[CMake] complete change of compilation flags for a single file

[Ilias Miroslav]

Dear experts,

within our cmake project there are needs to change compilation flags of some individual files, especially we want sometimes to decrease optimization level.

For that there is a command "set_source_file_properties", but among PROPERTIES,

http://grip.espace-win.net/doc/apps/cmake/cmake-properties.txt , 

there is no flag to completely replace/modify  CMAKE_Fortran_FLAGS + CMAKE_Fortran_FLAGS_RELEASE for that file.

There is only "COMPILE_FLAGS" putting extra compiler flags for file 's compilation.

For instance, for chosen file "some_file.F90"
SET_SOURCE_FILES_PROPERTIES( some_file.F90 PROPERTIES COMPILE_FLAGS "-O1l")

this command combines -O3 from CMAKE_Fortran_FLAGS_RELEASE with -O1 from COMPILE_FLAGS ... but we want only -O1.

Another example:

  set_source_files_properties( abacus/her2drv.F    PROPERTIES COMPILE_FLAGS "-O0 -no-ip"  )

make VERBOSE=1 abacus/her2drv.o

make -f CMakeFiles/dirac.dir/build.make CMakeFiles/dirac.dir/abacus/her2drv.F.o
make[1]: Entering directory `/people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/build_ompi_ifort_icc_mkl_ilp64'
/people/disk2/ilias/bin/cmake_install/bin/cmake -E cmake_progress_report /people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/build_ompi_ifort_icc_mkl_ilp64/CMakeFiles 
Building Fortran object CMakeFiles/dirac.dir/abacus/her2drv.F.o
/people/disk2/ilias/bin/openmpi_ifort_icc_ilp64/bin/mpif90  -o CMakeFiles/dirac.dir/abacus/her2drv.F.o -DPRG_DIRAC -DTHIS_IS_CMAKE_BUILD -DMOD_XML -DMOD_OPENRSP -DMOD_OOF -DMOD_ESR -DMOD_KRCC -DMOD_SRDFT -DMOD_XCFUN -DMOD_MAGNETIZ -DMOD_MCSCF_spinfree -DMOD_UNRELEASED -DMOD_CAP -DMOD_ERI -DMOD_DNF -DINSTALL_WRKMEM=64000000 -DSYS_LINUX -DINT_STAR8 -DVAR_MPI -DVAR_MPI2 -w -assume byterecl -DVAR_IFORT -g -traceback -i8  -O3 -ip -module modules -I/people/disk2/ilias/bin/openmpi_ifort_icc_ilp64_valgrind/include -I/people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/include -I/people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/build_ompi_ifort_icc_mkl_ilp64/modules -I/people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/build_ompi_ifort_icc_mkl_ilp64/xcint/xcfun/fortran   -O0 -no-ip -c /people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/abacus/her2drv.F
make[1]: Leaving directory `/people/disk2/ilias/QCH_Work/qch_progs/dirac_git/trunk/build_ompi_ifort_icc_mkl_ilp64'

Here it combines  -O3 -ip "at the beginning" (in CMAKE_Fortran_FLAGS_RELEASE ) with -O0 -no-ip "at the end", but we don't want this.

Any help please ?

Miro