C++ PATCH: PR 20599 (variadic templates, take two) (2/4)

[Douglas Gregor]

This patch addresses PR c++/20599 by introducing support for variadic
templates:

        http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20599

This is a revised version of the patch posted previously. It  
addresses several bugs in the original patch and includes changes to  
libstdc++ that use variadic templates for the implementation of  
Library TR1 tuples and function objects. In particular, the changes  
from the first patch are:
	- Warn about variadic templates by default; -Wno-variadic-templates  
turns off this warning.
	- Support printing parameter packs in function types (for error  
messages)
	- Support for nested expansion of parameter packs.
	- Tighter error checking.

More information about variadic templates is available here:

        http://www.generic-programming.org/~dgregor/cpp/variadic- 
templates.html

This is part 2 of 4. It contains all of the command-line option  
handling and documentation.

Tested on mainline with powerpc-apply-darwin8.7.0 and i686-pc-linux- 
gnu; no new regressions. All new tests pass.

	Doug Gregor
	Open Systems Lab @ Indiana University

2006-09-19	Douglas Gregor <doug.gregor@gmail.com>

	PR c++/20599
	* c-common.c (warn_variadic_templates): New.
	* c-common.h (warn_variadic_templates): Declare.
	* c-cppbuiltin.c (c_cpp_builtins): Define __VARIADIC_TEMPLATES
	when we aren't complaining about them.
	* c-opts.c (c_common_handle_option): Handle
	-W(no-)variadic-templates.
	(c_common_post_options): By default, do warn about variadic
	templates.
	* c.opt: Add -W(no-)variadic templates.
	* doc/cpp.texi: Document __VARIADIC_TEMPLATES macro.
	* doc/invoke.texi: Document -W(no-)variadic-templates.

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