Add support to build for x86_64-zephyr-elf

This adds the necessary bits to build for x86_64-zephyr-elf with
multilib support (m32 and m64), following the x86_64-*-linux*
footsteps.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: dcpleung

config/dfp.m4

@@ -21,6 +21,7 @@ Valid choices are 'yes', 'bid', 'dpd', and 'no'.]) ;;
 [
   case $1 in
     powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux* | s390*-*-linux* | \
+    x86_64-zephyr-* | \
     i?86*-*-elfiamcu | i?86*-*-gnu* | x86_64*-*-gnu* | \
     i?86*-*-mingw* | x86_64*-*-mingw* | \
     i?86*-*-cygwin* | x86_64*-*-cygwin*)

gcc/acinclude.m4

@@ -460,6 +460,18 @@ AC_DEFUN([gcc_GAS_FLAGS],
     dnl Override the default, which may be incompatible.
     gcc_cv_as_flags=--64
     ;;
+  i[[34567]]86-zephyr*)
+    dnl Override the default, which may be incompatible.
+    gcc_cv_as_flags=--32
+    ;;
+  x86_64-zephyr-elfx32)
+    dnl Override the default, which may be incompatible.
+    gcc_cv_as_flags=--x32
+    ;;
+  x86_64-zephyr*)
+    dnl Override the default, which may be incompatible.
+    gcc_cv_as_flags=--64
+    ;;
   powerpc*-*-darwin*)
     dnl Always pass -arch ppc to assembler.
     gcc_cv_as_flags="-arch ppc"

gcc/config.gcc

@@ -1898,6 +1898,11 @@ i[34567]86-*-elfiamcu)
 i[34567]86-*-elf*)
 	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h"
 	;;
+x86_64-zephyr-elf*)
+	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h"
+	tm_file="${tm_file} i386/zephyr64.h"
+	tmake_file="${tmake_file} i386/t-zephyr64"
+	;;
 x86_64-*-elf*)
 	tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h newlib-stdint.h i386/i386elf.h i386/x86-64.h"
 	;;

gcc/config/i386/t-zephyr64

@@ -0,0 +1,38 @@
+# Copyright (C) 2002-2018 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/>.
+
+# On Debian, Ubuntu and other derivative distributions, the 32bit libraries
+# are found in /lib32 and /usr/lib32, /lib64 and /usr/lib64 are symlinks to
+# /lib and /usr/lib, while other distributions install libraries into /lib64
+# and /usr/lib64.  The LSB does not enforce the use of /lib64 and /usr/lib64,
+# it doesn't tell anything about the 32bit libraries on those systems.  Set
+# MULTILIB_OSDIRNAMES according to what is found on the target.
+
+# To support i386, x86-64 and x32 libraries, the directory structrue
+# should be:
+#
+# 	/lib has i386 libraries.
+# 	/lib64 has x86-64 libraries.
+# 	/libx32 has x32 libraries.
+#
+MULTILIB_OPTIONS    = m64/m32 msoft-float
+MULTILIB_DIRNAMES   = 64 32 soft-float
+MULTILIB_REQUIRED   = m64 m32 m32/msoft-float
+MULTILIB_EXCEPTIONS = msoft-float
+MULTILIB_OSDIRNAMES = m64=!64 m32=!32 m32/msoft-float=!32/soft-float
+MULTILIB_MATCHES    = msoft-float=mno-80387

gcc/config/i386/zephyr64.h

@@ -0,0 +1,39 @@
+/* Definitions for x86-64 for Zephyr 64-bit toolchain.
+   Copyright (C) 2001-2019 Free Software Foundation, Inc.
+   Contributed by Jan Hubicka <jh@suse.cz>, based on linux.h.
+   Based on gnu-user64.h.
+
+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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend.o%s"
+
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC "crtbegin.o%s"
+
+#undef	LINK_SPEC
+#define LINK_SPEC \
+	"%{m32:-m elf_i386} \
+	 %{m64:-m elf_x86_64} \
+	 %{mx32:-m elf32_x86_64}"
+
+#define MULTILIB_DEFAULTS { "m64" }

gcc/configure

@@ -7897,6 +7897,7 @@ else
 
   case $target in
     powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux* | s390*-*-linux* | \
+    x86_64*-zephyr-* | \
     i?86*-*-elfiamcu | i?86*-*-gnu* | x86_64*-*-gnu* | \
     i?86*-*-mingw* | x86_64*-*-mingw* | \
     i?86*-*-cygwin* | x86_64*-*-cygwin*)
@@ -15431,7 +15432,7 @@ ia64-*-hpux*)
   rm -rf conftest*
   ;;
 
