#cmake file to set compiler flags for some of the known compilers
if (${CMAKE_Fortran_COMPILER_ID} MATCHES "Intel")
   message("Intel Fortran detected")
   if (${CMAKE_Fortran_COMPILER_VERSION} VERSION_LESS "13.0.0.0")
      set(FLEUR_WARN_MESSAGE "You are using an old version of the Intel Fortran Compiler. Most likely FLEUR will not be build sucessfully. Consider to upgrade your compiler.")
      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mkl -r8 -openmp -assume byterecl")
      set(FLEUR_MPI_DEFINITIONS ${FLEUR_MPI_DEFINITIONS} "CPP_OLDINTEL")
      set(FLEUR_DEFINITIONS ${FLEUR_DEFINITIONS} "CPP_OLDINTEL")   
   elseif (${CMAKE_Fortran_COMPILER_VERSION} VERSION_LESS "14.1.0.0")
      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mkl -r8 -openmp -assume byterecl")
   else()
      set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mkl -r8 -qopenmp -assume byterecl")
   endif()     
   set(CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -xHost -O2 -g")
   if (${CMAKE_Fortran_COMPILER_VERSION} VERSION_LESS "19.0.0.0")
       set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -C -traceback -O0 -g -ftrapuv -check uninit -check pointers -DCPP_DEBUG")
   else()
       set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -CB -traceback -O0 -g -ftrapuv -check uninit -check pointers -DCPP_DEBUG")
   endif()
elseif(${CMAKE_Fortran_COMPILER_ID} MATCHES "PGI")
   message("PGI Fortran detected")
   set(CMAKE_SHARED_LIBRARY_LINK_Fortran_FLAGS "") #fix problem in cmake
   #CPU   
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS}  -mp -Mr8 -Mr8intrinsics")
   #GPU
   #set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mp -Mr8 -Mr8intrinsics -Mcuda=cuda9.0,cc60 -Mcudalib=cublas")
   #set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mp -Mr8 -Mr8intrinsics  -Mcuda:kepler+ -ta:tesla:cuda7.5 -DUSE_STREAMS -DNUM_STREAMS=${N_STREAMS} -Minfo=accel -acc")
   #set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -mp -Mr8 -Mr8intrinsics  -Mcuda:cuda9.0,cc70 -DUSE_STREAMS -DNUM_STREAMS=${N_STREAMS} -Minfo=accel -acc")
   #set(CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -fast -O3")
   set(CMAKE_Fortran_FLAGS_RELEASE "-O1 ") # to prevent cmake from putting -fast which auses problems with PGI18.4
   set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -C -traceback -O0 -g -Mchkstk -Mchkptr -Ktrap=fp -DCPP_DEBUG")
elseif(${CMAKE_Fortran_COMPILER_ID} MATCHES "XL")
   message("IBM/BG Fortran detected")
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -qsmp=omp -qnosave -qarch=qp -qtune=qp -qrealsize=8 -qfixed -qsuppress=1520-022 -qessl") 
   set(CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -O4   -qsuppress=1500-036")
   set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG}  -O0 -g -DCPP_DEBUG")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -I/bgsys/local/libxml2/include/libxml2")
   set(FLEUR_DEFINITIONS ${FLEUR_DEFINITIONS} "CPP_AIX")
   set(FLEUR_MPI_DEFINITIONS ${FLEUR_MPI_DEFINITIONS} "CPP_AIX")
elseif(${CMAKE_Fortran_COMPILER_ID} MATCHES "GNU")
   message("gfortran detected")
   if (${CMAKE_Fortran_COMPILER_VERSION} VERSION_LESS "6.1.0")
      message(FATAL_ERROR "Only modern versions of gfortran >6.3 will be able to compile FLEUR\nYou need to specify a different compiler.\nSee the docs at www.flapw.de.\n")
   endif()
   set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -ffree-line-length-none -fopenmp -fdefault-real-8 ")
   set(CMAKE_Fortran_FLAGS_RELEASE "${CMAKE_Fortran_FLAGS_RELEASE} -O2")
   set(CMAKE_Fortran_FLAGS_DEBUG "${CMAKE_Fortran_FLAGS_DEBUG} -fdump-core -Wall -Wextra -Warray-temporaries  -fbacktrace -fcheck=all  -finit-real=nan -O0 -g -DCPP_DEBUG")
endif()