I would like to still get hold of the information that used to be present at that page because they were in fact very useful.
This is what web search engines are for. Going to yahoo, typing gcc visibility, and then clicking on the "cached" link for the first search result, I get a copy of the page.
http://216.109.117.135/search/cache?p=gcc+visibility&sm=Yahoo%21+Search&toggle=1&ei=UTF-8&u=www.nedprod.com/programs/gccvisibility.html&w=gcc+visibility&d=C31F2BCCE8&icp=1&.intl=us
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Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com