OptionsWPE: compile with -ffunction-sections -fdata-sections, link with --gc-sections.

Author: zdobersek

Source/cmake/OptionsWPE.cmake

@@ -473,3 +473,10 @@ set(WPEWebProcessExtension_Uninstalled_PKGCONFIG_FILE ${CMAKE_BINARY_DIR}/${WPE_
 
 include(BubblewrapSandboxChecks)
 include(GStreamerChecks)
+
+# Optimize binary size for release builds by removing dead sections on unix/gcc.
+if (CMAKE_COMPILER_IS_GNUCC AND UNIX AND NOT APPLE)
+    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -ffunction-sections -fdata-sections")
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffunction-sections -fdata-sections -fno-rtti")
+    set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} -Wl,--gc-sections")
+endif ()