Per requests from the community, commit rudimentary cross compilation

support.  I've been building world with these changes for months w/o
ill effect.  I've also managed to build the cross tool chain for MIPS
with these patches.

Please note that the extent to which these patches work is largely
dictated by how well our tool chains support the cross compilation.
Building alpha binaries on i386 doesn't work.  Supposedly building
i386 binaries on alpha does work, but I've not verified it with these
patches, however.

Makefile.inc1

@@ -1,5 +1,5 @@
 #
-#	$Id: Makefile.inc1,v 1.77 1999/06/01 02:55:44 billf Exp $
+#	$Id: Makefile.inc1,v 1.78 1999/06/04 17:34:28 billf Exp $
 #
 # Make command line options:
 #	-DCLOBBER will remove /usr/include
@@ -135,6 +135,17 @@ MK_FLAGS=	-DWORLD -DNOINFO -DNOMAN         -DNOPROFILE
 MK_FLAGS=	-DWORLD -DNOINFO -DNOMAN -DNOPIC -DNOPROFILE -DNOSHARED
 .endif
 
+#
+# If we're building a cross world, define MACHINE and MACHINE_ARCH for
+# the version of make that we're using.
+#
+.if defined(TARGET)
+CROSS_MAKE_FLAGS+=-DMACHINE=\"${TARGET}\"
+.endif
+.if defined(TARGET_ARCH)
+CROSS_MAKE_FLAGS+=-DMACHINE_ARCH=\"${TARGET_ARCH}\"
+.endif
+
 #
 # Define the location of the temporary installation directory. Note that
 # MAKEOBJDIRPREFIX normally isn't defined so if the current directory is
@@ -187,9 +198,15 @@ COMPILER_ENV=	BISON_SIMPLE=${TOOLROOT}/usr/share/misc/bison.simple \
 		LD_LIBRARY_PATH=${TOOLROOT}${SHLIBDIR} \
 		LIBRARY_PATH=${WORLDTMP}${SHLIBDIR}:${WORLDTMP}/usr/lib
 
-BMAKEENV=	PATH=${TMPPATH} ${COMPILER_ENV} NOEXTRADEPEND=t \
+BMAKEENV=	${COMPILER_ENV} NOEXTRADEPEND=t PATH=${TMPPATH} \
 		OBJFORMAT_PATH=${TOOLROOT}/usr/libexec:/usr/libexec
-XMAKEENV=	PATH=${STRICTTMPPATH} ${COMPILER_ENV} \
+XTMAKEENV=	NOEXTRADEPEND=t
+.if defined(TARGET)
+XMAKEENV=	PATH=${TMPPATH}
+.else
+XMAKEENV=	PATH=${STRICTTMPPATH}
+.endif
+XMAKEENV+=	${COMPILER_ENV} \
 		PERL5LIB=${DESTDIR}/usr/libdata/perl/5.00503 \
 		OBJFORMAT_PATH=${TOOLROOT}/usr/libexec \
 		CFLAGS="-nostdinc ${CFLAGS}"	# XXX -nostdlib
@@ -199,6 +216,8 @@ MAKETMP=	${WORLDTMP}/make
 IBMAKE=	${BMAKEENV} MAKEOBJDIR=${MAKETMP} ${MAKE} DESTDIR=${WORLDTMP}
 
