freebsd64.h: Add bits for 32-bit multilib support.

2019-04-25  Andreas Tobler  <andreast@gcc.gnu.org>

        * config/i386/freebsd64.h: Add bits for 32-bit multilib support.
        * config/i386/t-freebsd64: New file.
        * config.gcc: Add the t-freebsd64 for multilib support.

From-SVN: r270586

gcc/ChangeLog

+2019-04-25  Andreas Tobler  <andreast@gcc.gnu.org>
+
+	* config/i386/freebsd64.h: Add bits for 32-bit multilib support.
+	* config/i386/t-freebsd64: New file.
+	* config.gcc: Add the t-freebsd64 for multilib support.
+
 2019-04-25  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* doc/extend.texi (vector_size): Add missing comma after @xref.

gcc/config.gcc

@@ -4927,7 +4927,10 @@ case ${target} in
 		;;
 	i[34567]86-*-dragonfly* | x86_64-*-dragonfly*)
 		;;
-	i[34567]86-*-freebsd* | x86_64-*-freebsd*)
+	i[34567]86-*-freebsd*)
+		;;
+	x86_64-*-freebsd*)
+		tmake_file="${tmake_file} i386/t-freebsd64"
 		;;
 	ia64*-*-linux*)
 		;;

gcc/config/i386/freebsd64.h

@@ -31,7 +31,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #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 @@ along with GCC; see the file COPYING3.  If not see
 	-dynamic-linker %(fbsd_dynamic_linker) } \
     %{static:-Bstatic}} \
   %{symbolic:-Bsymbolic}"
+
+#undef	MULTILIB_DEFAULTS
+#define MULTILIB_DEFAULTS { "m64" }

gcc/config/i386/t-freebsd64

+# 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