arm, powerpc: Update cc-version tests to check for cc-name as well

For compatibility clang will report some gcc version.  However since we
are checking gcc versions in order to then fail to build, we should
limit these tests only to when we are using gcc and not clang.

Signed-off-by: Tom Rini <trini@konsulko.com>

arch/arm/config.mk

@@ -40,7 +40,8 @@ ifeq ($(CONFIG_SYS_THUMB_BUILD),y)
 archprepare: checkthumb
 
 checkthumb:
-	@if test "$(call cc-version)" -lt "0404"; then \
+	@if test "$(call cc-name)" = "gcc" -a \
+			"$(call cc-version)" -lt "0404"; then \
 		echo -n '*** Your GCC does not produce working '; \
 		echo 'binaries in THUMB mode.'; \
 		echo '*** Your board is configured for THUMB mode.'; \

arch/powerpc/config.mk

@@ -41,7 +41,8 @@ archprepare: checkgcc4
 # that U-Boot wants.
 # See http://lists.denx.de/pipermail/u-boot/2012-September/135156.html
 checkgcc4:
-	@if test $(call cc-version) -lt 0400; then \
+	@if test "$(call cc-name)" = "gcc" -a \
+			$(call cc-version) -lt 0400; then \
 		echo -n '*** Your GCC is too old, please upgrade to GCC 4.x or newer'; \
 		false; \
 	fi