 .if	defined(NOTOOLS)
+# cross tools make
+XTMAKE=	${XTMAKEENV} ${MAKE} DESTDIR=${WORLDTMP}
 # bootstrap make
 BMAKE=	${BMAKEENV} ${MAKE} DESTDIR=${WORLDTMP}
 # cross make used for compilation
@@ -206,6 +225,8 @@ XMAKE=	${XMAKEENV} ${MAKE} DESTDIR=${WORLDTMP}
 # cross make used for final installation
 IXMAKE=	${XMAKEENV} ${MAKE}
 .else
+# cross tools make
+XTMAKE=	${XTMAKEENV} ${WORLDTMP}/usr/bin/make DESTDIR=${WORLDTMP}
 # bootstrap make
 BMAKE=	${BMAKEENV} ${WORLDTMP}/usr/bin/make DESTDIR=${WORLDTMP}
 # cross make used for compilation
@@ -239,7 +260,7 @@ buildworld: check-objformat
 	( \
 	cd ${.CURDIR}/usr.bin/make; \
 		MAKEOBJDIRPREFIX=""; unset MAKEOBJDIRPREFIX; \
-		${IBMAKE} -I${.CURDIR}/share/mk ${MK_FLAGS} all; \
+		${IBMAKE} -I${.CURDIR}/share/mk ${MK_FLAGS} all CROSS_MAKE_FLAGS='${CROSS_MAKE_FLAGS}'; \
 		${IBMAKE} -I${.CURDIR}/share/mk ${MK_FLAGS} install; \
 		${IBMAKE} -I${.CURDIR}/share/mk ${MK_FLAGS} clean \
 	)
@@ -274,7 +295,14 @@ buildworld: check-objformat
 	@echo ">>> Rebuilding the ${OBJFORMAT} obj tree"
 	@echo "--------------------------------------------------------------"
 	cd ${.CURDIR}; ${BMAKE} -f Makefile.inc1 par-${OBJDIR}
-.if !defined(NOTOOLS)
+.if defined(TARGET)
+	@echo
+	@echo "--------------------------------------------------------------"
+	@echo ">>> Rebuilding toolchain for ${TARGET} buildworld"
+	@echo "--------------------------------------------------------------"
+	cd ${.CURDIR}; ${XTMAKE} -f Makefile.inc1 cross-toolchain
+.endif
+.if !defined(NOTOOLS) && !defined(TARGET)
 	@echo
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Rebuilding ${OBJFORMAT} bootstrap tools"
@@ -302,8 +330,6 @@ buildworld: check-objformat
 	@echo ">>> Rebuilding tools needed to build libraries"
 	@echo "--------------------------------------------------------------"
 	cd ${.CURDIR}; ${BMAKE} -f Makefile.inc1 lib-tools
-.endif
-.if !defined(NOTOOLS)
 	@echo
 	@echo "--------------------------------------------------------------"
 	@echo ">>> Rebuilding all other tools needed to build the ${OBJFORMAT} world"
@@ -475,8 +501,14 @@ hierarchy:
 # for the dependency information to be gathered from.
 #
 bootstrap:
+.if defined(DESTDIR)
+	rm -f ${DESTDIR}/usr/src/sys
+	ln -s ${.CURDIR}/sys ${DESTDIR}/usr/src
+	cd ${.CURDIR}/include;	${MAKE} all
+	cd ${.CURDIR}/include;	${MAKE} beforeinstall
+.endif
 	cd ${.CURDIR}/usr.bin/make; ${MAKE} ${MK_FLAGS} ${_DEPEND}; \
-		${MAKE} ${MK_FLAGS} all; \
+		${MAKE} ${MK_FLAGS} all CROSS_MAKE_FLAGS='${CROSS_MAKE_FLAGS}'; \
 		${MAKE} ${MK_FLAGS} -B install ${CLEANDIR} ${OBJDIR}
 	cd ${.CURDIR}/usr.bin/xinstall; ${MAKE} ${MK_FLAGS} ${_DEPEND}; \
 		${MAKE} ${MK_FLAGS} all; \
@@ -492,6 +524,9 @@ bootstrap:
 	cd ${.CURDIR}/usr.sbin/mtree; ${MAKE} ${MK_FLAGS} ${_DEPEND}; \
 		${MAKE} ${MK_FLAGS} all; \
 		${MAKE} ${MK_FLAGS} -B install ${CLEANDIR} ${OBJDIR}
+.if defined(DESTDIR)
+	cd ${.CURDIR}/include && ${MAKE} copies
+.endif
 
 #
 # include-tools - generally the same as 'bootstrap', except that it's for
@@ -966,6 +1001,24 @@ check-objformat	:
 	@exit 1
 .endif
 
+#
+# cross toolchain
+#
+# This is a subset of the tools built in lib-tools, build-tools, etc.  What
+# we are looking for here is to build the cross compilers, etc, with
+# the current host compiler.
+#
+cross-toolchain:
+.for d in				\
+		gnu/usr.bin/binutils	\
+		gnu/usr.bin/bison	\
+		gnu/usr.bin/cc		\
+		usr.bin/objformat
+	cd ${.CURDIR}/$d; ${MAKE} ${MK_FLAGS} ${_DEPEND}; \
+		${XTMAKE} ${MK_FLAGS} all; \
+		${XTMAKE} ${MK_FLAGS} -B install; \
+		${XTMAKE} ${MK_FLAGS:S/-DNOPIC//} -B ${CLEANDIR} ${OBJDIR}
+.endfor
 
 .for __target in clean cleandepend cleandir depend obj
 .for entry in ${SUBDIR}

usr.bin/make/Makefile

@@ -1,8 +1,8 @@
 #	@(#)Makefile	5.2 (Berkeley) 12/28/90
-#	$Id$
+#	$Id: Makefile,v 1.10 1997/02/22 19:27:05 peter Exp $
 
 PROG=	make
-CFLAGS+= -I${.CURDIR}
+CFLAGS+= -I${.CURDIR} ${CROSS_MAKE_FLAGS}
 SRCS=	arch.c buf.c compat.c cond.c dir.c for.c hash.c job.c main.c \
 	make.c parse.c str.c suff.c targ.c var.c util.c
 SRCS+=	lstAppend.c lstAtEnd.c lstAtFront.c lstClose.c lstConcat.c \