##### http://autoconf-archive.cryp.to/ac_c_var_func.html
#
# SYNOPSIS
#
#   AC_C_VAR_FUNC
#
# DESCRIPTION
#
#   This macro tests if the C complier supports the C9X standard
#   __func__ indentifier.
#
#   The new C9X standard for the C language stipulates that the
#   identifier __func__ shall be implictly declared by the compiler as
#   if, immediately following the opening brace of each function
#   definition, the declaration
#
#       static const char __func__[] = "function-name";
#
#   appeared, where function-name is the name of the function where the
#   __func__ identifier is used.
#
# LAST MODIFICATION
#
#   2000-07-19
#
# COPYLEFT
#
#   Copyright (c) 2000 Christopher Currie <christopher@currie.com>
#
#   This program is free software; you can redistribute it and/or
#   modify it under the terms of the GNU General Public License as
#   published by the Free Software Foundation; either version 2 of the
#   License, or (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#   General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#   02111-1307, USA.
#
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#   owner gives unlimited permission to copy, distribute and modify the
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AC_DEFUN([AC_C_VAR_FUNC],
[AC_REQUIRE([AC_PROG_CC])
AC_CACHE_CHECK(whether $CC recognizes __func__, ac_cv_c_var_func,
AC_TRY_COMPILE(,
[int main() {
char *s = __func__;
}],
AC_DEFINE(HAVE_FUNC,,
[Define if the C complier supports __func__]) ac_cv_c_var_func=yes,
ac_cv_c_var_func=no) )
])dnl