2 dnl Copyright (C) 2007 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_ROUNDF],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 dnl Persuade glibc <math.h> to declare roundf().
11 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
12 AC_CHECK_DECLS([roundf], , , [#include <math.h>])
13 if test "$ac_cv_have_decl_roundf" = yes; then
14 gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = roundf (x);])
16 if test "$ac_cv_have_decl_roundf" != yes || test "$ROUNDF_LIBM" = missing; then
17 AC_CHECK_DECLS([ceilf, floorf], , , [#include <math.h>])
18 if test "$ac_cv_have_decl_floorf" = yes &&
19 test "$ac_cv_have_decl_ceilf" = yes; then
20 gl_CHECK_MATH_LIB([ROUNDF_LIBM], [x = floorf (x) + ceilf (x);])
27 AC_SUBST([HAVE_DECL_ROUNDF])
28 AC_SUBST([ROUNDF_LIBM])