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GMP transition: 4.3.2 to 5.0.1?


Now that squeeze is out, I'd like to move from GMP 4 to GMP 5.  The
latter was released upstream about a year ago and the gmp lists
aren't buzzing with outrageous bugs, so it appears stable enough.

I know GMP is used in gcc itself, so I'd appreciate some guidance
from the gcc team as well, since this is a major version change.

I uploaded GMP 5 to experimental last year and it builds fine with two
exceptions: hppa is BD-Uninstallable (?) and ia64 fails to build with
an ICE.  The underlying cause is already known [1] and from reading
the bug report I suspect I may be able to work around this by building
one file with -O2 rather than -O3.  Other suggestions welcome.

Main question: should I go ahead and upload the new version when
I get a free moment or do we need more investigation?

[1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43603


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