Building in C++ mode caught a bug here:
 .../src/gdb/darwin-nat.c: In function 'ptid_t darwin_decode_message(mach_msg_header_t*, darwin_thread_t**, inferior**, target_waitstatus*)':
 .../src/gdb/darwin-nat.c:1016:25: error: invalid conversion from 'int' to 'gdb_signal' [-fpermissive]
      status->value.sig = WTERMSIG (wstatus);
			  ^
gdb/ChangeLog:
2016-04-20  Pedro Alves  <palves@redhat.com>
	* darwin-nat.c (darwin_decode_message): Use gdb_signal_from_host.
+2016-04-20  Pedro Alves  <palves@redhat.com>
+
+       * darwin-nat.c (darwin_decode_message): Use gdb_signal_from_host.
+
 2016-04-20  Pedro Alves  <palves@redhat.com>
 
        * aarch64-tdep.c (aarch64_record_load_store): Change type of
 
              else
                {
                  status->kind = TARGET_WAITKIND_SIGNALLED;
-                 status->value.sig = WTERMSIG (wstatus);
+                 status->value.sig = gdb_signal_from_host (WTERMSIG (wstatus));
                }
 
              inferior_debug (4, _("darwin_wait: pid=%d exit, status=0x%x\n"),