Bug#671866: gmp: causes gcc ICEs on amd64 and kfreebsd-amd64
Steve M. Robbins
steve at sumost.ca
Wed May 9 05:59:43 CEST 2012
On Tue, May 08, 2012 at 10:44:57AM +0200, Torbjorn Granlund wrote:
> "Steve M. Robbins" <steve at sumost.ca> writes:
> Interesting. It could well be the configure option. For the past 6
> years, Debian built using --disable-fat on amd64. I changed it
> because there are both bug workarounds and code speedups that are
> Changed it to --disable-fat a couple of years ago with that aim, or
> changed it away from --disable-fat now with that aim?
The latter. I changed it this weekend TO --enable-fat with the aim to
take advantage of the run-time processor detection.
> If you are aware of any bugs that will exist only in fat or only in
> non-fat GMP builds, the GMP project would like to know about that.
What we have learned in this bug thread is this: when built with
--enable-fat on an amd64 machine and then run on an amd64 *virtual*
machine, the GMP shared lib causes an internal compiler error when gcc
compiles a simple file.
> No idea why your emulator doesn't emulate hardware to GMP's
> satisfaction. Some instruction is probably not emulated correctly.
> I've seen cases where emulators claim 64-bittyness and non-64-bittyness
> at the same time (such as 486 with AMD64 insns), and even had suggested
> patch to GMP a while ago with a workaround...
Agreed that we still don't know whether there is a bug in GMP or in
the emulator. I hope the others will chime in with details of the
Torbjorn: which emulator caused a problem for GMP in the past? What
was the symptom? How does the run-time detection get confused by it?
Was the GMP patch applied?
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