From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Fri, 21 Oct 2016 12:33:16 +0000 (-0400)
Subject: Configure: signbit scan assuming too much
X-Git-Tag: v5.25.7~246
X-Git-Url: https://perl5.git.perl.org/perl5.git/commitdiff_plain/b76dad153351f50f46ba283bb0da075b93e89838?ds=inline

Configure: signbit scan assuming too much

It was assuming a negative zero, which is an IEEE-754 only concept.

There is no need to assume the negative zero for the correct
functioning of the signbit, however.
---

diff --git a/Configure b/Configure
index 7c598e9..a68b670 100755
--- a/Configure
+++ b/Configure
@@ -18802,7 +18802,7 @@ $cat >try.c <<EOCP
 int main(int argc, char **argv)
 {
     NV x = 0.0;
-    NV y = -0.0;
+    NV y = -1.0;
     if ((signbit(x) == 0) && (signbit(y) != 0))
 	return 0;
     else