-# ceil.m4 serial 5
-dnl Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
+# ceil.m4 serial 9
+dnl Copyright (C) 2007, 2009-2014 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.
fi
m4_ifdef([gl_FUNC_CEIL_IEEE], [
if test $gl_ceil_required = ieee && test $REPLACE_CEIL = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether ceil works according to ISO C 99 with IEC 60559],
[gl_cv_func_ceil_ieee],
[
#include <math.h>
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
-int main()
+static double dummy (double f) { return 0; }
+int main (int argc, char *argv[])
{
+ double (*my_ceil) (double) = argc ? ceil : dummy;
+ int result = 0;
/* Test whether ceil (-0.0) is -0.0. */
- if (signbitd (minus_zerod) && !signbitd (ceil (minus_zerod)))
- return 1;
- return 0;
+ if (signbitd (minus_zerod) && !signbitd (my_ceil (minus_zerod)))
+ result |= 1;
+ /* Test whether ceil (-0.3) is -0.0. */
+ if (signbitd (-0.3) && !signbitd (my_ceil (-0.3)))
+ result |= 2;
+ return result;
}
]])],
[gl_cv_func_ceil_ieee=yes],
[gl_cv_func_ceil_ieee=no],
- [gl_cv_func_ceil_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_ceil_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_ceil_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_ceil_ieee" in
fi
])
if test $REPLACE_CEIL = 1; then
- AC_LIBOBJ([ceil])
+ dnl No libraries are needed to link lib/ceil.c.
CEIL_LIBM=
fi
AC_SUBST([CEIL_LIBM])