Various fixes to base/binutils and base/gcc6.

- Add --with-sysroot=/ to CONFIGURE_ARGS.  base/binutils needs this so
  that ld honors --sysroot in linker scripts.  base/gcc6 needs this so
  that the C++ include paths honor --sysroot.
- Remove a hack from GCC's configure to force C++98 mode when building
  GCC with GCC.  libc++ assumes C++11, so this hack was breaking the
  build of base/gcc6 natively when the system compiler was GCC.
- Add toolchain makefiles installed to /usr/share/toolchains.

  These are suitable to be used by CROSS_TOOLCHAIN when doing a native
  arch build.  These makefiles enable appropriate knobs so that the
  in-tree components that are replaced by each package are not built
  or installed.  The freebsd-gcc toolchain makefile includes the
  binutils toolchain makefile if it is present.

Reviewed by:	bapt
Differential Revision:	https://reviews.freebsd.org/D22984

base/binutils/Makefile

@@ -3,6 +3,7 @@
 PORTNAME=	binutils
 PORTVERSION=	2.33.1
 PORTEPOCH=	0
+PORTREVISION=	1
 CATEGORIES=	base
 MASTER_SITES=	SOURCEWARE/binutils/releases
 PKGNAMEPREFIX=	${OPSYS:tl}-
@@ -35,6 +36,7 @@ CONFIGURE_ARGS+=	--disable-host-shared \
 			--disable-shared \
 			--disable-nls \
 			--with-system-zlib \
+			--with-sysroot="/" \
 			--enable-relro=no \
 			--enable-x86-relax-relocations=no \
 			--target=${BUTARGET}
@@ -117,5 +119,7 @@ post-install:
 	    ${STAGEDIR}${MANPREFIX}/man/man1/${tool}.1 \
 	    ${STAGEDIR}${PREFIX}/${BUTARGET}/bin/${tool}
 .endfor
+	@${MKDIR} ${STAGEDIR}${PREFIX}/share/toolchains
+	${INSTALL_DATA} ${.CURDIR}/files/freebsd-binutils.mk ${STAGEDIR}${PREFIX}/share/toolchains/
 
 .include <bsd.port.post.mk>

base/binutils/files/freebsd-binutils.mk

@@ -0,0 +1,4 @@
+CROSS_BINUTILS_PREFIX=/usr/bin/
+export WITH_PORT_BASE_BINUTILS=yes
+export WITHOUT_BINUTILS=yes
+export WITHOUT_LLD_IS_LD=yes

base/binutils/pkg-plist

@@ -561,3 +561,4 @@ bin/objdump
 share/man/man1/as.1.gz
 share/man/man1/ld.1.gz
 share/man/man1/objdump.1.gz
+share/toolchains/freebsd-binutils.mk

base/gcc6/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	gcc
 PORTVERSION=	6.5.0
+PORTREVISION=	1
 CATEGORIES=	base
 MASTER_SITES=	GCC/releases/gcc-${DISTVERSION} \
 		http://www.mpfr.org/mpfr-3.1.6/:mpfr \
@@ -32,6 +33,7 @@ CONFIGURE_ENV+= ${_tool}_FOR_TARGET="${${_tool}}"
 
 USES=	gmake libtool tar:xz makeinfo
 PLIST_SUB=	OPSYS=${OPSYS:tl} \
+		SUFFIX=${SUFFIX} \
 		GCC_TARGET=${GCC_TARGET} \
 		GCC_VERSION=${PORTVERSION}
 
@@ -47,6 +49,7 @@ CONFIGURE_ARGS+=	\
 		--disable-nls \
 		--without-headers \
 		--with-gxx-include-dir=/usr/include/c++/v1/ \
+		--with-sysroot="/" \
 		--with-build-sysroot=${CROSS_SYSROOT} \
 		-with-pkgversion="GNU Collection for FreeBSD"
 
@@ -119,5 +122,7 @@ post-install:
 .if ${ARCH} == "amd64" || ${ARCH} == "i386"
 	${RM} ${STAGEDIR}/usr/lib/gcc/${GCC_TARGET}/${PORTVERSION}/include/float.h
 .endif
+	@${MKDIR} ${STAGEDIR}${PREFIX}/share/toolchains
+	${INSTALL_DATA} ${FILESDIR}/freebsd-gcc.mk ${STAGEDIR}${PREFIX}/share/toolchains/freebsd-gcc${SUFFIX}.mk
 
 .include <bsd.port.post.mk>

base/gcc6/files/freebsd-gcc.mk

@@ -0,0 +1,8 @@
+XCC=/usr/bin/cc
+XCXX=/usr/bin/c++
+XCPP=/usr/bin/cpp
+X_COMPILER_TYPE=gcc
+export WITH_PORT_BASE_GCC=yes
+export WITHOUT_GCC=yes
+export WITHOUT_CLANG_IS_CC=yes
+.sinclude "freebsd-binutils.mk"

base/gcc6/files/patch-configure

@@ -1,6 +1,6 @@
---- configure.orig	2015-05-03 17:29:57 UTC
-+++ configure
-@@ -3675,10 +3675,6 @@ case "${target}" in
+--- configure.orig	2017-01-09 13:01:26.582656000 -0800
++++ configure	2019-03-26 14:29:44.995174000 -0700
+@@ -3717,10 +3717,6 @@ case "${target}" in
    *-*-dragonfly*)
      ;;
    *-*-freebsd*)
@@ -11,3 +11,16 @@
      ;;
    *-*-kaos*)
      # Remove unsupported stuff on all kaOS configurations.
+@@ -5450,12 +5446,6 @@ $as_echo "$as_me: WARNING: trying to bootstrap a cross
+     as_fn_error "invalid option for --enable-bootstrap" "$LINENO" 5
+     ;;
+ esac
+-
+-# When bootstrapping with GCC, build stage 1 in C++98 mode to ensure that a
+-# C++98 compiler can still start the bootstrap.
+-if test "$enable_bootstrap:$GXX" = "yes:yes"; then
+-  CXX="$CXX -std=gnu++98"
+-fi
+ 
+ # Used for setting $lt_cv_objdir
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for objdir" >&5

base/gcc6/pkg-plist

@@ -27,3 +27,4 @@ share/man/man1/gcov-tool.1.gz
 share/man/man7/fsf-funding.7.gz
 share/man/man7/gfdl.7.gz
 share/man/man7/gpl.7.gz
+share/toolchains/freebsd-gcc%%SUFFIX%%.mk