Obviate the need to set the COMPILER_PATH and LIBRARY_PATH in Makefile.inc1

to pick up the correct cross-tools (the compiler executables and binutils)
and special linker files (crt*.o).  This is now controlled by a single knob,
TOOLS_PREFIX, when building cross-tools.

Fixed regression in Makefile.inc1,v 1.203 (-nostdinc).  This clobbered target
architecture's CFLAGS with building host's CPUTYPE setting in /etc/make.conf,
and had a nice but nasty side effect of exposing some (normally hidden) bugs
in system headers.

(Attempt to move the "-nostdinc -I..." part of CFLAGS into the new CINCLUDES
(modeled after a similar CXXINCLUDES) eventually failed because hard-coding
${WORLDTMP}/usr/include to be the first in the include list does not always
work, e.g. lib/libbind.)

Compensate the -nostdinc removal by making cpp(1) built in the cross-tools
stage to not look for <> header files in the building host's /usr/include
(already committed as gnu/usr.bin/cc/cc_tools/freebsd-native.h, revisions
1.10-1.12, STANDARD_INCLUDE_DIR).

: $ /usr/obj/usr/src/i386/usr/bin/cpp -v /dev/null
:
: Before:
:
: #include <...> search starts here:
:  /usr/obj/usr/src/i386/usr/include
:  /usr/include
: End of search list.
:
: After:
:
: #include <...> search starts here:
:  /usr/obj/usr/src/i386/usr/include
:  /usr/obj/usr/src/i386/usr/include

(Disabling the use of GCC_INCLUDE_DIR in the FREEBSD_NATIVE case would fix
the duplicate above.)

Get rid of the (now unneeded) -I${DESTDIR}/usr/include magic in bsd.prog.mk
and bsd.lib.mk.  Finish the removal of LDDESTDIR in bsd.lib.mk,v 1.55 -- we
no longer have users of it.

The required changes to gcc were already committed as contrib/gcc.295/gcc.c,
revisions 1.23 and 1.24.

Basically, this allows for the changes above plus makes gcc(1) persistent
about path configuration, whether it's configured as a native or a cross
compiler:

: $ /usr/obj/usr/src/i386/usr/bin/cc -print-search-dirs
: install: /usr/obj/usr/src/i386/usr/libexec/(null)
: programs: /usr/obj/usr/src/i386/usr/libexec/elf/:/usr/obj/usr/src/i386/usr/libexec/
: libraries: /usr/obj/usr/src/i386/usr/lib/
:
: $ /usr/obj/alpha/usr/src/i386/usr/bin/cc -print-search-dirs
: install: /usr/obj/alpha/usr/src/i386/usr/libexec/(null)
: programs: /usr/obj/alpha/usr/src/i386/usr/libexec/elf/:/usr/obj/alpha/usr/src/i386/usr/libexec/
: libraries: /usr/obj/alpha/usr/src/i386/usr/lib/

Reviewed by:	bde, obrien

Makefile.inc1

@@ -167,11 +167,7 @@ INSTALLTMP!=	/usr/bin/mktemp -d -u -t install
 CROSSENV=	MAKEOBJDIRPREFIX=${OBJTREE} \
 		MACHINE_ARCH=${TARGET_ARCH} \
 		MACHINE=${TARGET} \
-		COMPILER_PATH=${WORLDTMP}/usr/libexec:${WORLDTMP}/usr/bin \
-		LIBRARY_PATH=${WORLDTMP}${SHLIBDIR}:${WORLDTMP}/usr/lib \
 		OBJFORMAT_PATH=${WORLDTMP}/usr/libexec \
-		CFLAGS="-nostdinc ${CFLAGS}" \
-		CXXINCLUDES="-nostdinc++ ${CXXINCLUDES}" \
 		PERL5LIB=${WORLDTMP}/usr/libdata/perl/5.6.0 \
 		GROFF_BIN_PATH=${WORLDTMP}/usr/bin \
 		GROFF_FONT_PATH=${WORLDTMP}/usr/share/groff_font \

share/mk/bsd.lib.mk

@@ -37,11 +37,6 @@ SHLIB_NAME?=	lib${LIB}.so.${SHLIB_MAJOR}.${SHLIB_MINOR}
 .endif
 .endif
 
-.if defined(DESTDIR) && !defined(BOOTSTRAPPING)
-CFLAGS+= -I${DESTDIR}/usr/include
-CXXINCLUDES+= -I${DESTDIR}/usr/include/g++
-.endif
-
 .if defined(DEBUG_FLAGS)
 CFLAGS+= ${DEBUG_FLAGS}
 .endif
@@ -196,10 +191,6 @@ lib${LIB}_p.a:: ${POBJS}
 	${RANLIB} lib${LIB}_p.a
 .endif
 
-.if defined(DESTDIR) && !defined(BOOTSTRAPPING)
-LDDESTDIRENV?=	LIBRARY_PATH=${DESTDIR}${SHLIBDIR}:${DESTDIR}${LIBDIR}
-.endif
-
 SOBJS+= ${OBJS:.o=.So}
 
 .if defined(SHLIB_NAME)
@@ -210,13 +201,13 @@ ${SHLIB_NAME}: ${SOBJS}
 	@ln -sf ${SHLIB_NAME} ${SHLIB_LINK}
 .endif
 .if ${OBJFORMAT} == aout
-	@${LDDESTDIRENV} ${CC} -shared -Wl,-x,-assert,pure-text \
+	@${CC} -shared -Wl,-x,-assert,pure-text \
 	    -o ${SHLIB_NAME} \
-	    `lorder ${SOBJS} | tsort -q` ${LDDESTDIR} ${LDADD}
+	    `lorder ${SOBJS} | tsort -q` ${LDADD}
 .else
-	@${LDDESTDIRENV} ${CC} -shared -Wl,-x \
+	@${CC} -shared -Wl,-x \
 	    -o ${SHLIB_NAME} -Wl,-soname,${SONAME} \
-	    `lorder ${SOBJS} | tsort -q` ${LDDESTDIR} ${LDADD}
+	    `lorder ${SOBJS} | tsort -q` ${LDADD}
 .endif
 .endif
 
@@ -252,7 +243,7 @@ _EXTRADEPEND:
 .if !defined(NOEXTRADEPEND) && defined(SHLIB_NAME)
 .if ${OBJFORMAT} == aout
 	echo ${SHLIB_NAME}: \
-	    `${LDDESTDIRENV} ${CC} -shared -Wl,-f ${LDDESTDIR} ${LDADD}` \
+	    `${CC} -shared -Wl,-f ${LDADD}` \
 	    >> ${DEPENDFILE}
 .else
 .if defined(DPADD) && !empty(DPADD)

share/mk/bsd.prog.mk

@@ -11,10 +11,6 @@ __initialized__:
 .SUFFIXES: .out .o .c .cc .cpp .cxx .C .m .y .l .s .S
 
 CFLAGS+=${COPTS} ${DEBUG_FLAGS}
-.if defined(DESTDIR) && !defined(BOOTSTRAPPING)
-CFLAGS+= -I${DESTDIR}/usr/include
-CXXINCLUDES+= -I${DESTDIR}/usr/include/g++
-.endif
 
 .if !defined(DEBUG_FLAGS)
 STRIP?=	-s