/usr/share/aclocal/ax_cxx_new_for_scoping.m4 is in autoconf-archive 20140228-1.1.
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_cxx_new_for_scoping.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_NEW_FOR_SCOPING
#
# DESCRIPTION
#
# If the compiler accepts the new for scoping rules (the scope of a
# variable declared inside the parentheses is restricted to the for-body),
# define HAVE_NEW_FOR_SCOPING.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 6
AU_ALIAS([AC_CXX_NEW_FOR_SCOPING], [AX_CXX_NEW_FOR_SCOPING])
AC_DEFUN([AX_CXX_NEW_FOR_SCOPING],
[AC_CACHE_CHECK(whether the compiler accepts the new for scoping rules,
ax_cv_cxx_new_for_scoping,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE(,[
int z = 0;
for (int i = 0; i < 10; ++i)
z = z + i;
for (int i = 0; i < 10; ++i)
z = z - i;
return z;],
ax_cv_cxx_new_for_scoping=yes, ax_cv_cxx_new_for_scoping=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_new_for_scoping" = yes; then
AC_DEFINE(HAVE_NEW_FOR_SCOPING,,[define if the compiler accepts the new for scoping rules])
fi
])
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