-# frexpl.m4 serial 3
+# frexpl.m4 serial 5
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
esac
else
gl_func_frexpl_no_libm=no
+ dnl Set REPLACE_FREXPL here because the system may have frexpl in libm.
+ REPLACE_FREXPL=1
fi
if test $gl_func_frexpl_no_libm = yes; then
AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
fi
])
-dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1) and
-dnl also on infinite numbers (this fails e.g. on IRIX 6.5).
+dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1 and
+dnl on BeOS) and also on infinite numbers (this fails e.g. on IRIX 6.5 and
+dnl mingw).
AC_DEFUN([gl_FUNC_FREXPL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
{
volatile long double x;
/* Test on finite numbers. */
+ x = 16.0L;
{
int exp = -9999;
- x = 16.0L;
frexpl (x, &exp);
if (exp != 5)
return 1;
}
+ /* Test on large finite numbers. This fails on BeOS at i = 16322, while
+ LDBL_MAX_EXP = 16384.
+ In the loop end test, we test x against Infinity, rather than comparing
+ i with LDBL_MAX_EXP, because BeOS <float.h> has a wrong LDBL_MAX_EXP. */
+ {
+ int i;
+ for (i = 1, x = 1.0L; x != x + x; i++, x *= 2.0L)
+ {
+ int exp = -9999;
+ frexpl (x, &exp);
+ if (exp != i)
+ return 1;
+ }
+ }
/* Test on infinite numbers. */
+ x = 1.0L / 0.0L;
{
- x = 1.0L / 0.0L;
int exp;
long double y = frexpl (x, &exp);
if (y != x)
return 0;
}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
[case "$host_os" in
- aix* | irix*) gl_cv_func_frexpl_works="guessing no";;
- *) gl_cv_func_frexpl_works="guessing yes";;
+ aix* | beos* | irix* | mingw* | pw*)
+ gl_cv_func_frexpl_works="guessing no";;
+ *) gl_cv_func_frexpl_works="guessing yes";;
esac
])
])