Re: [CMake] modify cmake build arguments

Eric Doenges Thu, 29 Aug 2019 22:49:05 -0700

On 29.08.2019 22:38, fdk17 wrote:

On Thu, Aug 29, 2019, at 2:52 PM, Kyle Edwards via CMake wrote:

On Thu, 2019-08-29 at 18:27 +0100, hex wrote:

> hello community,

>

> CMake builds a C project with gcc -o target_name. I have a compiler

> very similar to GCC and I am trying configure CMake C language for

> it.

>

> The compiler does not support the -o argument when linking objects. I

> wonder if there is a way to remove or modify this argument, maybe

> through one of the properties on targets?

>

> thank you

Your best bet would be to modify the CMake source code to support your

compiler. (Upstreaming your changes would be welcome.)

As a matter of interest, what does it use instead of -o?

Kyle

If you are using the Makefile generator then try:

https://cmake.org/cmake/help/latest/variable/CMAKE_USER_MAKE_RULES_OVERRIDE.html

You may then be able to provide the rules needed, refer to "Modules/CMakeCInformation.cmake".

The way I understand it is that the rule templates are used by the Makefile generator.

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

Geschäftsführer: Dr. Wolfgang Eckstein, Dr. Olaf Munkelt
Amtsgericht München HRB 114695

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