Prepare upcoming GCC 4.8 release.

o Add -Wno-unused-parameter -Wno-unused-but-set-parameter to suppress
  new warnings.
o Define GCC_COLORS to enable colorful diagnostic messages.

Change-Id: Icbd62300b0e6f39d4e514edec2431a06b4d72421
(cherry picked from internal commit ccd8e6082b)

core/combo/TARGET_linux-arm.mk

@@ -113,9 +113,10 @@ TARGET_GLOBAL_CFLAGS += $(TARGET_ANDROID_CONFIG_CFLAGS)
 # We cannot turn it off blindly since the option is not available
 # in gcc-4.4.x.  We also want to disable sincos optimization globally
 # by turning off the builtin sin function.
-ifneq ($(filter 4.6 4.6.% 4.7 4.7.%, $(TARGET_GCC_VERSION)),)
+ifneq ($(filter 4.6 4.6.% 4.7 4.7.% 4.8, $(TARGET_GCC_VERSION)),)
 TARGET_GLOBAL_CFLAGS += -Wno-unused-but-set-variable -fno-builtin-sin \
-			-fno-strict-volatile-bitfields
+			-fno-strict-volatile-bitfields \
+			-Wno-unused-parameter -Wno-unused-but-set-parameter
 endif
 
 # This is to avoid the dreaded warning compiler message:

core/llvm_config.mk

@@ -97,9 +97,11 @@ TARGET_thumb_CLANG_CFLAGS += $(filter-out $(CLANG_CONFIG_UNKNOWN_CFLAGS),$(TARGE
 $(call clang-flags-subst,-march=armv5te,-march=armv5t)
 $(call clang-flags-subst,-march=armv5e,-march=armv5)
 
-# clang does not support -Wno-psabi and -Wno-unused-but-set-variable
+# clang does not support -Wno-psabi, -Wno-unused-but-set-variable, and
+# -Wno-unused-but-set-parameter
 $(call clang-flags-subst,-Wno-psabi,)
 $(call clang-flags-subst,-Wno-unused-but-set-variable,)
+$(call clang-flags-subst,-Wno-unused-but-set-parameter,)
 
 # clang does not support -mcpu=cortex-a15 yet - fall back to armv7-a for now
 $(call clang-flags-subst,-mcpu=cortex-a15,-march=armv7-a)

envsetup.sh

@@ -205,6 +205,8 @@ function set_stuff_for_environment()
     set_sequence_number
 
     export ANDROID_BUILD_TOP=$(gettop)
+    # With this environment variable new GCC can apply colors to warnings/errors
+    export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'
 }
 
 function set_sequence_number()