Re: [CMake] Problem with override file ...

Wed, 15 Feb 2017 09:42:43 -0800

I found that changing the add_definitions lines to set(CMAKE_C_FLAGS_INIT ...) or set(CMAKE_CXX_FLAGS_INIT ...) resolved the issue. I have not found documentation anywhere that says "this is how it must be done".

So, is this the expected behavior when using add_definitions in an override file?

Mike


On 2/8/2017 11:50 AM, Michael Burns via CMake wrote:
Using the following override file results in the try_compile failing for
both the C compiler and the C++ compiler. The output shows that the
override file is being processed multiple times. The first time it is
processed, the variable PARAM is 'set' as specified on the CMake command
line. However, subsequent processing of the file shows that PARAM is not
'set' and results in the 'bogus-option' being added to the compiler
command line. This, of course, results in the try_compile's failing.

message(STATUS "Processing override_compiler_flags.cmake ...")

if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
    if(PARAM STREQUAL "set")
        message(AUTHOR_WARNING "PARAM is 'set' ...")
        add_definitions("-DPARAM=1")
    else()
        message(AUTHOR_WARNING "PARAM is not 'set' ...")
        add_definitions("--bogus-option")
    endif()
endif()

The CMake process is initiated with the following command line.

$ cmake -DPARAM=set ..

And, usage of the override file is set with the following before the
project is defined.

set(CMAKE_USER_MAKE_RULES_OVERRIDE
${CMAKE_CURRENT_SOURCE_DIR}/override_compiler_flags.cmake)

I have attached the output of the CMake run as well.

Is this a bug in that subsequent processing of the override file is not
using the cached value of PARAM?
Or, is there something wrong with the override file itself?

Thanks!

Mike





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