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285 lines
9.8 KiB
285 lines
9.8 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
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# file Copyright.txt or https://cmake.org/licensing for details. |
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# Original file from CMake Community Modules by vector-of-bool |
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# (https://github.com/vector-of-bool/CMakeCM) |
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# |
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# With modifications by the Xournal++ Team |
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#[=======================================================================[.rst: |
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FindFilesystem |
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############## |
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This module supports the C++17 standard library's filesystem utilities. Use the |
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:imp-target:`std::filesystem` imported target to |
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Options |
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******* |
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The ``COMPONENTS`` argument to this module supports the following values: |
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.. find-component:: Experimental |
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:name: fs.Experimental |
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Allows the module to find the "experimental" Filesystem TS version of the |
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Filesystem library. This is the library that should be used with the |
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``std::experimental::filesystem`` namespace. |
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.. find-component:: Final |
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:name: fs.Final |
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Finds the final C++17 standard version of the filesystem library. |
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If no components are provided, behaves as if the |
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:find-component:`fs.Final` component was specified. |
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If both :find-component:`fs.Experimental` and :find-component:`fs.Final` are |
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provided, first looks for ``Final``, and falls back to ``Experimental`` in case |
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of failure. If ``Final`` is found, :imp-target:`std::filesystem` and all |
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:ref:`variables <fs.variables>` will refer to the ``Final`` version. |
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Imported Targets |
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**************** |
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.. imp-target:: std::filesystem |
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The ``std::filesystem`` imported target is defined when any requested |
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version of the C++ filesystem library has been found, whether it is |
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*Experimental* or *Final*. |
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If no version of the filesystem library is available, this target will not |
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be defined. |
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.. note:: |
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This target has ``cxx_std_17`` as an ``INTERFACE`` |
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:ref:`compile language standard feature <req-lang-standards>`. Linking |
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to this target will automatically enable C++17 if no later standard |
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version is already required on the linking target. |
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.. _fs.variables: |
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Variables |
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********* |
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.. variable:: CXX_FILESYSTEM_IS_EXPERIMENTAL |
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Set to ``TRUE`` when the :find-component:`fs.Experimental` version of C++ |
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filesystem library was found, otherwise ``FALSE``. |
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.. variable:: CXX_FILESYSTEM_HAVE_FS |
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Set to ``TRUE`` when a filesystem header was found. |
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.. variable:: CXX_FILESYSTEM_HEADER |
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Set to either ``filesystem`` or ``experimental/filesystem`` depending on |
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whether :find-component:`fs.Final` or :find-component:`fs.Experimental` was |
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found. |
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.. variable:: CXX_FILESYSTEM_NAMESPACE |
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Set to either ``std::filesystem`` or ``std::experimental::filesystem`` |
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depending on whether :find-component:`fs.Final` or |
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:find-component:`fs.Experimental` was found. |
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Examples |
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******** |
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Using `find_package(Filesystem)` with no component arguments: |
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.. code-block:: cmake |
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find_package(Filesystem REQUIRED) |
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add_executable(my-program main.cpp) |
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target_link_libraries(my-program PRIVATE std::filesystem) |
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#]=======================================================================] |
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if (TARGET std::filesystem) |
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# This module has already been processed. Don't do it again. |
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return() |
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endif () |
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include(CMakePushCheckState) |
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include(CheckIncludeFileCXX) |
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include(CheckCXXSourceCompiles) |
