On amd64 we can now build the bootstrap with clang if we
* skip the integrated assembler for assym.h;
* use as(1) to build biosboot.S and the various versions of srt0.S.
I successfully tested a clang-built pxeboot(8) and boot(8).
Index: Makefile.inc
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/Makefile.inc,v
retrieving revision 1.16
diff -u -p -r1.16 Makefile.inc
--- Makefile.inc 30 May 2017 15:02:22 -0000 1.16
+++ Makefile.inc 30 May 2017 15:28:46 -0000
@@ -23,13 +23,18 @@ CLEANFILES+= assym.h machine
SACFLAGS+=-nostdinc -fno-builtin -fpack-struct
+.include <bsd.own.mk>
+.if ${COMPILER_VERSION:Mclang}
+NO_INTEGR_AS= -no-integrated-as
+.endif
+
.if !make(clean) && !make(cleandir) && !make(includes) && !make(libdep) && \
!make(sadep) && !make(salibdir) && !make(obj)
.BEGIN:
@([ X$(S) = X -o -h machine ] || ln -s $(S)/arch/amd64/include machine)
assym.h: ${S}/kern/genassym.sh ${SADIR}/etc/genassym.cf
- sh ${S}/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} \
+ sh ${S}/kern/genassym.sh ${CC} ${NO_INTEGR_AS} ${CFLAGS} ${CPPFLAGS} \
${PARAM} < ${SADIR}/etc/genassym.cf > assym.h.tmp && \
mv -f assym.h.tmp assym.h
.endif
Index: biosboot/Makefile
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/biosboot/Makefile,v
retrieving revision 1.11
diff -u -p -r1.11 Makefile
--- biosboot/Makefile 30 Jul 2016 03:25:48 -0000 1.11
+++ biosboot/Makefile 30 May 2017 15:12:20 -0000
@@ -23,6 +23,7 @@ ${PROG}: $(OBJS)
CPPFLAGS+=-DLOADADDR=$(LOADADDR) -DLINKADDR=$(LINKADDR)
-DBOOTMAGIC=$(BOOTMAGIC)
CPPFLAGS+=${DEBUGFLAGS}
CFLAGS+=-fno-pie
+AFLAGS+=${NO_INTEGR_AS}
AFLAGS+=-m32 # -Wa,-a
AFLAGS+=-fno-pie
.else
Index: boot/Makefile
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/boot/Makefile,v
retrieving revision 1.36
diff -u -p -r1.36 Makefile
--- boot/Makefile 18 Sep 2016 16:34:59 -0000 1.36
+++ boot/Makefile 30 May 2017 15:12:44 -0000
@@ -77,6 +77,7 @@ CPPFLAGS+=-DBOOTMAGIC=$(BOOTMAGIC) ${DEB
CPPFLAGS+=-DSLOW -DSMALL -DNOBYFOUR -DNO_GZIP -DDYNAMIC_CRC_TABLE
CPPFLAGS+=-DHEAP_LIMIT=${HEAP_LIMIT} -I${S}/stand/boot #-DCOMPAT_UFS
CFLAGS+=-m32 $(SACFLAGS) -D__INTERNAL_LIBSA_CREAD -fno-pie
+AFLAGS+=${NO_INTEGR_AS}
AFLAGS+=-m32 # -Wa,-R
# AFLAGS+=-Wa,-a
AFLAGS+=-fno-pie
Index: cdboot/Makefile
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/cdboot/Makefile,v
retrieving revision 1.32
diff -u -p -r1.32 Makefile
--- cdboot/Makefile 18 Sep 2016 16:34:59 -0000 1.32
+++ cdboot/Makefile 30 May 2017 15:12:55 -0000
@@ -68,5 +68,6 @@ CFLAGS+=${SACFLAGS} -D__INTERNAL_LIBSA_C
CFLAGS+=-DOSREV=\"${OSREV}\" -DMACHINE=\"${MACHINE}\"
CFLAGS+=-DKERNEL=\"/${OSREV}/${MACHINE}/bsd.rd\"
CFLAGS+=-fno-pie
+AFLAGS+=${NO_INTEGR_AS}
AFLAGS+=-m32
AFLAGS+=-fno-pie
Index: pxeboot/Makefile
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/pxeboot/Makefile,v
retrieving revision 1.30
diff -u -p -r1.30 Makefile
--- pxeboot/Makefile 18 Sep 2016 16:34:59 -0000 1.30
+++ pxeboot/Makefile 30 May 2017 15:13:00 -0000
@@ -70,6 +70,7 @@ CPPFLAGS+=-DSLOW -DSMALL -DNOBYFOUR -DNO
CPPFLAGS+=-DHEAP_LIMIT=${HEAP_LIMIT} -I${S}/stand/boot #-DCOMPAT_UFS
CFLAGS+=-m32
CFLAGS+=$(SACFLAGS) -D__INTERNAL_LIBSA_CREAD -fno-pie
+AFLAGS+=${NO_INTEGR_AS}
# AFLAGS+=-Wa,-a
AFLAGS+=-m32 # -Wa,-R
AFLAGS+=-fno-pie
--
Christian "naddy" Weisgerber na...@mips.inka.de
