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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>
maint
Tom G. Christensen 2015-02-04 09:23:16 +01:00 committed by Junio C Hamano
parent b5007211b6
commit bd4e8822da
1 changed files with 2 additions and 1 deletions
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3
ewah/ewok.h
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@ -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)