Remove flags which have already been defined in configure.cmake.

Add a note to investigate -felide-constructors usage on OSX.

cmake/build_configurations/mysql_release.cmake

@@ -136,7 +136,7 @@ IF(UNIX)
     SET(CMAKE_C_FLAGS_RELWITHDEBINFO "-O3 ${COMMON_C_FLAGS}")
   ENDIF()
   IF(CMAKE_COMPILER_IS_GNUCXX)
-    SET(COMMON_CXX_FLAGS               "-g -static-libgcc -fno-omit-frame-pointer -fno-implicit-templates -felide-constructors -fno-exceptions -fno-rtti")
+    SET(COMMON_CXX_FLAGS               "-g -static-libgcc -fno-omit-frame-pointer")
     SET(CMAKE_CXX_FLAGS_DEBUG          "-O ${COMMON_CXX_FLAGS}")
     SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O3 ${COMMON_CXX_FLAGS}")
   ENDIF()
@@ -161,7 +161,7 @@ IF(UNIX)
   IF(CMAKE_SYSTEM_NAME MATCHES "Linux")
     IF(CMAKE_C_COMPILER_ID MATCHES "Intel")
       SET(COMMON_C_FLAGS                 "-static-intel -static-libgcc -g -mp -restrict")
-      SET(COMMON_CXX_FLAGS               "-static-intel -static-libgcc -g -mp -restrict -fno-implicit-templates -fno-exceptions -fno-rtti")
+      SET(COMMON_CXX_FLAGS               "-static-intel -static-libgcc -g -mp -restrict -fno-exceptions -fno-rtti")
       IF(CMAKE_SYSTEM_PROCESSOR MATCHES "ia64")
         SET(COMMON_C_FLAGS               "${COMMON_C_FLAGS} -no-ftz -no-prefetch")
         SET(COMMON_CXX_FLAGS             "${COMMON_CXX_FLAGS} -no-ftz -no-prefetch")
@@ -177,7 +177,8 @@ IF(UNIX)
   # OSX flags
   IF(APPLE)
     SET(COMMON_C_FLAGS                 "-g -fno-common")
-    SET(COMMON_CXX_FLAGS               "-g -fno-common -felide-constructors -fno-implicit-templates -fno-exceptions -fno-rtti")
+    # XXX: why are we using -felide-constructors on OSX?
+    SET(COMMON_CXX_FLAGS               "-g -fno-common -felide-constructors")
     SET(CMAKE_C_FLAGS_DEBUG            "-O ${COMMON_C_FLAGS}")
     SET(CMAKE_CXX_FLAGS_DEBUG          "-O ${COMMON_CXX_FLAGS}")
     SET(CMAKE_C_FLAGS_RELWITHDEBINFO   "-Os ${COMMON_C_FLAGS}")