[cmake-developers] Knowing if a C project is being built

[Rolf Eike Beer]

Brad King wrote:
> On 2/21/2012 5:47 PM, Stephen Kelly wrote:
> >> add_library(mylib mylib.c)
> >> generate_export_header(mylib)
> > 
> > I'm looking into fixing this bug, and I was wondering how to. I have never
> > built C code with CMake.
> > 
> > I will need to conditionally call different check_compiles macros. Can I
> > so
> > something like
> > 
> > if(CMAKE_C_PROJECT)
> > check_cxx_compiler_flag(-fvisibility=hidden
> > COMPILER_HAS_HIDDEN_VISIBILITY)
> > else()
> > check_c_compiler_flag(-fvisibility=hidden COMPILER_HAS_HIDDEN_VISIBILITY)
> > endif()
> 
> Use CMAKE_<LANG>_COMPILER_LOADED to determine which
> languages are enabled.  Then check both C and CXX
> compilers.  If the results are the same then you
> can just write the header normally.  Otherwise write
> the header with #ifdef __cplusplus to distinguish
> the two compilers.

In the last modification in FindOpenMP I used  the ENABLED_LANGUAGES property. 
Which of both ways is the preferred one?

Eike
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