Yes, it should be configurable via one option flag.
The cmake user can control it but it is not well documented and different to
configure depending on compiler and generator used:
#for ninja generator:
set(CMAKE_DEPFILE_FLAGS_CXX "-MMD -MT <OBJECT> -MF <DEPFILE>" CACHE STRING
"dependency flag" FORCE)
# for makefile generator:
option(CMAKE_DEPENDS_IN_PROJECT_ONLY „do NOT use system header dependencies“ ON)
###############
But I am still wondering why different default behaviors in Nina and Makefile
generators?
Claus
> Am 06.02.2018 um 13:22 schrieb Brad King <brad.k...@kitware.com>:
>
> Some people want system headers checked for $reasons, and others
> don't want them checked for $other_reasons. The only way to satisfy
> both groups is to make it an option.
>
> The internal `CMAKE_DEPFILE_FLAGS_${lang}` table of flags used for this
> would need to be extended with `CMAKE_DEPFILE_NOSYSTEM_FLAGS_${lang}`
> alternatives. Some option would need to be introduced to choose.
>
> -Brad
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