[CMake] modify cmake build arguments

[hex]

thank you this is exactly what I am looking for. It is working well.

 From the documentation:

«It is loaded after CMake’s builtin compiler and platform information 
modules have been loaded but before the information is used.»

since CMakeCInformation.cmake:

# compile a C file into an object file
if(NOT CMAKE_C_COMPILE_OBJECT)
   set(CMAKE_C_COMPILE_OBJECT
     "<CMAKE_C_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -o <OBJECT>   -c 
<SOURCE>")
endif()


CMAKE_USER_MAKE_RULES_OVERRIDE_C must be set before the language is set, 
i.e. before any `enable_language()` or `project()` instruction.


On 30/08/2019 06:47, Eric Doenges wrote:
>
> The way I understand the documentation, CMAKE_USER_MAKE_RULES_OVERRIDE 
> applies for all generators, not just the Makefile one. What you are 
> apparently supposed to do is create a file that sets all the "rule 
> variables" as required (in this case, CMAKE_C_COMPILE_OBJECT), and 
> then include that file via CMAKE_USER_MAKE_RULES_OVERRIDE. I'm not 
> sure if these 'rule variables' are documented anywhere - but you can 
> look into "<path where CMake is 
> installed>/share/cmake-<version>/Modules/Compiler" for inspiration. 
> Another good starting point would be 
> "<...>/share/cmake-<version>/Modules/CMakeCInformation.cmake".
>
> With kind regards,
> Eric
>
> *Dr. Eric Dönges *
> Senior Software Engineer
>
> MVTec Software GmbH | Arnulfstr. 205 | 80634 Munich | Germany
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