On 12/06/17 16:20, [email protected] wrote:

    Given what I see, you only get this when you set SAGE_TUNE_GF2X=full.
    Unsetting SAGE_TUNE_GF2X (which is the default) or putting it to no
    will work. At least it looks to me like SAGE_TUNE_GF2X is set to full
    from the log, let me know if this assumption is wrong.

I didn't set SAGE_TUNE_GF2X, but it still attempted the tuning even with it unset. However, it built fine when I did export SAGE_TUNE_GF2X=no.


There are 3 levels of tuning for gf2x in the sage spkg:
no) no tuning
full) full tuning
*) default if unset.

I thought it was only happening on full. But obviously I am wrong.
The fix must have exposed a further bug that was more prevalent
than I thought.
On my machine I have no problem doing a default tuning or a full
tuning with both gcc and clang. And the test suite passes in full
in all configurations.

But given how widespread this is turning out to be, we would be
better reverting https://trac.sagemath.org/ticket/18882 and
wait for the new release of gf2x. The changes on git master are
big enough that cherry-picking is a difficult option, and the
tuning is massively faster.

Francois

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