Hi Gary,
> > $ grep NEED config.h
>
> % grep NEED lib/config.h
> #define NEED_PRINTF_DIRECTIVE_A 1
> #define NEED_PRINTF_DIRECTIVE_F 1
> /* #undef NEED_PRINTF_DOUBLE */
> /* #undef NEED_PRINTF_ENOMEM */
> /* #undef NEED_PRINTF_FLAG_GROUPING */
> #define NEED_PRINTF_FLAG_LEFTADJUST 1
> #define NEED_PRINTF_FLAG_ZERO 1
> /* #undef NEED_PRINTF_INFINITE_DOUBLE */
> /* #undef NEED_PRINTF_INFINITE_LONG_DOUBLE */
> /* #undef NEED_PRINTF_LONG_DOUBLE */
> /* #undef NEED_PRINTF_UNBOUNDED_PRECISION */
>
> % cc -Ae +DAportable -o printf-minus-zero printf-minus-zero.c
> % ./printf-minus-zero
> 4
> 0 33
Thanks for these precisions. I'm applying this workaround.
2009-02-26 Bruno Haible <br...@clisp.org>
Work around *printf bug with %g directive and 0.0 on HP-UX 10.20.
* m4/printf.m4 (gl_PRINTF_INFINITE): Also test for %g output of -0.0.
Reported by Gary V. Vaughan <g...@gnu.org>.
--- m4/printf.m4.orig 2009-02-26 13:36:00.000000000 +0100
+++ m4/printf.m4 2009-02-26 13:28:39.000000000 +0100
@@ -1,4 +1,4 @@
-# printf.m4 serial 29
+# printf.m4 serial 30
dnl Copyright (C) 2003, 2007-2009 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -125,7 +125,8 @@
])
dnl Test whether the *printf family of functions supports infinite and NaN
-dnl 'double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
+dnl 'double' arguments and negative zero arguments in the %f, %e, %g
+dnl directives. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_infinite.
AC_DEFUN([gl_PRINTF_INFINITE],
@@ -156,6 +157,13 @@
}
return 0;
}
+static int
+have_minus_zero ()
+{
+ static double plus_zero = 0.0;
+ double minus_zero = - plus_zero;
+ return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;
+}
static char buf[10000];
static double zero = 0.0;
int main ()
@@ -187,6 +195,11 @@
if (sprintf (buf, "%g", zero / zero) < 0
|| !strisnan (buf, 0, strlen (buf)))
return 1;
+ /* This test fails on HP-UX 10.20. */
+ if (have_minus_zero ())
+ if (sprintf (buf, "%g", - zero) < 0
+ || strcmp (buf, "-0") != 0)
+ return 1;
return 0;
}], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
[
@@ -1357,7 +1370,7 @@
dnl AIX 4.3.2, 5.1 # . # # # # . . . . . # . .
. . . . . .
dnl HP-UX 11.31 . . . . # . . . . . . # . .
. . # # . .
dnl HP-UX 11.{00,11,23} # . . . # # . . . . . # . .
. . # # . #
-dnl HP-UX 10.20 # . . . # # . ? . . # # . .
. . # # ? #
+dnl HP-UX 10.20 # . # . # # . ? . . # # . .
. . # # ? #
dnl IRIX 6.5 # . # # # # . # . . . # . .
. . # . . .
dnl OSF/1 5.1 # . # # # # . . . . . # . .
. . # . . #
dnl OSF/1 4.0d # . # # # # . . . . . # . .
# # # # # #
