[libmath-prime-util-perl] 44/54: ActiveState's gcc can't find builtins. Pre-2005 compiler?

[Partha P. Mukherjee]

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ppm-guest pushed a commit to annotated tag v0.38
in repository libmath-prime-util-perl.

commit ce4360fc2bfb97f2a4e44e546c20e8d97d430848
Author: Dana Jacobsen <dana at acm.org>
Date:   Thu Feb 27 14:58:20 2014 -0800

    ActiveState's gcc can't find builtins.  Pre-2005 compiler?
---
 util.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/util.h b/util.h
index dd8684e..c494ee7 100644
--- a/util.h
+++ b/util.h
@@ -127,7 +127,7 @@ static int is_perfect_square(UV n)
 /* log2floor(n) gives the location of the first set bit (starting from left)
  * ctz(n)       gives the number of times n is divisible by 2
  * clz(n)       gives the number of zeros on the left                       */
-#if defined(__GNUC__)
+#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
  #if BITS_PER_WORD == 64
   #define ctz(n)        ((n) ?    __builtin_ctzll(n) : 64)
   #define clz(n)        ((n) ?    __builtin_clzll(n) : 64)

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