C++ PATCH: fix PR 28786 - dynamic_cast<void*>, v2

[Benjamin Smedberg]

Benjamin Smedberg wrote:
> Patch updated per Mark Mitchell's comments: use @code{} in 
> documentation. Also fixed a typo in the test s/do-do/dg-do/

My email client is munging tabs, so I've attached the patch instead of 
putting it inline.

:ADDPATCH C++:

--BDS

2006-08-11   Benjamin Smedberg <benjamin@smedbergs.us>

     PR c++/28687
     * doc/invoke.texi (-no-rtti): specifically document
     dynamic_cast<void*>

cp/
2006-08-11   Benjamin Smedberg <benjamin@smedbergs.us>

     PR c++/28687
     * rtti.c (build_dynamic_cast, build_dynamic_cast_1):
     Move -fno-rtti check to be more specific


testsuite/
2006-08-11   Benjamin Smedberg <benjamin@smedbergs.us>

     PR c++/28687
     * g++.dg/rtti/no-rtti-voidptr.C: new
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