Hook clang into the build on i386/amd64/powerpc.

Approved by:	ed (mentor)

Makefile.inc1

@@ -956,6 +956,13 @@ _gensnmptree=	usr.sbin/bsnmpd/gensnmptree
 _crunchgen=	usr.sbin/crunch/crunchgen
 .endif
 
+# XXX: There is no way to specify bootstrap tools depending on MK-flags
+# with different per-architecture default values. Always build tblgen.
+_clang_tblgen= \
+	lib/clang/libllvmsupport \
+	lib/clang/libllvmsystem \
+	usr.bin/clang/tblgen
+
 .if ${MK_CDDL} != "no"
 _dtrace_tools= cddl/usr.bin/sgsmsg cddl/lib/libctf lib/libelf \
     lib/libdwarf cddl/usr.bin/ctfconvert cddl/usr.bin/ctfmerge
@@ -963,6 +970,7 @@ _dtrace_tools= cddl/usr.bin/sgsmsg cddl/lib/libctf lib/libelf \
 
 bootstrap-tools:
 .for _tool in \
+    ${_clang_tblgen} \
     ${_dtrace_tools} \
     ${_strfile} \
     ${_gperf} \

etc/mtree/BSD.include.dist

@@ -83,6 +83,10 @@
         scsi
         ..
     ..
+    clang
+        2.0
+        ..
+    ..
     crypto
     ..
     dev

lib/Makefile

@@ -108,7 +108,8 @@ SUBDIR=	${SUBDIR_ORDERED} \
 	libwrap \
 	liby \
 	libz \
-	${_bind}
+	${_bind} \
+	${_clang}
 
 .if exists(${.CURDIR}/csu/${MACHINE_ARCH}-elf)
 _csu=csu/${MACHINE_ARCH}-elf
@@ -137,6 +138,10 @@ _libsdp=	libsdp
 _libbsnmp=	libbsnmp
 .endif
 
+.if ${MK_CLANG} != "no"
+_clang=		clang
+.endif
+
 .if ${MK_GPIB} != "no"
 _libgpib=	libgpib
 .endif

share/mk/bsd.own.mk

@@ -287,6 +287,18 @@ _no_fdt= FDT
 _no_fdt= FDT
 .endif
 
+#
+# Default behaviour of MK_CLANG depends on the architecture.
+#
+.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386" || \
+    ${MACHINE_ARCH} == "powerpc"
+_clang_yes=CLANG
+_clang_no=
+.else
+_clang_yes=
+_clang_no=CLANG
+.endif
+
 #
 # MK_* options which default to "yes".
 #
@@ -314,6 +326,7 @@ _no_fdt= FDT
     BZIP2 \
     CALENDAR \
     CDDL \
+    ${_clang_yes} \
     CPP \
     CRYPT \
     CTM \
@@ -417,6 +430,7 @@ MK_${var}:=	yes
     BIND_LIBS \
     BIND_SIGCHASE \
     BIND_XML \
+    ${_clang_no} \
     ${_no_fdt} \
     HESIOD \
     IDEA
@@ -497,6 +511,7 @@ MK_GROFF:=	no
 .endif
 
 .if ${MK_TOOLCHAIN} == "no"
+MK_CLANG:=	no
 MK_GDB:=	no
 .endif
 

usr.bin/Makefile

@@ -35,6 +35,7 @@ SUBDIR=	alias \
 	${_chkey} \
 	chpass \
 	cksum \
+	${_clang} \
 	cmp \
 	col \
 	${_colcrt} \
@@ -279,6 +280,10 @@ _cpio=		cpio
 _calendar=	calendar
 .endif
 
+.if ${MK_CLANG} != "no"
+_clang=		clang
+.endif
+
 .if ${MK_HESIOD} != "no"
 _hesinfo=	hesinfo
 .endif