Compatibility between gcc versions

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Is there a single page on http://gcc.gnu.org that
describes compatibility issues between versions of
gcc?  I noticed http://gcc.gnu.org/bugs.html#known
describes "Common problems updating from G++ 2.95 to
G++ 3.0", and http://gcc.gnu.org/gcc-3.2/changes.html
has some "Caveats", but is there a general page that
puts it all together?

Specifically, we use gcc2.9 and are wondering what's
the latest gcc we can upgrade to without having
compatibility problems with legacy modules that we
link in.  Our platforms are Solaris 2.[678], HP
10.10/11, Red Hat Linux 7.2.

Thanks!
 

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