Unbreak Clang on PowerPC.

It seems GCC 4.2.1 on PowerPC miscompiles Clang, causing it to crash
when building even simple Hello World applications. Switch back to -O1
for this architecture.

Submitted by:	nwhitehorn

lib/clang/clang.build.mk

@@ -8,11 +8,16 @@ CFLAGS+=-I${LLVM_SRCS}/include -I${CLANG_SRCS}/include \
 	-DLLVM_ON_UNIX -DLLVM_ON_FREEBSD \
 	-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS #-DNDEBUG
 
+# Correct for gcc miscompilation when compiling on PPC with -O2
+.if ${MACHINE_ARCH} == "powerpc"
+CFLAGS+= -O1
+.endif
+
 TARGET_ARCH?=	${MACHINE_ARCH}
 # XXX: 8.0, to keep __FreeBSD_cc_version happy
 CFLAGS+=-DLLVM_HOSTTRIPLE=\"${TARGET_ARCH}-undermydesk-freebsd9.0\" \
 	-DCLANG_VENDOR=\"FreeBSD\ \" -DSVN_REVISION=\"104832\" \
-	-DCLANG_VENDOR_SUFFIX=\"\ 20100613\"
+	-DCLANG_VENDOR_SUFFIX=\"\ 20100614\"
 
 .PATH:	${LLVM_SRCS}/${SRCDIR}