From: Eric Blake <ebb9@byu.net>
Date: Tue, 24 Feb 2009 13:15:59 +0000 (-0700)
Subject: strtod: detect HP-UX 11.31 bug
X-Git-Tag: v0.1~6276
X-Git-Url: http://erislabs.org.uk/gitweb/?a=commitdiff_plain;h=61c74776c4a0dc5faa23dbc1ad0f9dd23bf14521;p=gnulib.git

strtod: detect HP-UX 11.31 bug

* m4/strtod.m4 (gl_FUNC_STRTOD): Detect errno handling bug.
Reported by Gary V. Vaughan.

Signed-off-by: Eric Blake <ebb9@byu.net>
---

diff --git a/ChangeLog b/ChangeLog
index ec08cde60..23382729f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2009-02-24  Eric Blake  <ebb9@byu.net>
+
+	strtod: detect HP-UX 11.31 bug
+	* m4/strtod.m4 (gl_FUNC_STRTOD): Detect errno handling bug.
+	Reported by Gary V. Vaughan.
+
 2009-02-23  Bruno Haible  <bruno@clisp.org>
 
 	Fix invalid read past end of memory block.
diff --git a/m4/strtod.m4 b/m4/strtod.m4
index caaaa4b45..1f301c2ee 100644
--- a/m4/strtod.m4
+++ b/m4/strtod.m4
@@ -1,4 +1,4 @@
-# strtod.m4 serial 10
+# strtod.m4 serial 11
 dnl Copyright (C) 2002-2003, 2006-2009 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -18,6 +18,7 @@ AC_DEFUN([gl_FUNC_STRTOD],
       [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
 #include <stdlib.h>
 #include <math.h>
+#include <errno.h>
 /* Compare two numbers with ==.
    This is a separate function because IRIX 6.5 "cc -O" miscompiles an
    'x == x' test.  */
@@ -45,11 +46,13 @@ numeric_equal (double x, double y)
       return 1;
   }
   {
-    /* Many platforms do not parse infinities.  */
+    /* Many platforms do not parse infinities.  HP-UX 11.31 parses inf,
+       but mistakenly sets errno.  */
     const char *string = "inf";
     char *term;
+    errno = 0;
     double value = strtod (string, &term);
-    if (value != HUGE_VAL || term != (string + 3))
+    if (value != HUGE_VAL || term != (string + 3) || errno)
       return 1;
   }
   {