this should be fixed by https://trac.sagemath.org/ticket/23225
please review

On Monday, June 12, 2017 at 1:44:58 PM UTC+1, tsc...@ucdavis.edu wrote:
>
>
>
> On Sunday, June 11, 2017 at 11:45:57 PM UTC-5, François wrote:
>>
>> On 12/06/17 16:20, tsc...@ucdavis.edu 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. 
>>
>>
> I tried reverting #18882, but it didn't seem to work. Yet, I didn't delete 
> the partial install so that might have contributed. I will try again. I 
> also looked at my old build logs and it seems that tuning is the default 
> option as far back as at least 7.6.beta2.
>
> Best,
> Travis
>
>

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