CMake/Modules/Platform/Darwin-GNU.cmake

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macro(cmake_gnu_has_isysroot lang)
if("x${CMAKE_${lang}_HAS_ISYSROOT}" STREQUAL "x")
set(_doc "${lang} compiler has -isysroot")
message(STATUS "Checking whether ${_doc}")
execute_process(
COMMAND ${CMAKE_${lang}_COMPILER} "-v" "--help"
OUTPUT_VARIABLE _gcc_help
ERROR_VARIABLE _gcc_help
)
if("${_gcc_help}" MATCHES "isysroot")
message(STATUS "Checking whether ${_doc} - yes")
set(CMAKE_${lang}_HAS_ISYSROOT 1)
else()
message(STATUS "Checking whether ${_doc} - no")
set(CMAKE_${lang}_HAS_ISYSROOT 0)
endif()
endif()
endmacro()