From 3e5a7def80cd98c1450a7f7f616a5f079719b649 Mon Sep 17 00:00:00 2001 From: tastytea Date: Sat, 16 May 2020 17:17:33 +0200 Subject: [PATCH] Update CMake recipe. --- CMakeLists.txt | 34 +++--- cmake/FindFilesystem.cmake | 227 +++++++++++++++++++++++++++++++++++++ cmake/debug_flags.cmake | 57 ++++++++++ 3 files changed, 297 insertions(+), 21 deletions(-) create mode 100644 cmake/FindFilesystem.cmake create mode 100644 cmake/debug_flags.cmake diff --git a/CMakeLists.txt b/CMakeLists.txt index 8835624..b3f7a67 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -1,34 +1,26 @@ -cmake_minimum_required (VERSION 3.2) +cmake_minimum_required (VERSION 3.9...3.16) project(feiertagebot - LANGUAGES CXX -) + LANGUAGES CXX) + +list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake") include(GNUInstallDirs) find_package(PkgConfig REQUIRED) -pkg_check_modules(LIBXDG_BASEDIR REQUIRED libxdg-basedir) -pkg_check_modules(CURLPP REQUIRED curlpp) -pkg_check_modules(JSONCPP REQUIRED jsoncpp) +pkg_check_modules(libxdg-basedir REQUIRED IMPORTED_TARGET libxdg-basedir) +pkg_check_modules(curlpp REQUIRED IMPORTED_TARGET curlpp) +pkg_check_modules(jsoncpp REQUIRED IMPORTED_TARGET jsoncpp) +find_package(mastodonpp 0.5.4 REQUIRED CONFIG) +find_package(Filesystem REQUIRED) set(CMAKE_CXX_STANDARD 14) set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_EXTENSIONS OFF) -set(CMAKE_CXX_FLAGS_DEBUG - "${CMAKE_CXX_FLAGS_DEBUG} -Wpedantic -Wall -Wextra -ftrapv -fsanitize=undefined -g -Og -fno-omit-frame-pointer") - -include_directories(${PROJECT_BINARY_DIR}) -include_directories(${LIBXDG_BASEDIR_INCLUDE_DIRS}) -include_directories(${CURL_INCLUDE_DIRS}) -include_directories(${CURLPP_INCLUDE_DIRS}) -include_directories(${JSONCPP_INCLUDE_DIRS}) - -link_directories(${LIBXDG_BASEDIR_LIBRARY_DIRS}) -link_directories(${CURL_LIBRARY_DIRS}) -link_directories(${CURLPP_LIBRARY_DIRS}) -link_directories(${JSONCPP_LIBRARY_DIRS}) +include(debug_flags) add_executable(${CMAKE_PROJECT_NAME} feiertagebot.cpp xdgjson/src/xdgjson.cpp) target_link_libraries(${CMAKE_PROJECT_NAME} - "${LIBXDG_BASEDIR_LDFLAGS} ${CURLPP_LDFLAGS} ${JSONCPP_LDFLAGS}" - "-lstdc++fs -lmastodon-cpp") + PRIVATE + PkgConfig::libxdg-basedir PkgConfig::curlpp PkgConfig::jsoncpp + mastodonpp::mastodonpp std::filesystem) install(TARGETS ${CMAKE_PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR}) diff --git a/cmake/FindFilesystem.cmake b/cmake/FindFilesystem.cmake new file mode 100644 index 0000000..e71dd37 --- /dev/null +++ b/cmake/FindFilesystem.cmake @@ -0,0 +1,227 @@ +# Distributed under the OSI-approved BSD 3-Clause License. See accompanying +# file Copyright.txt or https://cmake.org/licensing for details. + +#[=======================================================================[.rst: + +FindFilesystem +############## + +This module supports the C++17 standard library's filesystem utilities. Use the +:imp-target:`std::filesystem` imported target to + +Options +******* + +The ``COMPONENTS`` argument to this module supports the following values: + +.. find-component:: Experimental + :name: fs.Experimental + + Allows the module to find the "experimental" Filesystem TS version of the + Filesystem library. This is the library that should be used with the + ``std::experimental::filesystem`` namespace. + +.. find-component:: Final + :name: fs.Final + + Finds the final C++17 standard version of the filesystem library. + +If no components are provided, behaves as if the +:find-component:`fs.Final` component was specified. + +If both :find-component:`fs.Experimental` and :find-component:`fs.Final` are +provided, first looks for ``Final``, and falls back to ``Experimental`` in case +of failure. If ``Final`` is found, :imp-target:`std::filesystem` and all +:ref:`variables ` will refer to the ``Final`` version. + + +Imported Targets +**************** + +.. imp-target:: std::filesystem + + The ``std::filesystem`` imported target is defined when any requested + version of the C++ filesystem library has been found, whether it is + *Experimental* or *Final*. + + If no version of the filesystem library is available, this target will not + be defined. + + .. note:: + This target has ``cxx_std_17`` as an ``INTERFACE`` + :ref:`compile language standard feature `. Linking + to this target will automatically enable C++17 if no later standard + version is already required on the linking target. + + +.. _fs.variables: + +Variables +********* + +.. variable:: CXX_FILESYSTEM_IS_EXPERIMENTAL + + Set to ``TRUE`` when the :find-component:`fs.Experimental` version of C++ + filesystem library was found, otherwise ``FALSE``. + +.. variable:: CXX_FILESYSTEM_HAVE_FS + + Set to ``TRUE`` when a filesystem header was found. + +.. variable:: CXX_FILESYSTEM_HEADER + + Set to either ``filesystem`` or ``experimental/filesystem`` depending on + whether :find-component:`fs.Final` or :find-component:`fs.Experimental` was + found. + +.. variable:: CXX_FILESYSTEM_NAMESPACE + + Set to either ``std::filesystem`` or ``std::experimental::filesystem`` + depending on whether :find-component:`fs.Final` or + :find-component:`fs.Experimental` was found. + + +Examples +******** + +Using `find_package(Filesystem)` with no component arguments: + +.. code-block:: cmake + + find_package(Filesystem REQUIRED) + + add_executable(my-program main.cpp) + target_link_libraries(my-program PRIVATE std::filesystem) + + +#]=======================================================================] + + +if(TARGET std::filesystem) + # This module has already been processed. Don't do it again. + return() +endif() + +include(CMakePushCheckState) +include(CheckIncludeFileCXX) +include(CheckCXXSourceCompiles) + +cmake_push_check_state() + +set(CMAKE_REQUIRED_QUIET ${Filesystem_FIND_QUIETLY}) + +# All of our tests required C++17 or later +set(CMAKE_CXX_STANDARD 17) + +# Normalize and check the component list we were given +set(want_components ${Filesystem_FIND_COMPONENTS}) +if(Filesystem_FIND_COMPONENTS STREQUAL "") + set(want_components Final) +endif() + +# Warn on any unrecognized components +set(extra_components ${want_components}) +list(REMOVE_ITEM extra_components Final Experimental) +foreach(component IN LISTS extra_components) + message(WARNING "Extraneous find_package component for Filesystem: ${component}") +endforeach() + +# Detect which of Experimental and Final we should look for +set(find_experimental TRUE) +set(find_final TRUE) +if(NOT "Final" IN_LIST want_components) + set(find_final FALSE) +endif() +if(NOT "Experimental" IN_LIST want_components) + set(find_experimental FALSE) +endif() + +if(find_final) + check_include_file_cxx("filesystem" _CXX_FILESYSTEM_HAVE_HEADER) + mark_as_advanced(_CXX_FILESYSTEM_HAVE_HEADER) + if(_CXX_FILESYSTEM_HAVE_HEADER) + # We found the non-experimental header. Don't bother looking for the + # experimental one. + set(find_experimental FALSE) + endif() +else() + set(_CXX_FILESYSTEM_HAVE_HEADER FALSE) +endif() + +if(find_experimental) + check_include_file_cxx("experimental/filesystem" _CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) + mark_as_advanced(_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) +else() + set(_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER FALSE) +endif() + +if(_CXX_FILESYSTEM_HAVE_HEADER) + set(_have_fs TRUE) + set(_fs_header filesystem) + set(_fs_namespace std::filesystem) +elseif(_CXX_FILESYSTEM_HAVE_EXPERIMENTAL_HEADER) + set(_have_fs TRUE) + set(_fs_header experimental/filesystem) + set(_fs_namespace std::experimental::filesystem) +else() + set(_have_fs FALSE) +endif() + +set(CXX_FILESYSTEM_HAVE_FS ${_have_fs} CACHE BOOL "TRUE if we have the C++ filesystem headers") +set(CXX_FILESYSTEM_HEADER ${_fs_header} CACHE STRING "The header that should be included to obtain the filesystem APIs") +set(CXX_FILESYSTEM_NAMESPACE ${_fs_namespace} CACHE STRING "The C++ namespace that contains the filesystem APIs") + +set(_found FALSE) + +if(CXX_FILESYSTEM_HAVE_FS) + # We have some filesystem library available. Do link checks + string(CONFIGURE [[ + #include <@CXX_FILESYSTEM_HEADER@> + + int main() { + auto cwd = @CXX_FILESYSTEM_NAMESPACE@::current_path(); + return static_cast(cwd.string().size()); + } + ]] code @ONLY) + + # Try to compile a simple filesystem program without any linker flags + check_cxx_source_compiles("${code}" CXX_FILESYSTEM_NO_LINK_NEEDED) + + set(can_link ${CXX_FILESYSTEM_NO_LINK_NEEDED}) + + if(NOT CXX_FILESYSTEM_NO_LINK_NEEDED) + set(prev_libraries ${CMAKE_REQUIRED_LIBRARIES}) + # Add the libstdc++ flag + set(CMAKE_REQUIRED_LIBRARIES ${prev_libraries} -lstdc++fs) + check_cxx_source_compiles("${code}" CXX_FILESYSTEM_STDCPPFS_NEEDED) + set(can_link ${CXX_FILESYSTEM_STDCPPFS_NEEDED}) + if(NOT CXX_FILESYSTEM_STDCPPFS_NEEDED) + # Try the libc++ flag + set(CMAKE_REQUIRED_LIBRARIES ${prev_libraries} -lc++fs) + check_cxx_source_compiles("${code}" CXX_FILESYSTEM_CPPFS_NEEDED) + set(can_link ${CXX_FILESYSTEM_CPPFS_NEEDED}) + endif() + endif() + + if(can_link) + add_library(std::filesystem INTERFACE IMPORTED) + target_compile_features(std::filesystem INTERFACE cxx_std_17) + set(_found TRUE) + + if(CXX_FILESYSTEM_NO_LINK_NEEDED) + # Nothing to add... + elseif(CXX_FILESYSTEM_STDCPPFS_NEEDED) + target_link_libraries(std::filesystem INTERFACE -lstdc++fs) + elseif(CXX_FILESYSTEM_CPPFS_NEEDED) + target_link_libraries(std::filesystem INTERFACE -lc++fs) + endif() + endif() +endif() + +cmake_pop_check_state() + +set(Filesystem_FOUND ${_found} CACHE BOOL "TRUE if we can compile and link a program using std::filesystem" FORCE) + +if(Filesystem_FIND_REQUIRED AND NOT Filesystem_FOUND) + message(FATAL_ERROR "Cannot Compile simple program using std::filesystem") +endif() diff --git a/cmake/debug_flags.cmake b/cmake/debug_flags.cmake new file mode 100644 index 0000000..6f177d9 --- /dev/null +++ b/cmake/debug_flags.cmake @@ -0,0 +1,57 @@ +# Set compiler flags for Debug builds. +# Only has an effect on GCC/Clang >= 5.0. + +set(DEBUG_CXXFLAGS "") +if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang" + AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "5") + list(APPEND DEBUG_CXXFLAGS + "-Wall" + "-Wextra" + "-Wpedantic" + "-Wuninitialized" + "-Wshadow" + "-Wnon-virtual-dtor" + "-Wconversion" + "-Wsign-conversion" + "-Wold-style-cast" + "-Wzero-as-null-pointer-constant" + "-Wmissing-declarations" + "-Wcast-align" + "-Wunused" + "-Woverloaded-virtual" + "-Wdouble-promotion" + "-Wformat=2" + "-ftrapv" + "-fsanitize=undefined" + "-Og" + "-fno-omit-frame-pointer") + if(CMAKE_CXX_COMPILER_ID MATCHES "GNU") + list(APPEND DEBUG_CXXFLAGS + "-Wlogical-op" + "-Wuseless-cast") + if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "6") + list(APPEND DEBUG_CXXFLAGS + "-Wmisleading-indentation" + "-Wduplicated-cond" + "-Wnull-dereference") + if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "7") + list(APPEND DEBUG_CXXFLAGS + "-Wduplicated-branches") + endif() + endif() + endif() + add_compile_options("$<$:${DEBUG_CXXFLAGS}>") + + set(DEBUG_LDFLAGS + "-fsanitize=undefined") + # add_link_options was introduced in version 3.13. + if(${CMAKE_VERSION} VERSION_LESS 3.13) + set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}") + else() + add_link_options("$<$:${DEBUG_LDFLAGS}>") + endif() +else() + message(STATUS + "No additional compiler flags were set, " + "because your compiler was not anticipated.") +endif()