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# tanf.m4 serial 3
dnl Copyright (C) 2011-2023 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.
AC_DEFUN([gl_FUNC_TANF],
[
AC_REQUIRE([gl_MATH_H_DEFAULTS])
AC_REQUIRE([gl_FUNC_TAN])
dnl Persuade glibc <math.h> to declare tanf().
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
dnl Test whether tanf() exists. Assume that tanf(), if it exists, is
dnl defined in the same library as tan().
save_LIBS="$LIBS"
LIBS="$LIBS $TAN_LIBM"
AC_CHECK_FUNCS([tanf])
LIBS="$save_LIBS"
if test $ac_cv_func_tanf = yes; then
TANF_LIBM="$TAN_LIBM"
else
HAVE_TANF=0
dnl If the function is declared but does not appear to exist, it may be
dnl defined as an inline function. In order to avoid a conflict, we have
dnl to define rpl_tanf, not tanf.
AC_CHECK_DECLS([tanf], [REPLACE_TANF=1], , [[#include <math.h>]])
TANF_LIBM="$TAN_LIBM"
fi
AC_SUBST([TANF_LIBM])
])
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