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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.
This commit is contained in:
Rolf Eike Beer 2012-02-24 17:48:02 +01:00
parent 4412fc0890
commit c28e276948
1 changed files with 9 additions and 28 deletions
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29
Modules/GenerateExportHeader.cmake
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@ -154,35 +154,16 @@ endmacro()
macro(_test_compiler_hidden_visibility)
if(CMAKE_COMPILER_IS_GNUCXX)
exec_program(${CMAKE_C_COMPILER} ARGS --version
OUTPUT_VARIABLE _gcc_version_info)
string(REGEX MATCH "[345]\\.[0-9]\\.[0-9]"
_gcc_version "${_gcc_version_info}")
# gcc on mac just reports: "gcc (GCC) 3.3 20030304 ..." without the
# patch level, handle this here:
if(NOT _gcc_version)
string(REGEX REPLACE ".*\\(GCC\\).* ([34]\\.[0-9]) .*" "\\1.0"
_gcc_version "${_gcc_version_info}")
endif()
if("${_gcc_version}" VERSION_LESS "4.2")
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
message(WARNING "GCC version older than 4.2")
endif()
endif()
if(CMAKE_CXX_COMPILER_ID MATCHES Intel)
exec_program(${CMAKE_CXX_COMPILER} ARGS -V
OUTPUT_VARIABLE _intel_version_info)
string(REGEX REPLACE ".*Version ([0-9]+(\\.[0-9]+)+).*" "\\1"
_intel_version "${_intel_version_info}")
if(${_intel_version} VERSION_LESS "12.0")
elseif(CMAKE_COMPILER_IS_GNUC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
set(GCC_TOO_OLD TRUE)
message(WARNING "GCC version older than 4.2")
elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
set(_INTEL_TOO_OLD TRUE)
message(WARNING "Intel compiler older than 12.0")
endif()
endif()
# Exclude XL here because it misinterprets -fvisibility=hidden even though