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include(ExternalProject) |
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cmake_push_check_state() |
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set(CMAKE_REQUIRED_QUIET ${Filesystem_FIND_QUIETLY}) |
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# All of our tests required C++17 or later |
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set(CMAKE_CXX_STANDARD 17) |
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# Normalize and check the component list we were given |
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set(want_components ${Filesystem_FIND_COMPONENTS}) |
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if (Filesystem_FIND_COMPONENTS STREQUAL "") |
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set(want_components Final) |
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endif () |
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# Warn on any unrecognized components |
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set(extra_components ${want_components}) |
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list(REMOVE_ITEM extra_components Final Experimental Boost ghc) |
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foreach (component IN LISTS extra_components) |
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message(WARNING "Extraneous find_package component for Filesystem: ${component}") |
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endforeach () |
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# Detect which of Experimental and Final we should look for |
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set(find_experimental TRUE) |
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set(find_final TRUE) |
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if (NOT "Final" IN_LIST want_components) |
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set(find_final FALSE) |
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endif () |
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if (NOT "Experimental" IN_LIST want_components) |
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set(find_experimental FALSE) |
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endif () |
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if (find_final) |
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check_include_file_cxx("filesystem" _CXX_FILESYSTEM_HAVE_HEADER) |
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mark_as_advanced(_CXX_FILESYSTEM_HAVE_HEADER) |
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if (_CXX_FILESYSTEM_HAVE_HEADER) |
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# We found the non-experimental header. Don't bother looking for the |
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# experimental one. |
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set(find_experimental FALSE) |
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endif () |
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else () |
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set(_CXX_FILESYSTEM_HAVE_HEADER FALSE) |
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endif () |
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if (find_experimental) |
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check_include_file_cxx("experimental/filesystem" _CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) |
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mark_as_advanced(_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) |
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else () |
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set(_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER FALSE) |
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endif () |
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if (_CXX_FILESYSTEM_HAVE_HEADER) |
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set(_have_fs TRUE) |
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set(_fs_header filesystem) |
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set(_fs_namespace std::filesystem) |
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elseif (_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) |
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set(_have_fs TRUE) |
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set(_fs_header experimental/filesystem) |
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set(_fs_namespace std::experimental::filesystem) |
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else () |
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set(_have_fs FALSE) |
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endif () |
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set(CXX_FILESYSTEM_HAVE_FS ${_have_fs} CACHE BOOL "TRUE if we have the C++ filesystem headers") |
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set(CXX_FILESYSTEM_HEADER ${_fs_header} CACHE STRING "The header that should be included to obtain the filesystem APIs") |
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set(CXX_FILESYSTEM_NAMESPACE ${_fs_namespace} CACHE STRING "The C++ namespace that contains the filesystem APIs") |
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set(_found FALSE) |
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if (CXX_FILESYSTEM_HAVE_FS) |
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# We have some filesystem library available. Do link checks |
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string(CONFIGURE [[ |
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#include <@CXX_FILESYSTEM_HEADER@> |
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#include <string> |
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int main() { |
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auto cwd = @CXX_FILESYSTEM_NAMESPACE@::current_path(); |
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return cwd.string().size(); |
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} |
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]] code @ONLY) |
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# Try to compile a simple filesystem program without any linker flags |
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check_cxx_source_compiles("${code}" CXX_FILESYSTEM_NO_LINK_NEEDED) |
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set(can_link ${CXX_FILESYSTEM_NO_LINK_NEEDED}) |
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if (NOT CXX_FILESYSTEM_NO_LINK_NEEDED) |
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set(prev_libraries ${CMAKE_REQUIRED_LIBRARIES}) |
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# Add the libstdc++ flag |
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set(CMAKE_REQUIRED_LIBRARIES ${prev_libraries} -lstdc++fs) |
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check_cxx_source_compiles("${code}" CXX_FILESYSTEM_STDCPPFS_NEEDED) |
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set(can_link ${CXX_FILESYSTEM_STDCPPFS_NEEDED}) |
