-# floor.m4 serial 5
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# floor.m4 serial 8
+dnl Copyright (C) 2007, 2009-2013 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_FLOOR_IEEE], [
if test $gl_floor_required = ieee && test $REPLACE_FLOOR = 0; then
+ AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether floor works according to ISO C 99 with IEC 60559],
[gl_cv_func_floor_ieee],
[
#include <math.h>
]gl_DOUBLE_MINUS_ZERO_CODE[
]gl_DOUBLE_SIGNBIT_CODE[
-int main()
+static double dummy (double f) { return 0; }
+int main (int argc, char *argv[])
{
+ double (*my_floor) (double) = argc ? floor : dummy;
/* Test whether floor (-0.0) is -0.0. */
- if (signbitd (minus_zerod) && !signbitd (floor (minus_zerod)))
+ if (signbitd (minus_zerod) && !signbitd (my_floor (minus_zerod)))
return 1;
return 0;
}
]])],
[gl_cv_func_floor_ieee=yes],
[gl_cv_func_floor_ieee=no],
- [gl_cv_func_floor_ieee="guessing no"])
+ [case "$host_os" in
+ # Guess yes on glibc systems.
+ *-gnu*) gl_cv_func_floor_ieee="guessing yes" ;;
+ # If we don't know, assume the worst.
+ *) gl_cv_func_floor_ieee="guessing no" ;;
+ esac
+ ])
LIBS="$save_LIBS"
])
case "$gl_cv_func_floor_ieee" in
fi
])
if test $REPLACE_FLOOR = 1; then
- AC_LIBOBJ([floor])
+ dnl No libraries are needed to link lib/floor.c.
FLOOR_LIBM=
fi
AC_SUBST([FLOOR_LIBM])