From 334586bb07ec847e3fb6e0e6b56f6d86704943bc Mon Sep 17 00:00:00 2001
From: Jonathan Schleifer <js@webkeks.org>
Date: Wed, 21 Nov 2012 23:26:50 +0100
Subject: [PATCH] configure: Check for buggy -Wcast-align.

---
 configure.ac | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index f636e80..829d065 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,10 +90,32 @@ PKG_CHECK_MODULES(libidn, [libidn >= 0.25], [
 ])
 
 AS_IF([test x"$GOBJC" = x"yes"], [
-	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wcast-align -Wpointer-arith"
+	OBJCFLAGS="$OBJCFLAGS -Wwrite-strings -Wpointer-arith"
 	dnl We need -Wno-deprecated-declarations as OpenSSL is deprecated on
 	dnl OS X.
 	OBJCFLAGS="$OBJCFLAGS -Wno-deprecated-declarations -Werror"
+
+	old_OBJCFLAGS="$OBJCFLAGS"
+	OBJCFLAGS="$OBJCFLAGS -Wcast-align"
+	AC_MSG_CHECKING(whether -Wcast-align is buggy)
+	AC_TRY_COMPILE([
+		#import <ObjFW/OFObject.h>
+
+		@interface Foo: OFObject
+		@end
+
+		@implementation Foo
+		- (void)foo
+		{
+		}
+		@end
+	], [
+	], [
+		AC_MSG_RESULT(no)
+	], [
+		AC_MSG_RESULT(yes)
+		OBJCFLAGS="$old_OBJCFLAGS"
+	])
 ])
 
 BUILDSYS_INIT