[dragonfly] Add D language support for DragonFlyBSD x86

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 09fb9ecd2cd..14f0a1abbc8 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -724,6 +724,9 @@  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
diff --git a/gcc/config/dragonfly-d.c b/gcc/config/dragonfly-d.c
new file mode 100644
index 00000000000..b8d4a9ff45d
--- /dev/null
+++ b/gcc/config/dragonfly-d.c
@@ -0,0 +1,49 @@ 
+/* DragonFly support needed only by D front-end.
+   Copyright (C) 2019 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");
+}
+
+/* Implement TARGET_D_CRITSEC_SIZE for DragonFly targets.  */
+
+static unsigned
+dragonfly_d_critsec_size (void)
+{
+  /* This is the sizeof pthread_mutex_t, an opaque pointer.  */
+  return POINTER_SIZE_UNITS;
+}
+
+#undef TARGET_D_OS_VERSIONS
+#define TARGET_D_OS_VERSIONS dragonfly_d_os_builtins
+
+#undef TARGET_D_CRITSEC_SIZE
+#define TARGET_D_CRITSEC_SIZE dragonfly_d_critsec_size
+
+struct gcc_targetdm targetdm = TARGETDM_INITIALIZER;
diff --git a/gcc/config/t-dragonfly b/gcc/config/t-dragonfly
new file mode 100644
index 00000000000..34fc389d965
--- /dev/null
+++ b/gcc/config/t-dragonfly
@@ -0,0 +1,21 @@ 
+# 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/>.
+
+dragonfly-d.o: $(srcdir)/config/dragonfly-d.c
+       $(COMPILE) $<
+       $(POSTCOMPILE)
diff --git a/libphobos/configure.tgt b/libphobos/configure.tgt
index a53a3c3c3be..f9c881a8418 100644
--- a/libphobos/configure.tgt
+++ b/libphobos/configure.tgt
@@ -23,6 +23,9 @@ 
 # broken systems.  More targets shall be added after testing.
 LIBPHOBOS_SUPPORTED=no
 case "${target}" in
+  *-*-dragonfly*)
+	LIBPHOBOS_SUPPORTED=yes
+	;;
   arm*-*-linux*)
 	LIBPHOBOS_SUPPORTED=yes
 	;;