-# ceill.m4 serial 8
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# ceill.m4 serial 13
+dnl Copyright (C) 2007, 2009-2012 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.
[
m4_divert_text([DEFAULTS], [gl_ceill_required=plain])
AC_REQUIRE([gl_MATH_H_DEFAULTS])
+ AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
dnl Persuade glibc <math.h> to declare ceill().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
dnl Test whether ceill() is declared.
- AC_CHECK_DECLS([ceill], , , [#include <math.h>])
+ AC_CHECK_DECLS([ceill], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_ceill" = yes; then
dnl Test whether ceill() can be used without libm.
gl_FUNC_CEILL_LIBS
#include <math.h>
]gl_LONG_DOUBLE_MINUS_ZERO_CODE[
]gl_LONG_DOUBLE_SIGNBIT_CODE[
-int main()
+static long double dummy (long double f) { return 0; }
+int main (int argc, char *argv[])
{
+ long double (*my_ceill) (long double) = argc ? ceill : dummy;
/* Test whether ceill (-0.3L) is -0.0L. */
- if (signbitl (minus_zerol) && !signbitl (ceill (-0.3L)))
+ if (signbitl (minus_zerol) && !signbitl (my_ceill (-0.3L)))
return 1;
return 0;
}
HAVE_DECL_CEILL=0
fi
if test $HAVE_DECL_CEILL = 0 || test $REPLACE_CEILL = 1; then
- AC_LIBOBJ([ceill])
- CEILL_LIBM=
+ dnl Find libraries needed to link lib/ceill.c.
+ if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+ AC_REQUIRE([gl_FUNC_CEIL])
+ CEILL_LIBM="$CEIL_LIBM"
+ else
+ CEILL_LIBM=
+ fi
fi
AC_SUBST([CEILL_LIBM])
])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ long double (*funcptr) (long double) = ceill;
long double x;]],
- [[x = ceill(x);]])],
+ [[x = funcptr(x) + ceill(x);]])],
[gl_cv_func_ceill_libm=])
if test "$gl_cv_func_ceill_libm" = "?"; then
save_LIBS="$LIBS"
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ long double (*funcptr) (long double) = ceill;
long double x;]],
- [[x = ceill(x);]])],
+ [[x = funcptr(x) + ceill(x);]])],
[gl_cv_func_ceill_libm="-lm"])
LIBS="$save_LIBS"
fi