[CMake] Set C compiler flags but not linker flags

[Roland Schulz]

Hi,

if I set compiler flags using CMAKE_C_FLAGS these flags are also added
to the linker flags for C executables and libraries. How can I set
compiler flags without those same flags also appended to the linker
flags?

In this specific case I would like to add "-fopenmp" to the compiler
but do not want this flag to be added to the linker because I want the
openmp library to be linked statically.  For GCC this can be done with
"-Wl,-static -lgomp -lrt -Wl,-Bdynamic -lpthread" but only works if
"-fopenmp" is not also given as a linker flag. Thus it is important
that "-fopenmp" which is needed as compile time option is not appended
to the linker flags.

This is with GCC on Linux with "Unix Makesfiles" and cmake 2.8.8.

Roland
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