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According to Bruno Haible on 8/1/2008 3:30 AM:
> Jonathan C. Patschke wrote:
>> That fixes the problem in test-frexp and test-strtod, but not test-frexpl
>> (which still fails the (mantissa == x) assertion).
>
> Thanks. I'm applying the patch below, assuming that if the compiler
> confuses -0.0 with 0.0, it also confuses -0.0L with 0.0, and -0.0f with 0.0f.
> 2008-08-01 Bruno Haible <[EMAIL PROTECTED]>
>
> Work around bug of HP-UX 10.20 cc with -0.0 literal.
> * tests/test-isnanf.h (zero): New variable.
> (main): Avoid literal -0.0f.
...
It looks like you failed to check .m4 tests. I'm applying the patch
below. Meanwhile, I have a question about tests/test-signbit.c - your
patch changed most occurrences of -0.0L to -zerol, to work around one HP
bug, but there is another comment that states:
/* We cannot use the expression '-zerol' here, because on HP-UX/hppa it
evaluates to 0.0L, not -0.0L. */
long double minus_zerol = -0.0L;
and still uses minus_zerol throughout the file. So which is it, or are we
really stuck with no portable way to represent negative zero across the
spectrum of HP compilers/architectures?
- --
Don't work too hard, make some time for fun as well!
Eric Blake [EMAIL PROTECTED]
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>From b5664d94a7ab12c880505b39519743fd5df66c63 Mon Sep 17 00:00:00 2001
From: Eric Blake <[EMAIL PROTECTED]>
Date: Fri, 12 Sep 2008 06:30:32 -0600
Subject: [PATCH] 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 <[EMAIL PROTECTED]>.
Signed-off-by: Eric Blake <[EMAIL PROTECTED]>
---
ChangeLog | 7 +++++++
m4/signbit.m4 | 8 +++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index c895a9b..bf7fcc9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-09-12 Eric Blake <[EMAIL PROTECTED]>
+
+ 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 <[EMAIL PROTECTED]>.
+
2008-09-11 Yoann Vandoorselaere <[EMAIL PROTECTED]>
* lib/glthread/cond.h: Use dummy implementation also if
diff --git a/m4/signbit.m4 b/m4/signbit.m4
index 152a32e..1748453 100644
--- a/m4/signbit.m4
+++ b/m4/signbit.m4
@@ -124,12 +124,14 @@ AC_DEFUN([gl_SIGNBIT],
])
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 ()
{
{
--
1.6.0
