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Add CMakeAddFortranSubdirectory to use MinGW gfortran in VS
This patch adds a new module that allows for easy integration of MinGW gfortran and the Visual Studio compiler. It is done in a function called cmake_add_fortran_subdirectory. The patch also includes a test for this feature.
This commit is contained in:
Bill Hoffman
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# - Use MinGW gfortran from VS if a fortran compiler is not found.
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# The 'add_fortran_subdirectory' function adds a subdirectory
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# to a project that contains a fortran only sub-project. The module
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# will check the current compiler and see if it can support fortran.
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# If no fortran compiler is found and the compiler is MSVC, then
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# this module will find the MinGW gfortran. It will then use
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# an external project to build with the MinGW tools. It will also
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# create imported targets for the libraries created. This will only
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# work if the fortran code is built into a dll, so BUILD_SHARED_LIBS
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# is turned on in the project. In addition the GNUtoMS option is set
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# to on, so that the MS .lib files are created.
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# Usage is as follows:
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# cmake_add_fortran_subdirectory(
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# <subdir> # name of subdirectory
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# PROJECT <project_name> # project name in sbudir toplevel CMakeLists.txt
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# ARCHIVE_DIR <dir> # .lib location relative to root binary tree (lib)
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# RUNTIME_DIR <dir> # .dll location relative to root binary tree (bin)
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# LIBRARIES lib2 lib2 # names of libraries created and exported
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# LINK_LIBRARIES # link interface libraries for LIBRARIES
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# LINK_LIBS <lib1> <dep1> <dep2> ... <depN>
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# LINK_LIBS <lib2> <dep1> <dep2> ... <depN>
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# CMAKE_COMMAND_LINE # extra command line flags to pass to cmake
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# )
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#
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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set(_MS_MINGW_SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR})
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include(CheckLanguage)
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include(ExternalProject)
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include(CMakeParseArguments)
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function(_setup_mingw_config_and_build source_dir)
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find_program(MINGW_GFORTRAN NAMES gfortran
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HINTS
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c:/MinGW/bin
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"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\MinGW;InstallLocation]/bin" )
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if(NOT MINGW_GFORTRAN)
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message(FATAL_ERROR
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"gfortran not found, please install MinGW with the gfortran option."
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"Or set the cache variable MINGW_GFORTRAN to the full path. "
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" This is required to build")
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endif()
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execute_process(COMMAND ${MINGW_GFORTRAN} -v ERROR_VARIABLE out)
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if(NOT "${out}" MATCHES "Target:.*mingw32")
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message(FATAL_ERROR "Non-MinGW gfortran found: ${MINGW_GFORTRAN}\n"
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"output from -v [${out}]\n"
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"set MINGW_GFORTRAN to the path to MinGW fortran.")
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endif()
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get_filename_component(MINGW_PATH ${MINGW_GFORTRAN} PATH)
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file(TO_NATIVE_PATH "${MINGW_PATH}" MINGW_PATH)
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string(REPLACE "\\" "\\\\" MINGW_PATH "${MINGW_PATH}")
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configure_file(
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${_MS_MINGW_SOURCE_DIR}/CMakeAddFortranSubdirectory/config_mingw.cmake.in
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${CMAKE_CURRENT_BINARY_DIR}/config_mingw.cmake
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@ONLY)
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configure_file(
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${_MS_MINGW_SOURCE_DIR}/CMakeAddFortranSubdirectory/build_mingw.cmake.in
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${CMAKE_CURRENT_BINARY_DIR}/build_mingw.cmake
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@ONLY)
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endfunction()
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function(_add_fortran_library_link_interface library depend_library)
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set_target_properties(${library} PROPERTIES
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IMPORTED_LINK_INTERFACE_LIBRARIES_NOCONFIG "${depend_library}")
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endfunction()
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function(cmake_add_fortran_subdirectory subdir)
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# if we are not using MSVC without fortran support
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# then just use the usual add_subdirectory to build
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# the fortran library
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check_language(Fortran)
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if(NOT (MSVC AND (NOT CMAKE_Fortran_COMPILER)))
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add_subdirectory(${subdir})
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return()
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endif()
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# if we have MSVC without Intel fortran then setup
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# external projects to build with mingw fortran
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# Parse arguments to function
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set(oneValueArgs PROJECT ARCHIVE_DIR RUNTIME_DIR)
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set(multiValueArgs LIBRARIES LINK_LIBRARIES CMAKE_COMMAND_LINE)
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cmake_parse_arguments(ARGS "" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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set(source_dir "${CMAKE_CURRENT_SOURCE_DIR}/${subdir}")
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set(project_name "${ARGS_PROJECT}")
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set(library_dir "${ARGS_ARCHIVE_DIR}")
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set(binary_dir "${ARGS_RUNTIME_DIR}")
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set(libraries ${ARGS_LIBRARIES})
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# use the same directory that add_subdirectory would have used
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set(build_dir "${CMAKE_CURRENT_BINARY_DIR}/${subdir}")
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# create build and configure wrapper scripts
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_setup_mingw_config_and_build(${source_dir})
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# create the external project
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externalproject_add(${project_name}_build
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SOURCE_DIR ${source_dir}
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BINARY_DIR ${build_dir}
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CONFIGURE_COMMAND ${CMAKE_COMMAND}
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-P ${CMAKE_CURRENT_BINARY_DIR}/config_mingw.cmake
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BUILD_COMMAND ${CMAKE_COMMAND}
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-P ${CMAKE_CURRENT_BINARY_DIR}/build_mingw.cmake
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INSTALL_COMMAND ""
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)
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# make the external project always run make with each build
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externalproject_add_step(${project_name}_build forcebuild
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COMMAND ${CMAKE_COMMAND}
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-E remove
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${CMAKE_CURRENT_BUILD_DIR}/${project_name}-prefix/src/${project_name}-stamp/${project_name}-build
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DEPENDEES configure
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DEPENDERS build
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ALWAYS 1
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)
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# create imported targets for all libraries
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foreach(lib ${libraries})
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add_library(${lib} SHARED IMPORTED)
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set_property(TARGET ${lib} APPEND PROPERTY IMPORTED_CONFIGURATIONS NOCONFIG)
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set_target_properties(${lib} PROPERTIES
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IMPORTED_IMPLIB_NOCONFIG
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"${build_dir}/${library_dir}/lib${lib}.lib"
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IMPORTED_LOCATION_NOCONFIG
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"${build_dir}/${binary_dir}/lib${lib}.dll"
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)
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add_dependencies(${lib} ${project_name}_build)
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endforeach()
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# now setup link libraries for targets
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set(start FALSE)
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set(target)
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foreach(lib ${ARGS_LINK_LIBRARIES})
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if("${lib}" STREQUAL "LINK_LIBS")
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set(start TRUE)
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else()
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if(start)
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if(DEFINED target)
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# process current target and target_libs
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_add_fortran_library_link_interface(${target} "${target_libs}")
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# zero out target and target_libs
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set(target)
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set(target_libs)
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endif()
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# save the current target and set start to FALSE
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set(target ${lib})
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set(start FALSE)
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else()
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# append the lib to target_libs
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list(APPEND target_libs "${lib}")
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endif()
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endif()
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endforeach()
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# process anything that is left in target and target_libs
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if(DEFINED target)
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_add_fortran_library_link_interface(${target} "${target_libs}")
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endif()
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endfunction()
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