d: Add dragonflybsd support for D compiler and runtime

gcc/ChangeLog:

	* config.gcc (*-*-dragonfly*): Add dragonfly-d.o and t-dragonfly.
	* config/dragonfly-d.c: New file.
	* config/t-dragonfly: New file.

libphobos/ChangeLog:

	* configure.tgt: Add *-*-dragonfly* as a supported target.
	* configure: Regenerate.
	* m4/druntime/os.m4 (DRUNTIME_OS_SOURCES): Add dragonfly* as a posix
	target.

gcc/config.gcc

@@ -731,6 +731,9 @@ case ${target} in
   extra_options="$extra_options rpath.opt dragonfly.opt"
   default_use_cxa_atexit=yes
   use_gcc_stdint=wrap
+  d_target_objs="${d_target_objs} dragonfly-d.o"
+  tmake_file="${tmake_file} t-dragonfly"
+  target_has_targetdm=yes
   ;;
 *-*-freebsd*)
   # This is the generic ELF configuration of FreeBSD.  Later

gcc/config/dragonfly-d.c

@@ -0,0 +1,37 @@
+/* DragonFly support needed only by D front-end.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+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/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm_d.h"
+#include "d/d-target.h"
+#include "d/d-target-def.h"
+
+/* Implement TARGET_D_OS_VERSIONS for DragonFly targets.  */
+
+static void
+dragonfly_d_os_builtins (void)
+{
+  d_add_builtin_version ("DragonFlyBSD");
+  d_add_builtin_version ("Posix");
+}
+
+#undef TARGET_D_OS_VERSIONS
+#define TARGET_D_OS_VERSIONS dragonfly_d_os_builtins
+
+struct gcc_targetdm targetdm = TARGETDM_INITIALIZER;

gcc/config/t-dragonfly

@@ -0,0 +1,21 @@
+# Copyright (C) 2020 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/>.
+
+dragonfly-d.o: $(srcdir)/config/dragonfly-d.c
+	$(COMPILE) $<
+	$(POSTCOMPILE)

libphobos/configure

@@ -14283,7 +14283,7 @@ fi
 
   druntime_target_posix="no"
   case "$druntime_cv_target_os" in
-    aix*|*bsd*|cygwin*|darwin*|gnu*|linux*|skyos*|*solaris*|sysv*)
+    aix*|*bsd*|cygwin*|darwin*|dragonfly*|gnu*|linux*|skyos*|*solaris*|sysv*)
       druntime_target_posix="yes"
       ;;
   esac

libphobos/configure.tgt

@@ -24,6 +24,9 @@
 LIBPHOBOS_SUPPORTED=no
 LIBDRUNTIME_ONLY=auto
 case "${target}" in
+  *-*-dragonfly*)
+	LIBPHOBOS_SUPPORTED=yes
+	;;
   aarch64*-*-linux*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;

libphobos/m4/druntime/os.m4

@@ -112,7 +112,7 @@ AC_DEFUN([DRUNTIME_OS_SOURCES],
 
   druntime_target_posix="no"
   case "$druntime_cv_target_os" in
-    aix*|*bsd*|cygwin*|darwin*|gnu*|linux*|skyos*|*solaris*|sysv*)
+    aix*|*bsd*|cygwin*|darwin*|dragonfly*|gnu*|linux*|skyos*|*solaris*|sysv*)
       druntime_target_posix="yes"
       ;;
   esac