Rewrite root CMake recipe.

CMakeLists.txt

@@ -1,47 +1,40 @@
-cmake_minimum_required (VERSION 3.6)
+# Support version 3.9 and above, but use policy settings up to 3.14.
+# 3.9 is needed for project description.
+cmake_minimum_required(VERSION 3.9...3.14)
+# Ranges are supported from 3.12, set policy to current for < 3.12.
+if(${CMAKE_VERSION} VERSION_LESS 3.12)
+  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
+endif()
+
+# Global build options.
+set(CMAKE_BUILD_TYPE "Release" CACHE STRING "The type of build.")
+option(BUILD_SHARED_LIBS "Build shared libraries." YES)
+
 project (mastorss
-         VERSION 0.9.0
-         LANGUAGES CXX
-)
+  VERSION 0.9.9999
+  DESCRIPTION "Another RSS to Mastodon bot."
+  LANGUAGES CXX)
 
-include(GNUInstallDirs)
-find_package(CURL REQUIRED)
-find_package(Boost REQUIRED COMPONENTS system filesystem)
-find_package(PkgConfig REQUIRED)
-pkg_check_modules(CURLPP REQUIRED curlpp)
-pkg_check_modules(JSONCPP REQUIRED jsoncpp)
+list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
 
-set(CMAKE_CXX_STANDARD 14)
+# Project build options.
+option(WITH_MAN "Compile and install manpage." YES)
+option(WITH_TESTS "Compile tests." NO)
+
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-include_directories(${PROJECT_SOURCE_DIR}/src)
-include_directories(${PROJECT_BINARY_DIR})
+include(debug_flags)
 
-include_directories(${CURL_INCLUDE_DIR})
-include_directories(${CURLPP_INCLUDE_DIR})
-include_directories(${JSONCPP_INCLUDE_DIR})
-include_directories(${Boost_INCLUDE_DIRS})
+add_subdirectory(src)
 
-link_directories(${CURL_LIBRARY_DIRS})
-link_directories(${CURLPP_LIBRARY_DIRS})
-link_directories(${JSONCPP_LIBRARY_DIRS})
-link_directories(${Boost_LIBRARY_DIRS})
+if(WITH_MAN)
+  add_subdirectory(man)
+endif()
 
-add_definitions(${Boost_DEFINITIONS})
+# if(WITH_TESTS)
+#   add_subdirectory(tests)
+# endif()
 
-# Write version in header
-configure_file (
-    "${PROJECT_SOURCE_DIR}/src/version.hpp.in"
-    "${PROJECT_BINARY_DIR}/version.hpp"
-)
-
-file(GLOB sources src/*.cpp)
-add_executable(mastorss ${sources})
-target_link_libraries(mastorss
-                      mastodon-cpp ${CURLPP_LIBRARIES}
-                      ${JSONCPP_LIBRARIES} ${Boost_LIBRARIES} stdc++fs)
-install(TARGETS mastorss DESTINATION ${CMAKE_INSTALL_BINDIR})
-
-install(FILES watchwords.json
-        DESTINATION ${CMAKE_INSTALL_DATADIR}/mastorss)
+# include(cmake/packages.cmake)

cmake/debug_flags.cmake

@@ -0,0 +1,58 @@
+# 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"
+    "-g"
+    "-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("$<$<CONFIG:Debug>:${DEBUG_CXXFLAGS}>")
+
+  set(DEBUG_LDFLAGS
+    "-fsanitize=undefined")
+  # add_link_options was introduced in version 3.13.
+  if(${CMAKE_VERSION} VERSION_LESS 3.13)
+    set(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${DEBUG_LDFLAGS}")
+  else()
+    add_link_options("$<$<CONFIG:Debug>:${DEBUG_LDFLAGS}>")
+  endif()
+else()
+  message(STATUS
+    "No additional compiler flags were set, "
+    "because your compiler was not anticipated.")
+endif()

src/CMakeLists.txt

@@ -0,0 +1,37 @@
+include(GNUInstallDirs)
+find_package(CURL REQUIRED)
+find_package(Boost REQUIRED COMPONENTS system filesystem)
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(CURLPP REQUIRED curlpp)
+pkg_check_modules(JSONCPP REQUIRED jsoncpp)
+
+include_directories(${PROJECT_SOURCE_DIR}/src)
+include_directories(${PROJECT_BINARY_DIR})
+
+include_directories(${CURL_INCLUDE_DIR})
+include_directories(${CURLPP_INCLUDE_DIR})
+include_directories(${JSONCPP_INCLUDE_DIR})
+include_directories(${Boost_INCLUDE_DIRS})
+
+link_directories(${CURL_LIBRARY_DIRS})
+link_directories(${CURLPP_LIBRARY_DIRS})
+link_directories(${JSONCPP_LIBRARY_DIRS})
+link_directories(${Boost_LIBRARY_DIRS})
+
+add_definitions(${Boost_DEFINITIONS})
+
+# Write version in header
+configure_file (
+    "${PROJECT_SOURCE_DIR}/src/version.hpp.in"
+    "${PROJECT_BINARY_DIR}/version.hpp"
+)
+
+file(GLOB sources *.cpp)
+add_executable(mastorss ${sources})
+target_link_libraries(mastorss
+                      mastodon-cpp ${CURLPP_LIBRARIES}
+                      ${JSONCPP_LIBRARIES} ${Boost_LIBRARIES} stdc++fs)
+install(TARGETS mastorss DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+install(FILES watchwords.json
+        DESTINATION ${CMAKE_INSTALL_DATADIR}/mastorss)