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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:
CMakeAddFortranSubdirectory
---------------------------
Add a fortran-only subdirectory, find a fortran compiler, and build.
The ``cmake_add_fortran_subdirectory`` function adds a subdirectory
to a project that contains a fortran-only subproject. 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 :variable:`BUILD_SHARED_LIBS` is turned on in
the project. In addition the :variable:`CMAKE_GNUtoMS` option is set
to on, so that Microsoft ``.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``.
#]=======================================================================]
set(_MS_MINGW_SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR})
include(CheckLanguage)
include(ExternalProject)
function(_setup_mingw_config_and_build source_dir build_dir)
# Look for a MinGW gfortran.
find_program(MINGW_GFORTRAN
NAMES gfortran
PATHS
c:/MinGW/bin
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\MinGW;InstallLocation]/bin"
)
if(NOT MINGW_GFORTRAN)
message(FATAL_ERROR
"gfortran not found, please install MinGW with the gfortran option."
"Or set the cache variable MINGW_GFORTRAN to the full path. "
" This is required to build")
endif()
# Validate the MinGW gfortran we found.
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
set(_mingw_target "Target:.*64.*mingw")
else()
set(_mingw_target "Target:.*mingw32")
endif()
execute_process(COMMAND "${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 rm -f
${CMAKE_CURRENT_BUILD_DIR}/${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()
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