This commit brings multilib support for gcc on amd64. This means you can

compile and execute 32-bit binaries with gcc.
The gcc part will be upstreamed as soon as gcc trunk opens for new commits.
On the release front, gcc8, we will merge this commit after a week or so.

Approved by:	gerald@

2 files changed, 76 insertions, 1 deletions

diff --git a/lang/gcc9-devel/Makefile b/lang/gcc9-devel/Makefile
index 711e9182f248..fdf08f981961 100644
--- a/lang/gcc9-devel/Makefile
+++ b/lang/gcc9-devel/Makefile
@@ -49,6 +49,8 @@ BOOTSTRAP_DESC=		Build using a full bootstrap
 GRAPHITE_DESC=		Support for Graphite loop optimizations
 
 .if exists(/usr/lib32/libc.so)
+OPTIONS_DEFINE_amd64+=		MULTILIB
+OPTIONS_DEFAULT_amd64+=	MULTILIB
 OPTIONS_DEFINE_powerpc64+=	MULTILIB
 OPTIONS_DEFAULT_powerpc64+=	MULTILIB
 MULTILIB_DESC=		Build support for 32-bit and 64-bit targets
@@ -140,7 +142,7 @@ post-stage:
 	# Add target libraries and include files to packaging list.
 	${RM} ${WRKDIR}/PLIST.lib
 
-.if ${ARCH} == powerpc64 && ${PORT_OPTIONS:MMULTILIB}
+.if (${ARCH} == amd64 || ${ARCH} == powerpc64) && ${PORT_OPTIONS:MMULTILIB}
 	${MKDIR} ${STAGEDIR}${TARGLIB32}
 	${MV} ${STAGEDIR}${PREFIX}/lib/lib32 ${STAGEDIR}${TARGLIB32}/gcc${SUFFIX}
 .endif
diff --git a/lang/gcc9-devel/files/patch-amd64-gcc-multilib-support b/lang/gcc9-devel/files/patch-amd64-gcc-multilib-support
new file mode 100644
index 000000000000..ffae93210614
--- /dev/null
+++ b/lang/gcc9-devel/files/patch-amd64-gcc-multilib-support
@@ -0,0 +1,73 @@
+--- UTC
+Index: gcc/config.gcc
+===================================================================
+--- gcc/config.gcc	(revision 269726)
++++ gcc/config.gcc	(working copy)
+@@ -4925,8 +4925,11 @@
+ 		;;
+ 	i[34567]86-*-dragonfly* | x86_64-*-dragonfly*)
+ 		;;
+-	i[34567]86-*-freebsd* | x86_64-*-freebsd*)
++	i[34567]86-*-freebsd*)
+ 		;;
++	x86_64-*-freebsd*)
++		tmake_file="${tmake_file} i386/t-freebsd64"
++		;;
+ 	ia64*-*-linux*)
+ 		;;
+ 
+Index: gcc/config/i386/freebsd64.h
+===================================================================
+--- gcc/config/i386/freebsd64.h	(revision 269733)
++++ gcc/config/i386/freebsd64.h	(working copy)
+@@ -31,7 +31,7 @@
+ 
+ #undef	LINK_SPEC
+ #define LINK_SPEC "\
+-  %{m32:-m elf_i386_fbsd} \
++  %{m32:-m elf_i386_fbsd}%{!m32:-m elf_x86_64_fbsd} \
+   %{p:%nconsider using '-pg' instead of '-p' with gprof(1)} \
+   %{v:-V} \
+   %{assert*} %{R*} %{rpath*} %{defsym*} \
+@@ -42,3 +42,6 @@
+ 	-dynamic-linker %(fbsd_dynamic_linker) } \
+     %{static:-Bstatic}} \
+   %{symbolic:-Bsymbolic}"
++
++#undef	MULTILIB_DEFAULTS
++#define MULTILIB_DEFAULTS { "m64" }
+Index: gcc/config/i386/t-freebsd64
+===================================================================
+--- gcc/config/i386/t-freebsd64	(nonexistent)
++++ gcc/config/i386/t-freebsd64	(working copy)
+@@ -0,0 +1,30 @@
++# Copyright (C) 2019 Free Software Foundation, Inc.
++#
++# This file is part of GCC.
++#
++# GCC is free software; you can redistribute it and/or modify
++# it under the terms of the GNU General Public License as published by
++# the Free Software Foundation; either version 3, or (at your option)
++# any later version.
++#
++# GCC is distributed in the hope that it will be useful,
++# but WITHOUT ANY WARRANTY; without even the implied warranty of
++# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++# GNU General Public License for more details.
++#
++# You should have received a copy of the GNU General Public License
++# along with GCC; see the file COPYING3.  If not see
++# <http://www.gnu.org/licenses/>.
++
++# The 32-bit libraries are found in /usr/lib32
++
++# To support i386 and x86-64, the directory structrue
++# should be:
++#
++# 	/lib has x86-64 libraries.
++# 	/lib32 has i386 libraries.
++#
++
++MULTILIB_OPTIONS    = m32
++MULTILIB_DIRNAMES   = 32
++MULTILIB_OSDIRNAMES = ../lib32