/usr/share/aclocal/ax_cxx_rtti.m4 is in autoconf-archive 20131101-1.
This file is owned by root:root, with mode 0o644.
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# http://www.gnu.org/software/autoconf-archive/ax_cxx_rtti.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_RTTI
#
# DESCRIPTION
#
# If the compiler supports Run-Time Type Identification (typeinfo header
# and typeid keyword), define HAVE_RTTI.
#
# 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_RTTI], [AX_CXX_RTTI])
AC_DEFUN([AX_CXX_RTTI],
[AC_CACHE_CHECK(whether the compiler supports Run-Time Type Identification,
ax_cv_cxx_rtti,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([#include <typeinfo>
class Base { public :
Base () {}
virtual int f () { return 0; }
};
class Derived : public Base { public :
Derived () {}
virtual int f () { return 1; }
};
],[Derived d;
Base *ptr = &d;
return typeid (*ptr) == typeid (Derived);
],
ax_cv_cxx_rtti=yes, ax_cv_cxx_rtti=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_rtti" = yes; then
AC_DEFINE(HAVE_RTTI,,
[define if the compiler supports Run-Time Type Identification])
fi
])
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