-# frexpl.m4 serial 2
+# 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,
AC_SUBST([FREXPL_LIBM])
])
-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).
+AC_DEFUN([gl_FUNC_FREXPL_NO_LIBM],
+[
+ AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_CACHE_CHECK([whether frexpl() can be used without linking with libm],
+ [gl_cv_func_frexpl_no_libm],
+ [
+ AC_TRY_LINK([#include <math.h>
+ long double x;],
+ [int e; return frexpl (x, &e) > 0;],
+ [gl_cv_func_frexpl_no_libm=yes],
+ [gl_cv_func_frexpl_no_libm=no])
+ ])
+ if test $gl_cv_func_frexpl_no_libm = yes; then
+ gl_FUNC_FREXPL_WORKS
+ case "$gl_cv_func_frexpl_works" in
+ *yes) gl_func_frexpl_no_libm=yes ;;
+ *) gl_func_frexpl_no_libm=no; REPLACE_FREXPL=1 ;;
+ 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 $gl_func_frexpl_no_libm = yes; then
+ AC_DEFINE([HAVE_FREXPL_IN_LIBC], 1,
+ [Define if the frexpl() function is available in libc.])
+ dnl Also check whether it's declared.
+ dnl MacOS X 10.3 has frexpl() in libc but doesn't declare it in <math.h>.
+ AC_CHECK_DECL([frexpl], , [HAVE_DECL_FREXPL=0], [#include <math.h>])
+ else
+ HAVE_DECL_FREXPL=0
+ AC_LIBOBJ([frexpl])
+ fi
+])
+
+dnl Test whether frexpl() works on finite numbers (this fails on AIX 5.1 and
+dnl on BeOS) and also on infinite numbers (this fails e.g. on IRIX 6.5 and
+dnl mingw).
AC_DEFUN([gl_FUNC_FREXPL_WORKS],
[
AC_REQUIRE([AC_PROG_CC])
{
volatile long double x;
/* Test on finite numbers. */
+ x = 16.0L;
{
int exp = -9999;
- x = 16.0L;
frexpl (x, &exp);
if (exp != 5)
return 1;
}
+ /* Test on large finite numbers. This fails on BeOS at i = 16322, while
+ LDBL_MAX_EXP = 16384.
+ In the loop end test, we test x against Infinity, rather than comparing
+ i with LDBL_MAX_EXP, because BeOS <float.h> has a wrong LDBL_MAX_EXP. */
+ {
+ int i;
+ for (i = 1, x = 1.0L; x != x + x; i++, x *= 2.0L)
+ {
+ int exp = -9999;
+ frexpl (x, &exp);
+ if (exp != i)
+ return 1;
+ }
+ }
/* Test on infinite numbers. */
+ x = 1.0L / 0.0L;
{
- x = 1.0L / 0.0L;
int exp;
long double y = frexpl (x, &exp);
if (y != x)
return 0;
}], [gl_cv_func_frexpl_works=yes], [gl_cv_func_frexpl_works=no],
[case "$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
])
])