Enable optimizations while building in release mode

In order to use GCC's -flto with standard ld, lwan.a isn't generated; the
binary is built by linking with the object files directly.

CMakeLists.txt

@@ -3,6 +3,11 @@ cmake_minimum_required(VERSION 2.6)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wshadow")
 
+if (${CMAKE_BUILD_TYPE} MATCHES "Release")
+	message(STATUS "Enabling compiler optimizations")
+	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mtune=native -O3 -flto")
+endif ()
+
 find_package(Threads)
 find_library(TCMALLOC_LIBRARY NAMES tcmalloc /usr/lib /usr/local/lib)
 if (TCMALLOC_LIBRARY)
@@ -20,7 +25,8 @@ else ()
 	message(STATUS "Valgrind headers not found -- disabling valgrind support")
 endif()
 
-add_library(wan
+add_executable(lwan
+	main.c
 	lwan.c
 	lwan-coro.c
 	lwan-trie.c
@@ -33,16 +39,7 @@ add_library(wan
 	strbuf.c
 )
 
-target_link_libraries(wan
-	${CMAKE_THREAD_LIBS_INIT})
-set_target_properties(wan
-	PROPERTIES PREFIX "l")
-
-add_executable(lwan
-	main.c)
-
 target_link_libraries(lwan
-	wan
 	${CMAKE_THREAD_LIBS_INIT}
 	${TCMALLOC_LIBRARY}
 )