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enable_language (Fortran)
include(CheckCompilerFlag)
set(Fortran 1) # test that this is tolerated
check_compiler_flag(Fortran "-_this_is_not_a_flag_" SHOULD_FAIL)
if(SHOULD_FAIL)
message(SEND_ERROR "invalid Fortran compile flag didn't fail.")
endif()
if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
check_compiler_flag(Fortran "-Wall" SHOULD_WORK)
if(NOT SHOULD_WORK)
message(SEND_ERROR "${CMAKE_Fortran_COMPILER_ID} compiler flag '-Wall' check failed")
endif()
endif()
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