[CMake] Possible to modify COMPILE_FLAGS?

[Michael Wild]

On 10/25/2011 09:51 AM, Campbell Barton wrote:
> The problem I'm trying to solve is to have "-Werror" for the whole
> project except a few files which include system headers that give
> warnings we can't workaround (even with -isystem).
> 
> So I'm trying to get cmake to replace some flags for a specific file,
> and I ran into the problem that the variable appears not to be set.
> 
> get_source_file_property(MYVAR intern/BME_Customdata.c COMPILE_FLAGS)
> ... modify the MYVAR
> ... set the flags back
> 
> But the variable isnt set, Im sure the source file is valid because I
> printed it from the list passed to the target, and I tried this before
> and after defining the source file in the target:
> message(FATAL_ERROR "Check: ${MYVAR}")
> Check: NOTFOUND
> 
> 
> I'm guessing the COMPILE_FLAGS property can be set which overrides the
> default flags but is there a good way to manipulate the existing
> flags?
> 

Problem is, that the COMPILE_FLAGS property only *appends* to the
default compile flags. You'll have to remove -Werror from
CMAKE_<LANG>_FLAGS[_<CONFIG>] variables and set it instead on all the
files you want it to be set for.

Michael