C++ PATCH to anonymous namespace visibility for c++/21581

[Jason Merrill]

This patch implements the request for names in anonymous namespace to 
have hidden visibility by default.  We may want to change that when we 
implement export, but any affected code will need to be recompiled 
anyway so it doesn't hurt to do this optimization while we can.

Tested x86_64-pc-linux-gnu, applied to trunk.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: anon-vis.patch
Type: text/x-patch
Size: 3056 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20060321/50ef87a8/attachment.bin>