Commit a workaround for archs with no clang in base. This avoids

the warning '"clang --version" returned non-zero status' when doing
operations such as 'make describe'.

I have been running with this patch on sparc64 for quite some time.
It has also been tested on powerpc64, and for harmlessness on amd64.

Arguably, this is a something missing in the infrastructure.

Approved by:	portmgr (tier-2 blanket)

www/mod_spdy/Makefile

@@ -46,15 +46,26 @@ SUB_LIST+=	APACHEMODDIR=${APACHEMODDIR}
 
 OPTIONS_DEFINE=	GCC DEBUG
 
+# workaround for archs with no clang in base, part 1:
+# do not include the option to turn GCC off.  Instead, force its use.
+OPTIONS_EXCLUDE_sparc64=	GCC
+
 .include <bsd.port.options.mk>
 
-.if ${PORT_OPTIONS:MGCC}
+# workaround for archs with no clang in base, part 2
+.if ${PORT_OPTIONS:MGCC} || ${ARCH} == sparc64
+FORCE_GCC=	yes
+.else
+FORCE_GCC=	no
+.endif
+
+.if ${FORCE_GCC} == yes
 BUILD_DEPENDS+=	${LOCALBASE}/bin/as:devel/binutils
 CONFIGURE_ENV+=	COMPILER_PATH=${LOCALBASE}/bin
 MAKE_ENV+=	COMPILER_PATH=${LOCALBASE}/bin
 .endif
 
-.if ${PORT_OPTIONS:MGCC}
+.if ${FORCE_GCC} == yes
 USE_GCC?=	yes
 GYP_DEFINES+=	gcc_version=${CXX:S/g++//}
 .else
@@ -103,7 +114,7 @@ post-patch:
 		-e 's,%%FILESDIR%%,${FILESDIR},g' \
 			-e 's,%%OPENSSLBASE%%,${OPENSSLBASE},g' \
 			${WRKSRC}/build_modssl_with_npn.sh
-.if ${PORT_OPTIONS:MGCC}
+.if ${FORCE_GCC} == yes
 	@${REINPLACE_CMD} -e 's,%%GCCCXXFLAGS%%,-I${LOCALBASE}/lib/gcc${CXX:S/g++//}/include,g' \
 		-e 's,%%GCCLDFLAGS%%,-L${LOCALBASE}/lib/gcc${CXX:S/g++//},g' \
 			${WRKSRC}/Makefile