build: Enable link time optimization in release builds. (#6887)

.github/workflows/ci.yml

@@ -158,6 +158,11 @@ jobs:
           key: ${{ runner.os }}-${{ matrix.target }}-${{ github.sha }}
           restore-keys: |
             ${{ runner.os }}-${{ matrix.target }}-
+      - name: Increase Pagefile size
+        uses: al-cheb/configure-pagefile-action@v1.2
+        with:
+          minimum-size: 2GB
+          maximum-size: 6GB
       - name: Set up MSVC
         uses: ilammy/msvc-dev-cmd@v1
         if: ${{ matrix.target == 'msvc' }}

CMakeLists.txt

@@ -40,8 +40,10 @@ endif()
 
 if (CMAKE_BUILD_TYPE STREQUAL Debug)
     set(IS_DEBUG_BUILD ON)
+    set(IS_RELEASE_BUILD OFF)
 else()
     set(IS_DEBUG_BUILD OFF)
+    set(IS_RELEASE_BUILD ON)
 endif()
 
 option(ENABLE_SDL2 "Enable using SDL2" ON)
@@ -73,7 +75,7 @@ CMAKE_DEPENDENT_OPTION(CITRA_ENABLE_BUNDLE_TARGET "Enable the distribution bundl
 
 # Compile options
 CMAKE_DEPENDENT_OPTION(COMPILE_WITH_DWARF "Add DWARF debugging information" ${IS_DEBUG_BUILD} "MINGW" OFF)
-option(ENABLE_LTO "Enable link time optimization" OFF)
+option(ENABLE_LTO "Enable link time optimization" ${IS_RELEASE_BUILD})
 option(CITRA_USE_PRECOMPILED_HEADERS "Use precompiled headers" ON)
 option(CITRA_WARNINGS_AS_ERRORS "Enable warnings as errors" ON)
 

src/CMakeLists.txt

@@ -5,6 +5,10 @@ include_directories(.)
 set_property(DIRECTORY APPEND PROPERTY
     COMPILE_DEFINITIONS $<$<CONFIG:Debug>:_DEBUG> $<$<NOT:$<CONFIG:Debug>>:NDEBUG>)
 
+if (ENABLE_LTO)
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+endif()
+
 # Set compilation flags
 if (MSVC)
     set(CMAKE_CONFIGURATION_TYPES Debug Release CACHE STRING "" FORCE)

src/audio_core/CMakeLists.txt

@@ -49,7 +49,6 @@ create_target_directory_groups(audio_core)
 
 target_link_libraries(audio_core PUBLIC citra_common citra_core)
 target_link_libraries(audio_core PRIVATE SoundTouch teakra)
-set_target_properties(audio_core PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 add_definitions(-DSOUNDTOUCH_INTEGER_SAMPLES)
 
 if(ENABLE_MF)

src/common/CMakeLists.txt

@@ -167,7 +167,6 @@ create_target_directory_groups(citra_common)
 
 target_link_libraries(citra_common PUBLIC fmt::fmt library-headers microprofile Boost::boost Boost::serialization Boost::iostreams)
 target_link_libraries(citra_common PRIVATE libzstd_static)
-set_target_properties(citra_common PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 
 if ("x86_64" IN_LIST ARCHITECTURE)
     target_link_libraries(citra_common PRIVATE xbyak)

src/core/CMakeLists.txt

@@ -480,7 +480,6 @@ create_target_directory_groups(citra_core)
 target_link_libraries(citra_core PUBLIC citra_common PRIVATE audio_core network video_core)
 target_link_libraries(citra_core PRIVATE Boost::boost Boost::serialization Boost::iostreams httplib)
 target_link_libraries(citra_core PUBLIC dds-ktx PRIVATE cryptopp fmt::fmt lodepng open_source_archives)
-set_target_properties(citra_core PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 
 if (ENABLE_WEB_SERVICE)
     target_link_libraries(citra_core PRIVATE web_service)

src/input_common/CMakeLists.txt

@@ -43,7 +43,6 @@ endif()
 
 create_target_directory_groups(input_common)
 target_link_libraries(input_common PUBLIC citra_core PRIVATE citra_common ${Boost_LIBRARIES})
-set_target_properties(input_common PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 
 if (CITRA_USE_PRECOMPILED_HEADERS)
     target_precompile_headers(input_common PRIVATE precompiled_headers.h)

src/network/CMakeLists.txt

@@ -23,7 +23,6 @@ if (ENABLE_WEB_SERVICE)
 endif()
 
 target_link_libraries(network PRIVATE citra_common enet Boost::serialization httplib)
-set_target_properties(network PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 
 if (CITRA_USE_PRECOMPILED_HEADERS)
     target_precompile_headers(network PRIVATE precompiled_headers.h)

src/video_core/CMakeLists.txt

@@ -143,7 +143,6 @@ create_target_directory_groups(video_core)
 target_link_libraries(video_core PUBLIC citra_common citra_core)
 target_link_libraries(video_core PRIVATE Boost::serialization dds-ktx json-headers nihstro-headers tsl::robin_map)
 target_link_libraries(video_core PRIVATE vulkan-headers vma glad sirit SPIRV glslang)
-set_target_properties(video_core PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 
 if ("x86_64" IN_LIST ARCHITECTURE)
     target_link_libraries(video_core PUBLIC xbyak)

src/web_service/CMakeLists.txt

@@ -17,7 +17,6 @@ create_target_directory_groups(web_service)
 target_compile_definitions(web_service PUBLIC -DENABLE_WEB_SERVICE)
 target_link_libraries(web_service PRIVATE citra_common network json-headers httplib cpp-jwt)
 target_link_libraries(web_service PUBLIC ${OPENSSL_LIBS})
-set_target_properties(web_service PROPERTIES INTERPROCEDURAL_OPTIMIZATION ${ENABLE_LTO})
 if (ANDROID)
     target_link_libraries(web_service PRIVATE ifaddrs)
 elseif(WIN32)