2 dnl Copyright (C) 2011-2018 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_RINTL],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
12 dnl Persuade glibc <math.h> to declare rintl().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 dnl Determine RINTL_LIBM.
16 gl_MATHFUNC([rintl], [long double], [(long double)])
17 if test $gl_cv_func_rintl_no_libm = no \
18 && test $gl_cv_func_rintl_in_libm = no; then
20 dnl Find libraries needed to link lib/rintl.c.
21 if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
22 AC_REQUIRE([gl_FUNC_RINT])
23 RINTL_LIBM="$RINT_LIBM"
28 AC_SUBST([RINTL_LIBM])