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changeset 10417:16acbb4dea09

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signbit: work around bug of HP-UX 10.20 cc with -0.0 literal * m4/signbit.m4 (gl_SIGNBIT_TEST_PROGRAM): Rewrite test to avoid literal -0.0. Reported by Jonathan C. Patschke <jp@centtech.com>. Signed-off-by: Eric Blake <ebb9@byu.net>
author Eric Blake <ebb9@byu.net>
date Fri, 12 Sep 2008 06:30:32 -0600
parents 9a7816903705
children 1e251b3d489c
files ChangeLog m4/signbit.m4
diffstat 2 files changed, 12 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-09-12  Eric Blake  <ebb9@byu.net>
+
+	signbit: work around bug of HP-UX 10.20 cc with -0.0 literal
+	* m4/signbit.m4 (gl_SIGNBIT_TEST_PROGRAM): Rewrite test to avoid
+	literal -0.0.
+	Reported by Jonathan C. Patschke <jp@centtech.com>.
+
 2008-09-11  Yoann Vandoorselaere  <yoann.v@prelude-ids.com>
 
 	* lib/glthread/cond.h: Use dummy implementation also if
--- a/m4/signbit.m4
+++ b/m4/signbit.m4
@@ -124,12 +124,14 @@
 ])
 
 AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [
+/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
+   So we use -p0f instead.  */
 float p0f = 0.0f;
-float m0f = -0.0f;
+float m0f = -p0f;
 double p0d = 0.0;
-double m0d = -0.0;
+double m0d = -p0d;
 long double p0l = 0.0L;
-long double m0l = -0.0L;
+long double m0l = -p0l;
 int main ()
 {
   {