[CMake] CHECK_C_SOURCE_COMPILES and include_directories

[Rolf Eike Beer]

Florian Weimer wrote:
> * Rolf Eike Beer:
> > Florian Weimer wrote:
> >> Is there a way to make CHECK_C_SOURCE_COMPILES honor the discovered
> >> include directories?
> >> 
> >  cmake --help-module CheckCSourceCompiles
> > 
> > The following variables may be set before calling this macro to modify
> > the way the check is run:
> > […]
> > 
> >  CMAKE_REQUIRED_INCLUDES = list of include directories
> 
> I saw that, but I thought this happens behind the scenes.  Do I have
> to set this variable in addition to the include_directories directive?

Yes, include_directories() only affects target, i.e. add_executable and 
friends, but not macros like CHECK_C_SOURCE_COMPILES. Those will explicitely 
look at those variables.

Eike
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