From 9777492dde8ad40882b804fcda332cb3e1f46271 Mon Sep 17 00:00:00 2001
From: Lubomir Rintel <lkundrak@v3.sk>
Date: Wed, 7 Feb 2018 11:23:08 +0100
Subject: [PATCH] m4: disable -Wcast-function-type

This fixes the GCC 8 build. It disables the warning conditionally so that we
get the warning back if glib gets fixed.

(cherry picked from commit 631982a796a0eeb412551c61469a1cfb83e3f438)
---
 m4/compiler_options.m4 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/m4/compiler_options.m4 b/m4/compiler_options.m4
index ccb51f5e6..2350571e2 100644
--- a/m4/compiler_options.m4
+++ b/m4/compiler_options.m4
@@ -127,6 +127,16 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
 		[union { int a[1]; int b[2]; } c = { 0 }]
 	)
 
+	dnl a new warning in gcc 8, glib 2.55 doesn't play nice yet
+	NM_COMPILER_WARNING([cast-function-type],
+		[#include <glib-object.h>]
+		[typedef struct { GObject parent; } NMObject;]
+		[typedef struct { GObjectClass parent; } NMObjectClass;]
+		[static void nm_object_init (NMObject *object) { } ]
+		[static void nm_object_class_init (NMObjectClass *object) { }]
+		[G_DEFINE_TYPE (NMObject, nm_object, G_TYPE_OBJECT)]
+	)
+
 	CFLAGS="$CFLAGS_MORE_WARNINGS $CFLAGS"
 else
 	AC_MSG_RESULT(no)
-- 
2.14.3