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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#.rst:
# CheckFortranFunctionExists
# --------------------------
#
# macro which checks if the Fortran function exists
#
# CHECK_FORTRAN_FUNCTION_EXISTS(FUNCTION VARIABLE)
#
# ::
#
# FUNCTION - the name of the Fortran function
# VARIABLE - variable to store the result
# Will be created as an internal cache variable.
#
#
#
# The following variables may be set before calling this macro to modify
# the way the check is run:
#
# ::
#
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
include_guard(GLOBAL)
macro(CHECK_FORTRAN_FUNCTION_EXISTS FUNCTION VARIABLE)
if(NOT DEFINED ${VARIABLE})
message(STATUS "Looking for Fortran ${FUNCTION}")
if(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
else()
set(CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
endif()
file(WRITE
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f
"
program TESTFortran
external ${FUNCTION}
call ${FUNCTION}()
end program TESTFortran
"
)
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler.f
${CHECK_FUNCTION_EXISTS_ADD_LIBRARIES}
OUTPUT_VARIABLE OUTPUT
)
# message(STATUS "${OUTPUT}")
if(${VARIABLE})
set(${VARIABLE} 1 CACHE INTERNAL "Have Fortran function ${FUNCTION}")
message(STATUS "Looking for Fortran ${FUNCTION} - found")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the Fortran ${FUNCTION} exists passed with the following output:\n"
"${OUTPUT}\n\n")
else()
message(STATUS "Looking for Fortran ${FUNCTION} - not found")
set(${VARIABLE} "" CACHE INTERNAL "Have Fortran function ${FUNCTION}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the Fortran ${FUNCTION} exists failed with the following output:\n"
"${OUTPUT}\n\n")
endif()
endif()
endmacro()
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