-x86_64-*kfreebsd*-gnu|x86_64-*linux*|powerpc*-*linux*| \
+x86_64-*kfreebsd*-gnu|x86_64-*linux*|x86_64-zephyr-*|powerpc*-*linux*| \
 s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
   # Find out which ABI we are using.
   echo 'int i;' > conftest.$ac_ext
@@ -15446,7 +15447,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_i386_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    case `/usr/bin/file conftest.o` in
 	      *x86-64*)
 		LD="${LD-ld} -m elf32_x86_64"
@@ -15475,7 +15476,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_x86_64_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    LD="${LD-ld} -m elf_x86_64"
 	    ;;
 	  powerpcle-*linux*)
@@ -23724,6 +23725,15 @@ else
   x86_64-*-linux*)
         gcc_cv_as_flags=--64
     ;;
+  i[34567]86-zephyr*)
+        gcc_cv_as_flags=--32
+    ;;
+  x86_64-zephyr-elfx32)
+        gcc_cv_as_flags=--x32
+    ;;
+  x86_64-zephyr*)
+        gcc_cv_as_flags=--64
+    ;;
   powerpc*-*-darwin*)
         gcc_cv_as_flags="-arch ppc"
     ;;

libatomic/configure

@@ -6872,7 +6872,7 @@ ia64-*-hpux*)
   rm -rf conftest*
   ;;
 
-x86_64-*kfreebsd*-gnu|x86_64-*linux*|powerpc*-*linux*| \
+x86_64-*kfreebsd*-gnu|x86_64-*linux*|x86_64-zephyr-*|powerpc*-*linux*| \
 s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
   # Find out which ABI we are using.
   echo 'int i;' > conftest.$ac_ext
@@ -6887,7 +6887,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_i386_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    case `/usr/bin/file conftest.o` in
 	      *x86-64*)
 		LD="${LD-ld} -m elf32_x86_64"
@@ -6916,7 +6916,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_x86_64_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    LD="${LD-ld} -m elf_x86_64"
 	    ;;
 	  powerpcle-*linux*)

libbacktrace/configure

@@ -7268,7 +7268,7 @@ ia64-*-hpux*)
   rm -rf conftest*
   ;;
 
-x86_64-*kfreebsd*-gnu|x86_64-*linux*|powerpc*-*linux*| \
+x86_64-*kfreebsd*-gnu|x86_64-*linux*|x86_64-zephyr-*|powerpc*-*linux*| \
 s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
   # Find out which ABI we are using.
   echo 'int i;' > conftest.$ac_ext
@@ -7283,7 +7283,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_i386_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    case `/usr/bin/file conftest.o` in
 	      *x86-64*)
 		LD="${LD-ld} -m elf32_x86_64"
@@ -7312,7 +7312,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_x86_64_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    LD="${LD-ld} -m elf_x86_64"
 	    ;;
 	  powerpcle-*linux*)

libcc1/configure

@@ -6535,7 +6535,7 @@ ia64-*-hpux*)
   rm -rf conftest*
   ;;
 
-x86_64-*kfreebsd*-gnu|x86_64-*linux*|powerpc*-*linux*| \
+x86_64-*kfreebsd*-gnu|x86_64-*linux*|x86_64-zephyr-*|powerpc*-*linux*| \
 s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
   # Find out which ABI we are using.
   echo 'int i;' > conftest.$ac_ext
@@ -6550,7 +6550,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_i386_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    case `/usr/bin/file conftest.o` in
 	      *x86-64*)
 		LD="${LD-ld} -m elf32_x86_64"
@@ -6579,7 +6579,7 @@ s390*-*linux*|s390*-*tpf*|sparc*-*linux*)
 	  x86_64-*kfreebsd*-gnu)
 	    LD="${LD-ld} -m elf_x86_64_fbsd"
 	    ;;
-	  x86_64-*linux*)
+	  x86_64-*linux*|x86_64-zephyr-*)
 	    LD="${LD-ld} -m elf_x86_64"
 	    ;;
 	  powerpcle-*linux*)

libdecnumber/configure

@@ -4904,6 +4904,7 @@ else
 
   case $target in
     powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux* | s390*-*-linux* | \
+    x86_64-zephyr-* | \
     i?86*-*-elfiamcu | i?86*-*-gnu* | x86_64*-*-gnu* | \
     i?86*-*-mingw* | x86_64*-*-mingw* | \
     i?86*-*-cygwin* | x86_64*-*-cygwin*)