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function(check_and_update target_file new_file)
execute_process(
COMMAND ${CMAKE_COMMAND} -E compare_files ${target_file} ${new_file}
RESULT_VARIABLE compare_result
)
if(${compare_result} EQUAL 0)
message(STATUS "${target_file} is up-to-date")
else()
message(WARNING "${target_file} was generated! "
"If you ship the generated bindings with your sources, don't forget to ship this updated file (and its variants). "
"Otherwise, this warning can be ignored.")
get_filename_component(target_path ${target_file} PATH)
file(COPY ${new_file} DESTINATION ${target_path})
endif()
file(REMOVE ${new_file})
endfunction()
# Generate bindings and compare against existing ones
message(STATUS "Generating bindings for library ${FORTRAN_MODULE_NAME}")
set(generator_dir ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/generated_bindings)
file(MAKE_DIRECTORY ${generator_dir})
get_filename_component(filename_BINDINGS_C_DECL_FILENAME ${BINDINGS_C_DECL_FILENAME} NAME)
set(new_BINDINGS_C_DECL_FILENAME ${generator_dir}/${filename_BINDINGS_C_DECL_FILENAME})
get_filename_component(filename_BINDINGS_FORTRAN_DECL_FILENAME ${BINDINGS_FORTRAN_DECL_FILENAME} NAME)
set(new_BINDINGS_FORTRAN_DECL_FILENAME ${generator_dir}/${filename_BINDINGS_FORTRAN_DECL_FILENAME})
# run generator
execute_process(COMMAND ${GENERATOR} ${new_BINDINGS_C_DECL_FILENAME} ${new_BINDINGS_FORTRAN_DECL_FILENAME} ${FORTRAN_MODULE_NAME}
RESULT_VARIABLE generate_result
OUTPUT_VARIABLE generate_out
ERROR_VARIABLE generate_out
)
if(${generate_result} STREQUAL "0")
# only update the bindings if they changed (file not touched -> no rebuild is triggered)
check_and_update(${BINDINGS_C_DECL_FILENAME} ${new_BINDINGS_C_DECL_FILENAME})
check_and_update(${BINDINGS_FORTRAN_DECL_FILENAME} ${new_BINDINGS_FORTRAN_DECL_FILENAME})
else()
message(FATAL_ERROR "GENERATING BINDINGS FAILED. Possibly you cross-compiled the bindings generator for a target "
" which cannot be executed on this host. Consider using the cross-compilation option.\n Exit code: ${generate_result}\n${generate_out}")
endif()
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