/usr/share/aclocal/ax_gcc_libsupcxx.m4 is in autoconf-archive 20160916-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# http://www.gnu.org/software/autoconf-archive/ax_gcc_libsupcxx.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_GCC_LIBSUPCXX(VARIABLE)
#
# DESCRIPTION
#
# AX_GCC_LIBSUPCXX defines VARIABLE as the absolute path to libsupc++.a if
# it is available on the system, empty otherwise.
#
# LICENSE
#
# Copyright (c) 2009 Francesco Salvestrini <salvestrini@users.sourceforge.net>
# Copyright (c) 2009 Alessandro Massignan <ff0000.it@gmail.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, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
#serial 7
AC_DEFUN([AX_GCC_LIBSUPCXX], [
AX_GCC_LIBRARIES_DIR([GCC_LIBRARIES_DIR])
AS_IF([test -z "$GCC_LIBRARIES_DIR"],[
AC_MSG_ERROR([problems detecting gcc libraries dir])
])
AC_MSG_CHECKING([for libsupc++.a])
ax_gcc_libraries_dir_IFS=$IFS
IFS=":"
$1=""
for i in $GCC_LIBRARIES_DIR
do
AS_IF([test -f "$i/libsupc++.a"],[
IFS=$ax_gcc_libraries_dir_IFS
$1="$i/libsupc++.a"
break
])
done
IFS=$ax_gcc_libraries_dir_IFS
AC_MSG_RESULT([$$1])
])
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