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+# - Use MinGW gfortran from VS if a fortran compiler is not found.
+# The 'add_fortran_subdirectory' function adds a subdirectory
+# to a project that contains a fortran only sub-project. The module
+# will check the current compiler and see if it can support fortran.
+# If no fortran compiler is found and the compiler is MSVC, then
+# this module will find the MinGW gfortran. It will then use
+# an external project to build with the MinGW tools. It will also
+# create imported targets for the libraries created. This will only
+# work if the fortran code is built into a dll, so BUILD_SHARED_LIBS
+# is turned on in the project. In addition the CMAKE_GNUtoMS option
+# is set to on, so that the MS .lib files are created.
+# Usage is as follows:
+# cmake_add_fortran_subdirectory(
+# <subdir> # name of subdirectory
+# PROJECT <project_name> # project name in subdir top CMakeLists.txt
+# ARCHIVE_DIR <dir> # dir where project places .lib files
+# RUNTIME_DIR <dir> # dir where project places .dll files
+# LIBRARIES <lib>... # names of library targets to import
+# LINK_LIBRARIES # link interface libraries for LIBRARIES
+# [LINK_LIBS <lib> <dep>...]...
+# CMAKE_COMMAND_LINE ... # extra command line flags to pass to cmake
+# NO_EXTERNAL_INSTALL # skip installation of external project
+# )
+# Relative paths in ARCHIVE_DIR and RUNTIME_DIR are interpreted with respect
+# to the build directory corresponding to the source directory in which the
+# function is invoked.
+#
+# Limitations:
+#
+# NO_EXTERNAL_INSTALL is required for forward compatibility with a
+# future version that supports installation of the external project
+# binaries during "make install".
+
+#=============================================================================
+# Copyright 2011-2012 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+# License text for the above reference.)
+
+
+set(_MS_MINGW_SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR})
+include(CheckLanguage)
+include(ExternalProject)
+include(CMakeParseArguments)
+
+function(_setup_mingw_config_and_build source_dir build_dir)
+ # Look for a MinGW gfortran.
+ find_program(MINGW_GFORTRAN
+ NAMES gfortran
+ PATHS
+ c:/MinGW/bin
+ "[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\MinGW;InstallLocation]/bin"
+ )
+ if(NOT MINGW_GFORTRAN)
+ message(FATAL_ERROR
+ "gfortran not found, please install MinGW with the gfortran option."
+ "Or set the cache variable MINGW_GFORTRAN to the full path. "
+ " This is required to build")
+ endif()
+
+ # Validate the MinGW gfortran we found.
+ if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+ set(_mingw_target "Target:.*64.*mingw")
+ else()
+ set(_mingw_target "Target:.*mingw32")
+ endif()
+ execute_process(COMMAND "${MINGW_GFORTRAN}" -v
+ ERROR_VARIABLE out ERROR_STRIP_TRAILING_WHITESPACE)
+ if(NOT "${out}" MATCHES "${_mingw_target}")
+ string(REPLACE "\n" "\n " out " ${out}")
+ message(FATAL_ERROR
+ "MINGW_GFORTRAN is set to\n"
+ " ${MINGW_GFORTRAN}\n"
+ "which is not a MinGW gfortran for this architecture. "
+ "The output from -v does not match \"${_mingw_target}\":\n"
+ "${out}\n"
+ "Set MINGW_GFORTRAN to a proper MinGW gfortran for this architecture."
+ )
+ endif()
+
+ # Configure scripts to run MinGW tools with the proper PATH.
+ get_filename_component(MINGW_PATH ${MINGW_GFORTRAN} PATH)
+ file(TO_NATIVE_PATH "${MINGW_PATH}" MINGW_PATH)
+ string(REPLACE "\\" "\\\\" MINGW_PATH "${MINGW_PATH}")
+ configure_file(
+ ${_MS_MINGW_SOURCE_DIR}/CMakeAddFortranSubdirectory/config_mingw.cmake.in
+ ${build_dir}/config_mingw.cmake
+ @ONLY)
+ configure_file(
+ ${_MS_MINGW_SOURCE_DIR}/CMakeAddFortranSubdirectory/build_mingw.cmake.in
+ ${build_dir}/build_mingw.cmake
+ @ONLY)
+endfunction()
+
+function(_add_fortran_library_link_interface library depend_library)
+ set_target_properties(${library} PROPERTIES
+ IMPORTED_LINK_INTERFACE_LIBRARIES_NOCONFIG "${depend_library}")
+endfunction()
+
+
+function(cmake_add_fortran_subdirectory subdir)
+ # Parse arguments to function
+ set(options NO_EXTERNAL_INSTALL)
+ set(oneValueArgs PROJECT ARCHIVE_DIR RUNTIME_DIR)
+ set(multiValueArgs LIBRARIES LINK_LIBRARIES CMAKE_COMMAND_LINE)
+ cmake_parse_arguments(ARGS "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+ if(NOT ARGS_NO_EXTERNAL_INSTALL)
+ message(FATAL_ERROR
+ "Option NO_EXTERNAL_INSTALL is required (for forward compatibility) "
+ "but was not given."
