From 2ffaf7fd46f5ac5318a16cc6be86f0ab57dcd3fb Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@collabora.com>
Date: Sun, 20 Nov 2022 22:09:10 +0000
Subject: [PATCH] ipc: Add C++ guards to generated headers

---
 src/xrt/ipc/shared/ipcproto/common.py | 15 +++++++++++++++
 src/xrt/ipc/shared/proto.py           | 16 +++++++++++++---
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/xrt/ipc/shared/ipcproto/common.py b/src/xrt/ipc/shared/ipcproto/common.py
index 336b8839d..0b8288cfd 100644
--- a/src/xrt/ipc/shared/ipcproto/common.py
+++ b/src/xrt/ipc/shared/ipcproto/common.py
@@ -6,6 +6,21 @@
 import json
 import re
 
+def write_cpp_header_guard_start(f):
+    """Write the starting C in C++ header guard"""
+    f.write('''
+#ifdef __cplusplus
+extern "C" {
+#endif
+''')
+
+def write_cpp_header_guard_end(f):
+    """Write the ending C in C++ header guard"""
+    f.write('''
+#ifdef __cplusplus
+}
+#endif
+''')
 
 def write_with_wrapped_args(f, start, args, indent):
     """Write something like a declaration or call."""
diff --git a/src/xrt/ipc/shared/proto.py b/src/xrt/ipc/shared/proto.py
index 6d66dfb29..0be409fda 100755
--- a/src/xrt/ipc/shared/proto.py
+++ b/src/xrt/ipc/shared/proto.py
@@ -6,7 +6,8 @@
 import argparse
 
 from ipcproto.common import (Proto, write_decl, write_invocation,
-                             write_result_handler)
+                             write_result_handler, write_cpp_header_guard_start,
+                             write_cpp_header_guard_end)
 
 header = '''// Copyright 2020, Collabora, Ltd.
 // SPDX-License-Identifier: BSL-1.0
@@ -221,13 +222,16 @@ def generate_client_h(file, p):
 #include "ipc_protocol_generated.h"
 #include "client/ipc_client.h"
 
-
-
 ''')
+    write_cpp_header_guard_start(f)
+    f.write("\n")
 
     for call in p.calls:
         call.write_call_decl(f)
         f.write(";\n")
+
+    write_cpp_header_guard_end(f)
+
     f.close()
 
 
@@ -383,6 +387,10 @@ def generate_server_header(file, p):
 
 
 ''')
+
+    write_cpp_header_guard_start(f)
+    f.write("\n")
+
     # This decl is constant, but we must write it here
     # because it depends on a generated enum.
     write_decl(
@@ -399,6 +407,8 @@ def generate_server_header(file, p):
     for call in p.calls:
         call.write_handler_decl(f)
         f.write(";\n")
+
+    write_cpp_header_guard_end(f)
     f.close()