${lang}_COMPILER}) version ${CMAKE_${lang}_COMPILER_VERSION}")
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endif ()
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set(CMAKE_${lang}_STANDARD_DEFAULT ${CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT})
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else ()
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list(REVERSE __std_ver_pairs)
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foreach (__std_ver_pair IN LISTS __std_ver_pairs)
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string(REGEX MATCH "([^ ]+) (.+)" __std_ver_pair "${__std_ver_pair}")
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set(__stdver ${CMAKE_MATCH_1})
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set(__std ${CMAKE_MATCH_2})
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if (CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL __stdver AND
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NOT DEFINED CMAKE_${lang}_STANDARD_DEFAULT)
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# Compiler id was forced so just guess the default standard level.
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set(CMAKE_${lang}_STANDARD_DEFAULT ${__std})
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endif ()
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unset(__std)
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unset(__stdver)
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endforeach ()
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endif ()
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endif ()
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unset(__std_ver_pairs)
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endmacro()
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# Define to allow compile features to be automatically determined
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macro(cmake_record_c_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_C11_STANDARD_COMPILE_OPTION)
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_record_compiler_features_c(11)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C99_STANDARD_COMPILE_OPTION)
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_record_compiler_features_c(99)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_C90_STANDARD_COMPILE_OPTION)
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_record_compiler_features_c(90)
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endif()
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endmacro()
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# Define to allow compile features to be automatically determined
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macro(cmake_record_cxx_compile_features)
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set(_result 0)
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION)
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_record_compiler_features_cxx(17)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION)
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_record_compiler_features_cxx(14)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX11_STANDARD_COMPILE_OPTION)
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_record_compiler_features_cxx(11)
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endif()
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if(_result EQUAL 0 AND DEFINED CMAKE_CXX98_STANDARD_COMPILE_OPTION)
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_record_compiler_features_cxx(98)
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endif()
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endmacro()
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