From 386efb7695debaf5f0f328a2e4c9abc342161665 Mon Sep 17 00:00:00 2001
From: Cory Fields <cory-nospam-@coryfields.com>
Date: Wed, 20 Aug 2014 21:02:55 -0400
Subject: [PATCH] build: work around ccache/autotools warning-spamming bug

When using clang and ccache, builds spew lots of:
Clang: warning: argument unused during compilation

Upstream bug: https://bugzilla.samba.org/show_bug.cgi?id=8118

This is harmless, bug annoying. If ccache is being used and the
-Qunused-arguments flag is supported (clang), use it.
---
 configure.ac | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/configure.ac b/configure.ac
index 601ccf0a7..700f4ab70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -656,6 +656,9 @@ if test "x$use_ccache" != "xno"; then
   fi
   AC_MSG_RESULT($use_ccache)
 fi
+if test "x$use_ccache" = "xyes"; then
+    AX_CHECK_PREPROC_FLAG([-Qunused-arguments],[CPPFLAGS="-Qunused-arguments $CPPFLAGS"])
+fi
 
 dnl enable wallet
 AC_MSG_CHECKING([if wallet should be enabled])