cmake: use GNUInstallDirs for install paths + install everything (optionally)

CMakeLists.txt

@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.2.2)
 
 project(OpenRW)
 
+include(GNUInstallDirs)
+
 # Read the configuration arguments
 include("${PROJECT_SOURCE_DIR}/cmake_options.cmake")
 
@@ -38,11 +40,9 @@ if(BUILD_TESTS)
 endif()
 
 # Copy the license to the install directory
-if(CMAKE_SYSTEM_NAME MATCHES "Linux|FreeBSD")
-    install(FILES COPYING
-        DESTINATION "${DOC_DIR}"
-        )
-endif()
+install(FILES COPYING
+    DESTINATION "${CMAKE_INSTALL_DOCDIR}"
+    )
 
 # Copy the license to the build directory (for CI)
 file(COPY COPYING

cmake_options.cmake

@@ -14,8 +14,7 @@ set_property(CACHE FAILED_CHECK_ACTION PROPERTY STRINGS "IGNORE" "ABORT" "BREAKP
 set(FILESYSTEM_LIBRARY "BOOST" CACHE STRING "Which filesystem library to use")
 set_property(CACHE FILESYSTEM_LIBRARY PROPERTY STRINGS "CXX17" "CXXTS" "BOOST")
 
-set(BIN_DIR "bin" CACHE STRING "Prefix subdirectory to put the binaries in.")
-set(DOC_DIR "share/doc/openrw" CACHE STRING "Prefix subdirectory to put the documentation in.")
+option(INSTALL_LIBS "Install rwengine libraries")
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build, options are: Debug Release")

rwengine/CMakeLists.txt

@@ -159,3 +159,10 @@ target_include_directories(rwengine
     )
 
 openrw_target_apply_options(TARGET rwengine)
+
+if(INSTALL_LIBS)
+    install(TARGETS rwengine
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        )
+endif()

rwgame/CMakeLists.txt

@@ -65,4 +65,6 @@ target_link_libraries(rwgame
 
 openrw_target_apply_options(TARGET rwgame)
 
-install(TARGETS rwgame RUNTIME DESTINATION "${BIN_DIR}")
+install(TARGETS rwgame
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+    )

rwlib/CMakeLists.txt

@@ -64,3 +64,10 @@ target_link_libraries(rwlib
     )
 
 openrw_target_apply_options(TARGET rwlib)
+
+if(INSTALL_LIBS)
+    install(TARGETS rwlib
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        )
+endif()

rwviewer/CMakeLists.txt

@@ -35,5 +35,5 @@ target_link_libraries(rwviewer
 openrw_target_apply_options(TARGET rwviewer)
 
 install(TARGETS rwviewer
-    RUNTIME DESTINATION "${BIN_DIR}"
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
     )

tests/CMakeLists.txt

@@ -114,3 +114,7 @@ else()
             TIMEOUT 300
         )
 endif()
+
+install(TARGETS rwtests
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
+    )