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if (NOT CXX_FILESYSTEM_STDCPPFS_NEEDED) |
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# Try the libc++ flag |
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set(CMAKE_REQUIRED_LIBRARIES ${prev_libraries} -lc++fs) |
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check_cxx_source_compiles("${code}" CXX_FILESYSTEM_CPPFS_NEEDED) |
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set(can_link ${CXX_FILESYSTEM_CPPFS_NEEDED}) |
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if (NOT CXX_FILESYSTEM_CPPFS_NEEDED) |
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# Try the libc++ flag |
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set(CMAKE_REQUIRED_LIBRARIES ${prev_libraries} -lc++experimental) |
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check_cxx_source_compiles("${code}" CXX_FILESYSTEM_CPPEXP_NEEDED) |
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set(can_link ${CXX_FILESYSTEM_CPPEXP_NEEDED}) |
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endif () |
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endif () |
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endif () |
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if (can_link) |
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add_library(std_filesystem INTERFACE) |
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target_compile_features(std_filesystem INTERFACE cxx_std_17) |
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set(_found TRUE) |
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if (CXX_FILESYSTEM_NO_LINK_NEEDED) |
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# Nothing to add... |
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elseif (CXX_FILESYSTEM_STDCPPFS_NEEDED) |
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target_link_libraries(std_filesystem INTERFACE -lstdc++fs) |
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elseif (CXX_FILESYSTEM_CPPFS_NEEDED) |
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target_link_libraries(std_filesystem INTERFACE -lc++fs) |
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elseif (CXX_FILESYSTEM_CPPEXP_NEEDED) |
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target_link_libraries(std_filesystem INTERFACE -lc++experimental) |
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endif () |
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add_library(std::filesystem ALIAS std_filesystem) |
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endif () |
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endif () |
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message("Found: ${_found}") |
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if (NOT _found AND "Boost" IN_LIST want_components) |
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message("-- Check for Boost::filesystem") |
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set(Boost_USE_STATIC_LIBS ON) |
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set(Boost_USE_MULTITHREADED ON) |
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find_package(Boost COMPONENTS filesystem) |
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if (TARGET Boost::filesystem) |
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set(_found TRUE) |
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set(CXX_FILESYSTEM_HEADER boost/filesystem.hpp CACHE STRING "The header that should be included to obtain the filesystem APIs" FORCE) |
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set(CXX_FILESYSTEM_NAMESPACE boost::filesystem CACHE STRING "The C++ namespace that contains the filesystem APIs" FORCE) |
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add_library(std_filesystem INTERFACE) |
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target_compile_features(std_filesystem INTERFACE cxx_std_17) |
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target_link_libraries(std_filesystem INTERFACE Boost::boost Boost::filesystem) |
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add_library(std::filesystem ALIAS std_filesystem) |
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endif () |
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elseif (NOT _found AND "ghc" IN_LIST want_components) |
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message("-- Using ghc::filesystem (git download)") |
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set (GHC_FILESYSTEM ghcFilesystem_git) |
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ExternalProject_Add(${GHC_FILESYSTEM} |
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GIT_REPOSITORY "https://github.com/gulrak/filesystem.git" |
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GIT_TAG "v1.3.2" |
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LOG_DOWNLOAD 1 |
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CONFIGURE_COMMAND "" |
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BUILD_COMMAND "" |
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UPDATE_COMMAND "" |
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INSTALL_COMMAND "" |
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) |
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set(_found TRUE) |
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set(CXX_FILESYSTEM_HEADER ghc/filesystem.hpp CACHE STRING "The header that should be included to obtain the filesystem APIs" FORCE) |
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set(CXX_FILESYSTEM_NAMESPACE ghc::filesystem CACHE STRING "The C++ namespace that contains the filesystem APIs" FORCE) |
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add_library(std_filesystem INTERFACE) |
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add_dependencies(std_filesystem ghcFilesystem_git) |
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target_compile_features(std_filesystem INTERFACE cxx_std_17) |
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ExternalProject_Get_Property(${GHC_FILESYSTEM} SOURCE_DIR) |
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file(MAKE_DIRECTORY "${SOURCE_DIR}/include") |
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target_include_directories(std_filesystem INTERFACE "${SOURCE_DIR}/include") |
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add_library(std::filesystem ALIAS std_filesystem) |
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endif () |
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cmake_pop_check_state() |
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set(Filesystem_FOUND ${_found} CACHE INTERNAL "TRUE if we can compile and link a program using std::filesystem") |
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if (Filesystem_FIND_REQUIRED AND NOT Filesystem_FOUND) |
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message(FATAL_ERROR "Cannot compile simple program using std::filesystem") |
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endif ()
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