+ )
+ endif()
+
+ # if we are not using MSVC without fortran support
+ # then just use the usual add_subdirectory to build
+ # the fortran library
+ check_language(Fortran)
+ if(NOT (MSVC AND (NOT CMAKE_Fortran_COMPILER)))
+ add_subdirectory(${subdir})
+ return()
+ endif()
+
+ # if we have MSVC without Intel fortran then setup
+ # external projects to build with mingw fortran
+
+ set(source_dir "${CMAKE_CURRENT_SOURCE_DIR}/${subdir}")
+ set(project_name "${ARGS_PROJECT}")
+ set(library_dir "${ARGS_ARCHIVE_DIR}")
+ set(binary_dir "${ARGS_RUNTIME_DIR}")
+ set(libraries ${ARGS_LIBRARIES})
+ # use the same directory that add_subdirectory would have used
+ set(build_dir "${CMAKE_CURRENT_BINARY_DIR}/${subdir}")
+ foreach(dir_var library_dir binary_dir)
+ if(NOT IS_ABSOLUTE "${${dir_var}}")
+ get_filename_component(${dir_var}
+ "${CMAKE_CURRENT_BINARY_DIR}/${${dir_var}}" ABSOLUTE)
+ endif()
+ endforeach()
+ # create build and configure wrapper scripts
+ _setup_mingw_config_and_build("${source_dir}" "${build_dir}")
+ # create the external project
+ externalproject_add(${project_name}_build
+ SOURCE_DIR ${source_dir}
+ BINARY_DIR ${build_dir}
+ CONFIGURE_COMMAND ${CMAKE_COMMAND}
+ -P ${build_dir}/config_mingw.cmake
+ BUILD_COMMAND ${CMAKE_COMMAND}
+ -P ${build_dir}/build_mingw.cmake
+ INSTALL_COMMAND ""
+ )
+ # make the external project always run make with each build
+ externalproject_add_step(${project_name}_build forcebuild
+ COMMAND ${CMAKE_COMMAND}
+ -E remove
+ ${CMAKE_CURRENT_BUILD_DIR}/${project_name}-prefix/src/${project_name}-stamp/${project_name}-build
+ DEPENDEES configure
+ DEPENDERS build
+ ALWAYS 1
+ )
+ # create imported targets for all libraries
+ foreach(lib ${libraries})
+ add_library(${lib} SHARED IMPORTED GLOBAL)
+ set_property(TARGET ${lib} APPEND PROPERTY IMPORTED_CONFIGURATIONS NOCONFIG)
+ set_target_properties(${lib} PROPERTIES
+ IMPORTED_IMPLIB_NOCONFIG "${library_dir}/lib${lib}.lib"
+ IMPORTED_LOCATION_NOCONFIG "${binary_dir}/lib${lib}.dll"
+ )
+ add_dependencies(${lib} ${project_name}_build)
+ endforeach()
+
+ # now setup link libraries for targets
+ set(start FALSE)
+ set(target)
+ foreach(lib ${ARGS_LINK_LIBRARIES})
+ if("${lib}" STREQUAL "LINK_LIBS")
+ set(start TRUE)
+ else()
+ if(start)
+ if(DEFINED target)
+ # process current target and target_libs
+ _add_fortran_library_link_interface(${target} "${target_libs}")
+ # zero out target and target_libs
+ set(target)
+ set(target_libs)
+ endif()
+ # save the current target and set start to FALSE
+ set(target ${lib})
+ set(start FALSE)
+ else()
+ # append the lib to target_libs
+ list(APPEND target_libs "${lib}")
+ endif()
+ endif()
+ endforeach()
+ # process anything that is left in target and target_libs
+ if(DEFINED target)
+ _add_fortran_library_link_interface(${target} "${target_libs}")
+ endif()
+endfunction()