Hi,

This patch adds the necessary version conditions and configure rules in
place to allow building the D compiler on DragonFlyBSD.

Running the testsuite, all core tests pass, with a couple failures
relating to CTFE math support which are not blocking the library from
being usable, and will be fixed in a follow-up.

OK for mainline?

Regards
Iain

---
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              |  3 +++
 gcc/config/dragonfly-d.c    | 37 +++++++++++++++++++++++++++++++++++++
 gcc/config/t-dragonfly      | 21 +++++++++++++++++++++
 libphobos/configure         |  2 +-
 libphobos/configure.tgt     |  3 +++
 libphobos/m4/druntime/os.m4 |  2 +-
 6 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100644 gcc/config/dragonfly-d.c
 create mode 100644 gcc/config/t-dragonfly

diff --git a/gcc/config.gcc b/gcc/config.gcc
index d14a1a3e812..8fff8da1dd0 100644
--- a/gcc/config.gcc
+++ b/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
diff --git a/gcc/config/dragonfly-d.c b/gcc/config/dragonfly-d.c
new file mode 100644
index 00000000000..70ec820b75d
--- /dev/null
+++ b/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;
diff --git a/gcc/config/t-dragonfly b/gcc/config/t-dragonfly
new file mode 100644
index 00000000000..764ced9cd91
--- /dev/null
+++ b/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)
diff --git a/libphobos/configure b/libphobos/configure
index 4c1116d6f80..455f338a9e8 100755
--- a/libphobos/configure
+++ b/libphobos/configure
@@ -14283,7 +14283,7 @@ fi
 
   druntime_target_posix="no"
   case "$druntime_cv_target_os" in
-    aix*|*bsd*|cygwin*|darwin*|gnu*|linux*|skyos*|*solaris*|sysv*)
+    aix*|*bsd*|cygwin*|darwin*|dragonfly*|gnu*|linux*|skyos*|*solaris*|sysv*)
       druntime_target_posix="yes"
       ;;
   esac
diff --git a/libphobos/configure.tgt b/libphobos/configure.tgt
index 94e42bf5509..1ea9e0c804c 100644
--- a/libphobos/configure.tgt
+++ b/libphobos/configure.tgt
@@ -24,6 +24,9 @@
 LIBPHOBOS_SUPPORTED=no
 LIBDRUNTIME_ONLY=auto
 case "${target}" in
+  *-*-dragonfly*)
+       LIBPHOBOS_SUPPORTED=yes
+       ;;
   aarch64*-*-linux*)
        LIBPHOBOS_SUPPORTED=yes
        ;;
diff --git a/libphobos/m4/druntime/os.m4 b/libphobos/m4/druntime/os.m4
index 47d4c6a6c80..ed93e30f1e9 100644
--- a/libphobos/m4/druntime/os.m4
+++ b/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
-- 
2.27.0

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