documented some disabled clang compiler warnings / re-enabled -Wformat-security for clang 3.5 (was disabled because of a bug in clang) / disabled c++11 warnings so it compiles out-of-the-box / added TODO (nw)

src/build/flags_clang.mak

@@ -1,11 +1,14 @@
-# TODO: some of these are no longer necessary for newer clang versions - re-enable them
 CCOMFLAGS += \
 	-Wno-cast-align \
 	-Wno-tautological-compare \
 	-Wno-constant-logical-operand \
-	-Wno-format-security \
-	-Wno-shift-count-overflow \
-	-Wno-self-assign-field
+	-Wno-format-security
+
+# caused by obj/sdl64d/emu/cpu/tms57002/tms57002.inc
+CCOMFLAGS += -Wno-self-assign-field
+
+# caused by src/emu/cpu/tms34010/34010gfx.c
+CCOMFLAGS += -Wno-shift-count-overflow
 
 # TODO: needs to use $(CC)
 TEST_CLANG := $(shell clang --version)
@@ -16,7 +19,12 @@ endif
 
 ifeq ($(findstring 3.5,$(TEST_CLANG)),3.5)
 CCOMFLAGS += -Wno-inline-new-delete -Wno-absolute-value -Wno-dynamic-class-memaccess
-# XCode 6.0.1 is built on a pre-release SVN version of clang 3.5, that doesn't support -Wno-absolute-value yet - so ignore that warning for now
+# these were disabled because of bugs in older clang versions
+CCOMFLAGS += -Wformat-security
+# these show up when compiling as c++11
+CCOMFLAGS += -Wno-deprecated-register -Wno-reserved-user-defined-literal -Wno-c++11-narrowing
+# TODO: add proper detection of XCode 6.0.1
+# XCode 6.0.1 is built on a pre-release SVN version of clang 3.5, that doesn't support -Wno-absolute-value yet
 CCOMFLAGS += -Wno-unknown-warning-option
 # XCode 6.0.1 gives this when using SDL2 in /Library/Frameworks/SDL2.framework/Headers/SDL_syswm.h:150 included from src/osd/sdl/sdlinc.h
 CCOMFLAGS += -Wno-extern-c-compat