CMake/Modules/Compiler/GNU-Fortran.cmake

include(Compiler/GNU)
__compiler_gnu(Fortran)

set(CMAKE_Fortran_FORMAT_FIXED_FLAG "-ffixed-form")
set(CMAKE_Fortran_FORMAT_FREE_FLAG "-ffree-form")

# No -DNDEBUG for Fortran.
set(CMAKE_Fortran_FLAGS_MINSIZEREL_INIT "-Os")
set(CMAKE_Fortran_FLAGS_RELEASE_INIT "-O3")

# No -isystem for Fortran because it will not find .mod files.
unset(CMAKE_INCLUDE_SYSTEM_FLAG_Fortran)

# Fortran-specific feature flags.
set(CMAKE_Fortran_MODDIR_FLAG -J)