GenerateExportHeader: improve compiler identification
Use CMAKE_<LANG>_COMPILER_VERSION instead of calling the compiler. This macro predates those useful variables. This also fixes the issue that g++ version detection was not working if C language was not enabled.
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@ -154,34 +154,15 @@ endmacro()
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macro(_test_compiler_hidden_visibility)
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if(CMAKE_COMPILER_IS_GNUCXX)
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exec_program(${CMAKE_C_COMPILER} ARGS --version
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OUTPUT_VARIABLE _gcc_version_info)
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string(REGEX MATCH "[345]\\.[0-9]\\.[0-9]"
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_gcc_version "${_gcc_version_info}")
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# gcc on mac just reports: "gcc (GCC) 3.3 20030304 ..." without the
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# patch level, handle this here:
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if(NOT _gcc_version)
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string(REGEX REPLACE ".*\\(GCC\\).* ([34]\\.[0-9]) .*" "\\1.0"
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_gcc_version "${_gcc_version_info}")
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endif()
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if("${_gcc_version}" VERSION_LESS "4.2")
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set(GCC_TOO_OLD TRUE)
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message(WARNING "GCC version older than 4.2")
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endif()
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endif()
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if(CMAKE_CXX_COMPILER_ID MATCHES Intel)
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exec_program(${CMAKE_CXX_COMPILER} ARGS -V
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OUTPUT_VARIABLE _intel_version_info)
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string(REGEX REPLACE ".*Version ([0-9]+(\\.[0-9]+)+).*" "\\1"
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_intel_version "${_intel_version_info}")
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if(${_intel_version} VERSION_LESS "12.0")
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set(_INTEL_TOO_OLD TRUE)
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message(WARNING "Intel compiler older than 12.0")
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endif()
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if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
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set(GCC_TOO_OLD TRUE)
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message(WARNING "GCC version older than 4.2")
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elseif(CMAKE_COMPILER_IS_GNUC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
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set(GCC_TOO_OLD TRUE)
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message(WARNING "GCC version older than 4.2")
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elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
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set(_INTEL_TOO_OLD TRUE)
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message(WARNING "Intel compiler older than 12.0")
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endif()
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