2 dnl Copyright (C) 2011-2020 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_ASINF],
9 AC_REQUIRE([gl_MATH_H_DEFAULTS])
10 AC_REQUIRE([gl_FUNC_ASIN])
12 dnl Persuade glibc <math.h> to declare asinf().
13 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
15 dnl Test whether asinf() exists. Assume that asinf(), if it exists, is
16 dnl defined in the same library as asin().
18 LIBS="$LIBS $ASIN_LIBM"
19 AC_CHECK_FUNCS([asinf])
21 if test $ac_cv_func_asinf = yes; then
22 ASINF_LIBM="$ASIN_LIBM"
25 dnl If the function is declared but does not appear to exist, it may be
26 dnl defined as an inline function. In order to avoid a conflict, we have
27 dnl to define rpl_asinf, not asinf.
28 AC_CHECK_DECLS([asinf], [REPLACE_ASINF=1], , [[#include <math.h>]])
29 ASINF_LIBM="$ASIN_LIBM"
31 AC_SUBST([ASINF_LIBM])