[CMake] wrapping a macro

[René J. V. Bertin]

Hello,

Is it possible to wrap an existing macro that returns a result via one of its 
arguments? I think it will be clear what I would like to do from the following 
example:

if(${INTRINSICS_TEST_TYPE} MATCHES "compiles")
    macro(check_intrinsics_availability source var)
        check_c_source_compiles(source var)
    endmacro()
elseif(${INTRINSICS_TEST_TYPE} MATCHES "runs")
    include(CheckCSourceRuns)
    macro(check_intrinsics_availability source var)
        check_c_source_runs(source var)
    endmacro()
elseif(${INTRINSICS_TEST_TYPE} MATCHES "none")
    macro(check_intrinsics_availability source var)
        set(${var} 1)
        set(${var}_EXITCODE 0)
    endmacro()
else()
    macro(check_intrinsics_availability source var)
        set(${var} 0)
        set(${var}_EXITCODE 1)
    endmacro()
endif()


This does not have the intended effect: when INTRINSICS_TEST_TYPE == "compiles", 
cmake prints "Performing test var - Failed". Evidently I'd like it to perform 
test ${var}, in other words, the check_intrinsics_availability macro should 
behave exactly as either check_c_source_compiles or check_c_source_runs.

Additionally, the "none" and fallback cases are supposed to behave if 
check_c_source_?? succeeded or failed, respectively. Are they implemented 
correctly?

Thanks,
R.