-# strtod.m4 serial 7
+# strtod.m4 serial 9
dnl Copyright (C) 2002, 2003, 2006, 2007, 2008 Free Software
dnl Foundation, Inc.
dnl This file is free software; the Free Software Foundation
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <math.h>
+/* Compare two numbers with ==.
+ This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+ 'x == x' test. */
+static int
+numeric_equal (double x, double y)
+{
+ return x == y;
+}
]], [[
{
/* Older glibc and Cygwin mis-parse "-0x". */
- char *string = "-0x";
+ const char *string = "-0x";
char *term;
double value = strtod (string, &term);
- if (1 / value != -HUGE_VAL || term != (string + 2))
+ double zero = 0.0;
+ if (1.0 / value != -1.0 / zero || term != (string + 2))
+ return 1;
+ }
+ {
+ /* Many platforms do not parse hex floats. */
+ const char *string = "0XaP+1";
+ char *term;
+ double value = strtod (string, &term);
+ if (value != 20.0 || term != (string + 6))
return 1;
}
{
/* Many platforms do not parse infinities. */
- char *string = "inf";
+ const char *string = "inf";
char *term;
double value = strtod (string, &term);
if (value != HUGE_VAL || term != (string + 3))
return 1;
}
+ {
+ /* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */
+ const char *string = "nan()";
+ char *term;
+ double value = strtod (string, &term);
+ if (numeric_equal (value, value) || term != (string + 5))
+ return 1;
+ }
]])],
[gl_cv_func_strtod_works=yes],
[gl_cv_func_strtod_works=no],