diff -r 6feaf9a863dd -r 8e742c9ffdf8 cmake_modules/compilerchecks.cmake
--- a/cmake_modules/compilerchecks.cmake	Tue Jan 06 16:38:39 2015 +0100
+++ b/cmake_modules/compilerchecks.cmake	Thu Jan 15 11:48:28 2015 +0100
@@ -62,7 +62,7 @@
         endif()
     endif()
 
-    if(CMAKE_BUILD_TYPE MATCHES "RELEASE")
+    if(CMAKE_BUILD_TYPE MATCHES "RELEASE" OR CMAKE_BUILD_TYPE MATCHES "RELWITHDEBINFO")
         set(CMAKE_REQUIRED_FLAGS "-Wl,--as-needed")
         check_c_compiler_flag("" HAVE_ASNEEDED)
         if(HAVE_ASNEEDED)