From bd4e8822da3bf6ce28a0c5f7c1bbf1b6341c0586 Mon Sep 17 00:00:00 2001
From: "Tom G. Christensen" <tgc@statsbiblioteket.dk>
Date: Wed, 4 Feb 2015 09:23:16 +0100
Subject: ewah: fix building with gcc < 3.4.0

The __builtin_ctzll function was added in gcc 3.4.0.
This extends the check for gcc so that use of __builtin_ctzll is only
enabled if gcc >= 3.4.0.

Signed-off-by: Tom G. Christensen <tgc@statsbiblioteket.dk>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/ewah/ewok.h b/ewah/ewok.h
index 43adeb5..4b95847 100644
--- a/ewah/ewok.h
+++ b/ewah/ewok.h
@@ -47,7 +47,8 @@ static inline uint32_t ewah_bit_popcount64(uint64_t x)
 	return (x * 0x0101010101010101ULL) >> 56;
 }
 
-#ifdef __GNUC__
+/* __builtin_ctzll was not available until 3.4.0 */
+#if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3  && __GNUC_MINOR > 3))
 #define ewah_bit_ctz64(x) __builtin_ctzll(x)
 #else
 static inline int ewah_bit_ctz64(uint64_t x)
-- 
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