-# ldexpl.m4 serial 8
-dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
+# ldexpl.m4 serial 10
+dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_LDEXPL],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_ISNANL]) dnl for ISNANL_LIBM
dnl Check whether it's declared.
dnl MacOS X 10.3 has ldexpl() in libc but doesn't declare it in <math.h>.
AC_CHECK_DECL([ldexpl], , [HAVE_DECL_LDEXPL=0], [#include <math.h>])
LIBS="$save_LIBS"
case "$gl_cv_func_ldexpl_works" in
*yes) gl_func_ldexpl=yes ;;
- *) gl_func_ldexpl=no; REPLACE_LDEXPL=1; LDEXPL_LIBM= ;;
+ *) gl_func_ldexpl=no; REPLACE_LDEXPL=1 ;;
esac
else
gl_func_ldexpl=no
fi
if test $HAVE_DECL_LDEXPL = 0 || test $gl_func_ldexpl = no; then
AC_LIBOBJ([ldexpl])
+ LDEXPL_LIBM="$ISNANL_LIBM"
fi
AC_SUBST([LDEXPL_LIBM])
])
extern long double ldexpl (long double, int);
int main()
{
- volatile long double x1 = 1.0;
- volatile long double y1 = ldexpl (x1, -1);
- volatile long double x2 = 1.73205L;
- volatile long double y2 = ldexpl (x2, 0);
- return (y1 != 0.5L) || (y2 != x2);
+ int result = 0;
+ {
+ volatile long double x = 1.0;
+ volatile long double y = ldexpl (x, -1);
+ if (y != 0.5L)
+ result |= 1;
+ }
+ {
+ volatile long double x = 1.73205L;
+ volatile long double y = ldexpl (x, 0);
+ if (y != x)
+ result |= 2;
+ }
+ return result;
}]])],
[gl_cv_func_ldexpl_works=yes],
[gl_cv_func_ldexpl_works=no],