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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_old_for_scoping.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_OLD_FOR_SCOPING
#
# DESCRIPTION
#
# If the compiler accepts the old for scoping rules (the scope of a
# variable declared inside the parentheses extends outside the for-body),
# define HAVE_OLD_FOR_SCOPING. Note that some compilers (notably g++ and
# egcs) support both new and old rules since they accept the old rules and
# only generate a warning.
#
# 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 8
AU_ALIAS([AC_CXX_OLD_FOR_SCOPING], [AX_CXX_OLD_FOR_SCOPING])
AC_DEFUN([AX_CXX_OLD_FOR_SCOPING],
[AC_CACHE_CHECK(whether the compiler accepts the old for scoping rules,
ax_cv_cxx_old_for_scoping,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[int z;for (int i=0; i < 10; ++i)z=z+i;z=i;return z;]])],
[ax_cv_cxx_old_for_scoping=yes], [ax_cv_cxx_old_for_scoping=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_old_for_scoping" = yes; then
AC_DEFINE(HAVE_OLD_FOR_SCOPING,,[define if the compiler accepts the old for scoping rules])
fi
])
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