Re: [PING] fallocate() causes btrfs to never compress postgresql files

On 2026-02-06 Fr 10:11 AM, Tom Lane wrote:
> Thomas Munro <thomas.munro@gmail.com> writes:
>> BTW the rest of the patches will reemerge for master, but for the
>> minimal one back-patched: crake complains about an ABI break due to
>> GUC table changes.  Of course adding a GUC to the stable branches is
>> unusual and we discussed the need for it in this case.  Is that
>> expected?  In what way is it part of the ABI?  How would one determine
>> in advance that the ABI checker will complain?
> We have very little experience so far with libabigail, so there's
> not any store of knowledge hereabouts on what it'll complain about.
>
> The message is complaining that sizeof(ConfigureNamesEnum) changed,
> which it did, but I don't see how that value would be visible to
> external modules.  So maybe a bug in libabigail?
>
>             



I guess because of this in guc_tables.h:


extern PGDLLIMPORT struct config_generic ConfigureNames[];


cheers


andrew


--
Andrew Dunstan
EDB: https://www.enterprisedb.com