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# (c) https://github.com/dev-cafe/autocmake/blob/master/AUTHORS.md
# licensed under BSD-3: https://github.com/dev-cafe/autocmake/blob/master/LICENSE
#.rst:
#
# Adds optional Fortran support.
# Appends EXTRA_FCFLAGS to CMAKE_Fortran_FLAGS.
# If environment variable FCFLAGS is set, then the FCFLAGS are used
# and no other flags are used or appended.
#
# Variables used::
#
# EXTRA_FCFLAGS
# ENABLE_FC_SUPPORT
#
# Variables defined::
#
# CMAKE_Fortran_MODULE_DIRECTORY
#
# Variables modified::
#
# CMAKE_Fortran_FLAGS
#
# Variables defined::
#
# ENABLE_FC_SUPPORT
#
# Environment variables used::
#
# FCFLAGS
#
# autocmake.yml configuration::
#
# docopt:
# - "--fc=<FC> Fortran compiler [default: gfortran]."
# - "--extra-fc-flags=<EXTRA_FCFLAGS> Extra Fortran compiler flags [default: '']."
# - "--fc-support=<FC_SUPPORT> Toggle Fortran language support (ON/OFF) [default: ON]."
# define:
# - "'-DCMAKE_Fortran_COMPILER={0} -DEXTRA_FCFLAGS=\"{1}\"'.format(arguments['--fc'], arguments['--extra-fc-flags'])"
# - "'-DENABLE_FC_SUPPORT={0}'.format(arguments['--fc-support'])"
option(ENABLE_FC_SUPPORT "Enable Fortran language support" ON)
if(ENABLE_FC_SUPPORT)
enable_language(Fortran)
set(CMAKE_Fortran_MODULE_DIRECTORY ${PROJECT_BINARY_DIR}/modules)
include_directories(${PROJECT_BINARY_DIR}/modules)
if(NOT DEFINED CMAKE_Fortran_COMPILER_ID)
message(FATAL_ERROR "CMAKE_Fortran_COMPILER_ID variable is not defined!")
endif()
if(NOT CMAKE_Fortran_COMPILER_WORKS)
message(FATAL_ERROR "CMAKE_Fortran_COMPILER_WORKS is false!")
endif()
if(DEFINED EXTRA_FCFLAGS)
if(NOT EXTRA_FCFLAGS STREQUAL "")
set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${EXTRA_FCFLAGS}")
endif()
endif()
if(DEFINED ENV{FCFLAGS})
message(STATUS "FCFLAGS is set to '$ENV{FCFLAGS}'.")
set(CMAKE_Fortran_FLAGS "$ENV{FCFLAGS}")
endif()
else()
# workaround to avoid unused warning
if(DEFINED EXTRA_FCFLAGS)
set(_unused ${EXTRA_FCFLAGS})
unset(_unused)
endif()
endif()
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