-# ceilf.m4 serial 8
-dnl Copyright (C) 2007, 2009-2010 Free Software Foundation, Inc.
+# ceilf.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.
dnl Persuade glibc <math.h> to declare ceilf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether ceilf() is declared.
- AC_CHECK_DECLS([ceilf], , , [#include <math.h>])
+ AC_CHECK_DECLS([ceilf], , , [[#include <math.h>]])
if test "$ac_cv_have_decl_ceilf" = yes; then
dnl Test whether ceilf() can be used without libm.
gl_FUNC_CEILF_LIBS
#include <math.h>
]gl_FLOAT_MINUS_ZERO_CODE[
]gl_FLOAT_SIGNBIT_CODE[
-int main()
+static float dummy (float f) { return 0; }
+int main (int argc, char *argv[])
{
+ float (*my_ceilf) (float) = argc ? ceilf : dummy;
+ int result = 0;
/* Test whether ceilf (-0.0f) is -0.0f. */
- if (signbitf (minus_zerof) && !signbitf (ceilf (minus_zerof)))
- return 1;
- return 0;
+ if (signbitf (minus_zerof) && !signbitf (my_ceilf (minus_zerof)))
+ result |= 1;
+ /* Test whether ceilf (-0.3f) is -0.0f. */
+ if (signbitf (-0.3f) && !signbitf (my_ceilf (-0.3f)))
+ result |= 2;
+ return result;
}
]])],
[gl_cv_func_ceilf_ieee=yes],
HAVE_DECL_CEILF=0
fi
if test $HAVE_DECL_CEILF = 0 || test $REPLACE_CEILF = 1; then
- AC_LIBOBJ([ceilf])
+ dnl No libraries are needed to link lib/ceilf.c.
CEILF_LIBM=
fi
AC_SUBST([CEILF_LIBM])
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ float (*funcptr) (float) = ceilf;
float x;]],
- [[x = ceilf(x);]])],
+ [[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm=])
if test "$gl_cv_func_ceilf_libm" = "?"; then
save_LIBS="$LIBS"
# define __NO_MATH_INLINES 1 /* for glibc */
#endif
#include <math.h>
+ float (*funcptr) (float) = ceilf;
float x;]],
- [[x = ceilf(x);]])],
+ [[x = funcptr(x) + ceilf(x);]])],
[gl_cv_func_ceilf_libm="-lm"])
LIBS="$save_LIBS"
fi