Build shared libraries by default; enable gold linker by default

Author: dgrove-oss

CMakeLists.txt

@@ -24,10 +24,11 @@ include(DispatchAppleOptions)
 option(ENABLE_DISPATCH_INIT_CONSTRUCTOR "enable libdispatch_init as a constructor" ON)
 set(USE_LIBDISPATCH_INIT_CONSTRUCTOR ${ENABLE_DISPATCH_INIT_CONSTRUCTOR})
 
-# TODO(compnerd) swift options
+option(BUILD_SHARED_LIBS "build shared libraries" ON)
+
+option(USE_GOLD_LINKER "use the gold linker" ON)
 
-# TODO(compnerd) consider adding a flag for USE_GOLD_LINKER.  Currently, we
-# expect the user to specify `-fuse-ld=gold`
+# TODO(compnerd) swift options
 
 option(ENABLE_THREAD_LOCAL_STORAGE "enable usage of thread local storage via __thread" ON)
 set(DISPATCH_USE_THREAD_LOCAL_STORAGE ${ENABLE_THREAD_LOCAL_STORAGE})

src/CMakeLists.txt

@@ -111,6 +111,11 @@ target_include_directories(dispatch
                              ${CMAKE_SOURCE_DIR}
                              ${CMAKE_CURRENT_SOURCE_DIR}
                              ${CMAKE_SOURCE_DIR}/private)
+if (USE_GOLD_LINKER)
+  target_link_libraries(dispatch
+	                    PRIVATE
+	                    -fuse-ld=gold)
+endif()
 if(WITH_PTHREAD_WORKQUEUES)
   target_include_directories(dispatch
                              SYSTEM BEFORE PRIVATE