Merge the clang support from i386. Don't move to clang yet.

svn path=/head/; revision=268474

sys/boot/pc98/boot2/Makefile

@@ -26,10 +26,7 @@ BOOT2_UFS?=	UFS1_AND_UFS2
 #BOOT2_UFS?=	UFS1_ONLY
 
 CFLAGS=	-Os \
-	-fno-guess-branch-probability \
 	-fomit-frame-pointer \
-	-fno-unit-at-a-time \
-	-mno-align-long-strings \
 	-mrtd \
 	-mregparm=3 \
 	-D${BOOT2_UFS} \
@@ -46,7 +43,10 @@ CFLAGS=	-Os \
 	-Wpointer-arith -Wshadow -Wstrict-prototypes -Wwrite-strings \
 	-Winline
 
-CFLAGS.gcc+=	--param max-inline-insns-single=100
+CFLAGS.gcc+=	-fno-guess-branch-probability \
+		-fno-unit-at-a-time \
+		-mno-align-long-strings \
+		--param max-inline-insns-single=100
 
 # Set machine type to PC98_SYSTEM_PARAMETER
 #CFLAGS+=	-DSET_MACHINE_TYPE
@@ -54,6 +54,8 @@ CFLAGS.gcc+=	--param max-inline-insns-single=100
 # Initialize the bi_bios_geom using the BIOS geometry
 #CFLAGS+=	-DGET_BIOSGEOM
 
+CFLAGS.clang+=${CLANG_OPT_SMALL}
+
 LD_FLAGS=-static -N --gc-sections
 
 # Pick up ../Makefile.inc early.
@@ -112,3 +114,6 @@ boot2.h: boot1.out
 	    REL1=`printf "%d" ${REL1}` > ${.TARGET}
 
 .include <bsd.prog.mk>
+
+# XXX: clang integrated-as doesn't grok .codeNN directives yet
+CFLAGS+=		${CLANG_NO_IAS}