From 21389b7f3451a482e14fef9bd32257c4c87f4317 Mon Sep 17 00:00:00 2001
From: Thomas Schwinge <thomas@codesourcery.com>
Date: Mon, 5 Dec 2016 11:59:03 +0100
Subject: [PATCH] Hurd, C++: Mach/Hurd headers and MIG stubs are not yet fit
 for C++

..., so handle these in "C" mode still:

	gdb/
	* config/i386/i386gnu.mh (%_S.o %_U.o): Add "-x c" to
	"COMPILE.post".
	* gnu-nat.c: #include Mach/Hurd headers before all others.  Wrap
	Mach/Hurd headers and MIG stubs' prototypes in 'extern "C"'.
	* i386-gnu-nat.c: Likewise.
---
 gdb/ChangeLog              |  6 ++++++
 gdb/config/i386/i386gnu.mh |  3 +++
 gdb/gnu-nat.c              | 35 ++++++++++++++++++++++-------------
 gdb/i386-gnu-nat.c         | 14 +++++++++-----
 4 files changed, 40 insertions(+), 18 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a40eb29765..171d03a23d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,11 @@
 2016-12-08  Thomas Schwinge  <thomas@codesourcery.com>
 
+	* config/i386/i386gnu.mh (%_S.o %_U.o): Add "-x c" to
+	"COMPILE.post".
+	* gnu-nat.c: #include Mach/Hurd headers before all others.  Wrap
+	Mach/Hurd headers and MIG stubs' prototypes in 'extern "C"'.
+	* i386-gnu-nat.c: Likewise.
+
 	* gnu-nat.c (proc_get_exception_port, proc_set_exception_port)
 	(INF_RESUME_MSGPORT_RPC, proc_get_state, _proc_get_exc_port)
 	(proc_steal_exc_port, proc_restore_exc_port, make_proc)
diff --git a/gdb/config/i386/i386gnu.mh b/gdb/config/i386/i386gnu.mh
index 24e817eff5..070497ffc4 100644
--- a/gdb/config/i386/i386gnu.mh
+++ b/gdb/config/i386/i386gnu.mh
@@ -32,6 +32,9 @@ MIGCOM = $(MIG) -cc cat - /dev/null
 	$(CPP) $(CPPFLAGS) $($*-MIGUFLAGS) -x c $< \
 	| $(MIGCOM) -sheader /dev/null -server /dev/null -user $*_U.c -header $*_U.h
 
+# MIG stubs are not yet ready for C++ compilation.
+%_S.o %_U.o : COMPILE.post += -x c
+
 NAT_GENERATED_FILES = notify_S.h notify_S.c \
 	process_reply_S.h process_reply_S.c \
 	msg_reply_S.h msg_reply_S.c msg_U.h msg_U.c \
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index ae4430d754..5fd59a26fd 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -20,14 +20,9 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include "defs.h"
-
-#include <ctype.h>
-#include <limits.h>
-#include <setjmp.h>
-#include <signal.h>
-#include <sys/ptrace.h>
-
+/* Mach/Hurd headers are not yet ready for C++ compilation.  */
+extern "C"
+{
 #include <mach.h>
 #include <mach_error.h>
 #include <mach/exception.h>
@@ -48,6 +43,15 @@
 #include <hurd/sigpreempt.h>
 
 #include <portinfo.h>
+}
+
+#include "defs.h"
+
+#include <ctype.h>
+#include <limits.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <sys/ptrace.h>
 
 #include "inferior.h"
 #include "symtab.h"
@@ -63,12 +67,16 @@
 #include "gnu-nat.h"
 #include "inf-child.h"
 
+/* MIG stubs are not yet ready for C++ compilation.  */
+extern "C"
+{
 #include "exc_request_S.h"
 #include "notify_S.h"
 #include "process_reply_S.h"
 #include "msg_reply_S.h"
 #include "exc_request_U.h"
 #include "msg_U.h"
+}
 
 static process_t proc_server = MACH_PORT_NULL;
 
@@ -1443,6 +1451,12 @@ struct inf *gnu_current_inf = 0;
    multi-threaded, we don't bother to lock this.  */
 struct inf *waiting_inf;
 
+/* MIG stubs are not yet ready for C++ compilation.  */
+extern "C" int exc_server (mach_msg_header_t *, mach_msg_header_t *);
+extern "C" int msg_reply_server (mach_msg_header_t *, mach_msg_header_t *);
+extern "C" int notify_server (mach_msg_header_t *, mach_msg_header_t *);
+extern "C" int process_reply_server (mach_msg_header_t *, mach_msg_header_t *);
+
 /* Wait for something to happen in the inferior, returning what in STATUS.  */
 static ptid_t
 gnu_wait (struct target_ops *ops,
@@ -1458,11 +1472,6 @@ gnu_wait (struct target_ops *ops,
   struct proc *thread;
   struct inf *inf = gnu_current_inf;
 
-  extern int exc_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int msg_reply_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int notify_server (mach_msg_header_t *, mach_msg_header_t *);
-  extern int process_reply_server (mach_msg_header_t *, mach_msg_header_t *);
-
   gdb_assert (inf->task);
 
   if (!inf->threads && !inf->pending_execs)
diff --git a/gdb/i386-gnu-nat.c b/gdb/i386-gnu-nat.c
index add0aa4171..77081b8d6f 100644
--- a/gdb/i386-gnu-nat.c
+++ b/gdb/i386-gnu-nat.c
@@ -17,17 +17,21 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+/* Mach/Hurd headers are not yet ready for C++ compilation.  */
+extern "C"
+{
+#include <mach.h>
+#include <mach_error.h>
+#include <mach/message.h>
+#include <mach/exception.h>
+}
+
 #include "defs.h"
 #include "x86-nat.h"
 #include "inferior.h"
 #include "floatformat.h"
 #include "regcache.h"
 
-#include <mach.h>
-#include <mach_error.h>
-#include <mach/message.h>
-#include <mach/exception.h>
-
 #include "i386-tdep.h"
 
 #include "gnu-nat.h"