Add build flag to enable PGO for Engine build. about openradioss

[Nobutarou]

I can build.

For the 1st step, I missed -lgcov. Thus, I add it to addflag,

-addflag="-O2 -fprofile-generate -lgcov''

and I need to pass '-lgcov' to the linker. I have to modify <openradioss_root>/engine/cbuild_linux64_gf_ompi/CMakeFiles/engine_linux64_gf_ompi.dir/link.txt to

gfortran   -fopenmp  -ldl -lrt -lstdc++    @CMakeFiles/engine_linux64_gf_ompi.dir/objects1.rsp @CMakeFiles/engine_linux64_gf_ompi.dir/objects2.rsp -o engine_linux64_gf_ompi  -lrt -L/opt/openmpi/lib -lmpi -lmpi_mpifh -ldl -Wunused-function -lstdc++ -lgcov

I don't know what file generates link.txt. Thus, I just modify and disallow removal.

[laurent-altr]

Hi @Nobutarou,

For the engine, you can add the compilation flags into the file cmake_linux64_gf.txt.

Thank you!

[Nobutarou]

I find CMAKE_EXE_LINKER_FLAGS in the file. Helpful.
Thank you.