From 22d1e39948304e5852325088cf04c74deba53fa4 Mon Sep 17 00:00:00 2001
From: Philip Prindeville <philipp@redfish-solutions.com>
Date: Sun, 31 Dec 2017 13:34:51 -0700
Subject: Fix 'unused' warnings when building with clang/llvm

---
 libtac/include/libtac.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'libtac/include/libtac.h')

diff --git a/libtac/include/libtac.h b/libtac/include/libtac.h
index c872ff7..23cdc28 100644
--- a/libtac/include/libtac.h
+++ b/libtac/include/libtac.h
@@ -44,6 +44,18 @@ extern "C" {
 #endif
 #include "tacplus.h"
 
+#if defined(__clang__)
+#define __CLANG_PREREQ(maj, min) ((__clang_major__ > (maj)) || (__clang_major__ == (maj) && __clang_minor__ >= (min)))
+#else
+#define __CLANG_PREREQ(maj, min) (0)
+#endif
+
+#if __GNUC_PREREQ(3, 2) || __CLANG_PREREQ(4, 0)
+#define __Unused __attribute__ ((unused))
+#else
+#define __Unused /* unused */
+#endif
+
 #if defined(DEBUGTAC) && !defined(TACDEBUG)
 # ifdef __GNUC__
 #define TACDEBUG(level, fmt, ...) syslog(level, fmt, ## __VA_ARGS__)
-- 
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