[patch, mips] New mips triplet for multilib linux builds

["Steve Ellcey " <sellcey at mips dot com>]

I would like to create a new mips target triplet (mips-mti-linux-gnu).
This target would be multilib by default and would have --enable-synci
on by default.  It would mainly be used for building mips cross compilers
with glibc.  I hope to extend this target to support the n32 and 64 bit
ABIs in the future and add a corresponding mips-mti-elf triplet that would
be like mips-sde-elf but have fewer/different multilib versions.

Other then adding the new target the only changes are to the --enable-synci
default setting (enabled for mips-mti-linux-gnu, still disabled for other
targets) and in mips.h to use a new macro SYNCI_SPEC so that I don't have
to copy all of OPTION_DEFAULT_SPECS into mti-linux.h just to change the
-msynci handling.

I tested the changes by building and running the testsuite with the qemu
simulator.  No glibc or binutils changes were needed for this.

OK to checkin?

Steve Ellcey
sellcey@mips.com


2012-09-04  Steve Ellcey  <sellcey@mips.com>

	* config.gcc: Add mips*-mti-linux* target and make with_synci
	true by default for that target.
	* config/mips/mips.h (SYNCI_SPEC): New.
	(OPTION_DEFAULT_SPECS): Use new SYNCI_SPEC.
	* mti-linux.h: New file.
	* t-mti-linux: New file.


diff --git a/gcc/config.gcc b/gcc/config.gcc
index 9ec8a41..6923211 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1685,6 +1685,13 @@ mips*-*-netbsd*)			# NetBSD/mips, either endian.
 	tm_file="elfos.h ${tm_file} mips/elf.h netbsd.h netbsd-elf.h mips/netbsd.h"
 	extra_options="${extra_options} netbsd.opt netbsd-elf.opt"
 	;;
+mips*-mti-linux*)
+	tm_file="dbxelf.h elfos.h gnu-user.h linux.h glibc-stdint.h mips/mti-linux.h ${tm_file} mips/gnu-user.h mips/gnu-user64.h mips/linux64.h mips/linux-common.h"
+	tmake_file="${tmake_file} mips/t-mti-linux"
+	gnu_ld=yes
+	gas=yes
+	test x$with_llsc != x || with_llsc=yes
+	;;
 mips64*-*-linux* | mipsisa64*-*-linux*)
 	tm_file="dbxelf.h elfos.h gnu-user.h linux.h glibc-stdint.h ${tm_file} mips/gnu-user.h mips/gnu-user64.h mips/linux64.h mips/linux-common.h"
 	tmake_file="${tmake_file} mips/t-linux64"
@@ -3262,10 +3269,19 @@ case "${target}" in
 		yes)
 			with_synci=synci
 			;;
-		"" | no)
-			# No is the default.
+		no)
 			with_synci=no-synci
 			;;
+		"")
+			case "${target}" in
+				mips*-mti-*)
+					with_synci=synci
+					;;
+				*)
+					with_synci=no-synci
+					;;
+			esac
+			;;
 		*)
 			echo "Unknown synci type used in --with-synci" 1>&2
 			exit 1
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index 9ce466d..b98b434 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -748,6 +748,9 @@ struct mips_cpu_info {
      specified.
    --with-divide is ignored if -mdivide-traps or -mdivide-breaks are
      specified. */
+#ifndef SYNCI_SPEC
+#define SYNCI_SPEC "-m%(VALUE)"
+#endif
 #define OPTION_DEFAULT_SPECS \
   {"arch", "%{" MIPS_ARCH_OPTION_SPEC ":;: -march=%(VALUE)}" }, \
   {"arch_32", "%{" OPT_ARCH32 ":%{" MIPS_ARCH_OPTION_SPEC ":;: -march=%(VALUE)}}" }, \
@@ -760,7 +763,7 @@ struct mips_cpu_info {
   {"divide", "%{!mdivide-traps:%{!mdivide-breaks:-mdivide-%(VALUE)}}" }, \
   {"llsc", "%{!mllsc:%{!mno-llsc:-m%(VALUE)}}" }, \
   {"mips-plt", "%{!mplt:%{!mno-plt:-m%(VALUE)}}" }, \
-  {"synci", "%{!msynci:%{!mno-synci:-m%(VALUE)}}" }
+  {"synci", "%{!msynci:%{!mno-synci:" SYNCI_SPEC "}}" }
 
 
 /* A spec that infers the -mdsp setting from an -march argument.  */
diff --git a/gcc/config/mips/mti-linux.h b/gcc/config/mips/mti-linux.h
new file mode 100644
index 0000000..af3d71f
--- /dev/null
+++ b/gcc/config/mips/mti-linux.h
@@ -0,0 +1,35 @@
+/* Target macros for mips*-mti-linux* targets.
+   Copyright (C) 2012
+   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/>.  */
+
+/* Use the (o)32 ABI and the mips32r2 architecture by default.  */
+#undef MIPS_ABI_DEFAULT
+#define MIPS_ABI_DEFAULT ABI_32
+#undef MIPS_ISA_DEFAULT
+#define MIPS_ISA_DEFAULT 33
+
+/* If -msynci/-mno-synci is not specified, default to -msynci on architectures
+   that support it and -mno-synci on architectures that do not.  */
+#undef SYNCI_SPEC
+#define SYNCI_SPEC "%{!mips32:%{!mips64:-m%(VALUE)}}"
+
+/* This target is a multilib target, specify the sysroot paths.  */
+#undef SYSROOT_SUFFIX_SPEC
+#define SYSROOT_SUFFIX_SPEC \
+    "%{mips32:/mips32}%{mips64:/mips64}%{mips64r2:/mips64r2}%{msoft-float:/sof}%{mel|EL:/el}%{mabi=64:/64}%{mabi=n32:/n32}"
diff --git a/gcc/config/mips/t-mti-linux b/gcc/config/mips/t-mti-linux
new file mode 100644
index 0000000..ba11706
--- /dev/null
+++ b/gcc/config/mips/t-mti-linux
@@ -0,0 +1,24 @@
+# Copyright (C) 2012 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 default build is mips32r2, hard-float big-endian.  Add mips32,
+# soft-float, and little-endian variations.
+
+MULTILIB_OPTIONS = mips32/mips64/mips64r2 msoft-float EL
+MULTILIB_DIRNAMES = mips32 mips64 mips64r2 sof el
+MULTILIB_MATCHES = EL=mel EB=meb