CMake: Add install target

Do **not** use this with /usr or /usr/local. It creates subdirectories
for resources/translations in the install prefix.

It's intended for creating a relocatable, self-contained bundle, which
can be packaged.

CMakeModules/DuckStationBuildOptions.cmake

@@ -9,6 +9,7 @@ option(BUILD_TESTS "Build unit tests" OFF)
 if(LINUX OR BSD)
   option(ENABLE_X11 "Support X11 window system" ON)
   option(ENABLE_WAYLAND "Support Wayland window system" ON)
+  option(ALLOW_INSTALL "Allow installation to CMAKE_INSTALL_PREFIX" OFF)
 endif()
 if(APPLE)
   option(SKIP_POSTPROCESS_BUNDLE "Disable bundle post-processing, including Qt additions" OFF)

CMakeModules/DuckStationBuildSummary.cmake

@@ -24,6 +24,12 @@ if(BUILD_TESTS)
   message(STATUS "Building unit tests.")
 endif()
 
+if(ALLOW_INSTALL)
+  message(WARNING "Install target is enabled. This will install all DuckStation files into:
+  ${CMAKE_INSTALL_PREFIX}
+It does **not** use the LSB subdirectories of bin, share, etc, so you should disable this option if it is set to /usr or /usr/local.")
+endif()
+
 if(NOT IS_SUPPORTED_COMPILER)
   message(WARNING "
 *************** UNSUPPORTED CONFIGURATION ***************

CMakeModules/DuckStationUtils.cmake

@@ -221,3 +221,9 @@ function(get_scm_version)
     set(SCM_VERSION ${LOCAL_SCM_VERSION} PARENT_SCOPE)
   endif()
 endfunction()
+
+function(install_imported_dep_library name)
+  get_target_property(SONAME "${name}" IMPORTED_SONAME_RELEASE)
+  get_target_property(LOCATION "${name}" IMPORTED_LOCATION_RELEASE)
+  install(FILES "${LOCATION}" RENAME "${SONAME}" DESTINATION "${CMAKE_INSTALL_PREFIX}")
+endfunction()

src/core/CMakeLists.txt

@@ -214,4 +214,8 @@ function(add_core_resources target)
     endif()
     add_resources(${target} ${path} ${CMAKE_SOURCE_DIR}/data/resources/)
   endforeach()
+  if(ALLOW_INSTALL)
+    install_imported_dep_library(cpuinfo::cpuinfo)
+    install(DIRECTORY "$<TARGET_FILE_DIR:${target}>/resources" DESTINATION "${CMAKE_INSTALL_PREFIX}")
+  endif()
 endfunction()

src/duckstation-qt/CMakeLists.txt

@@ -249,6 +249,11 @@ elseif(APPLE)
   set_source_files_properties("${CMAKE_CURRENT_SOURCE_DIR}/DuckStation.icns" PROPERTIES MACOSX_PACKAGE_LOCATION Resources)
 endif()
 
+if(ALLOW_INSTALL)
+  # Install main binary.
+  install(TARGETS duckstation-qt RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}")
+endif()
+
 # Compile qrc to a binary file.
 if(NOT APPLE)
   set(RCC_FILE "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/resources/duckstation-qt.rcc")
@@ -271,6 +276,9 @@ if(NOT APPLE)
   foreach (QM_FILE IN LISTS QM_FILES)
     get_filename_component(QM_FILE_NAME ${QM_FILE} NAME)
     add_custom_command(TARGET duckstation-qt POST_BUILD COMMAND "${CMAKE_COMMAND}" -E copy_if_different "${QM_FILE}" "${QM_OUTPUT_DIR}/${QM_FILE_NAME}")
+    if(ALLOW_INSTALL)
+      install(FILES "${QM_FILE}" DESTINATION "${CMAKE_INSTALL_PREFIX}/translations")
+    endif()
   endforeach()
 else()
   foreach (QM_FILE IN LISTS QM_FILES)

src/util/CMakeLists.txt

@@ -306,5 +306,13 @@ function(add_util_resources target)
       target_sources(${target} PRIVATE ${version_lib})
       set_source_files_properties(${target} PRIVATE ${version_lib} PROPERTIES MACOSX_PACKAGE_LOCATION Frameworks)
     endforeach()
+  elseif(ALLOW_INSTALL)
+    # Ensure we look for dependency libraries in the installation directory.
+    set_target_properties(${target} PROPERTIES INSTALL_RPATH "$ORIGIN")
+
+    # Copy dependency libraries to installation directory.
+    install_imported_dep_library(Shaderc::shaderc_shared)
+    install_imported_dep_library(spirv-cross-c-shared)
+    install_imported_dep_library(SoundTouch::SoundTouchDLL)
   endif()
 endfunction()