Re: --with-llvm on 32-bit platforms?

Peter Eisentraut wrote 2025-09-15 09:36:
> On 05.09.25 13:32, Dmitry Mityugov wrote:
>> Dmitry Mityugov писал(а) 2025-09-05 11:11:
>>> Dmitry Mityugov писал(а) 2025-09-05 00:32:
>>>> It seems that when I add --with-llvm flag to ./configure on any 32- 
>>>> bit platform that I have (Debian 12, Debian 13, Arch Linux), many 
>>>> tests invoked by `make check` fail, or, sometimes, hang forever. Is 
>>>> this a known problem? It's not critical to me, just wanted to know 
>>>> if I should abandon --with-llvm forever on such platforms. On 64-bit 
>>>> Linux platforms, both x86 and ARM, --with-llvm works fine.
>>>> 
>>>> To reproduce, it's enough to:
>>>> 
>>>> make distclean
>>>> ./configure --with-llvm
>>>> make -j23 -ks
>>>> make check
>>>> 
>>>> The last step is never successful to me, and, by the way, this can 
>>>> also be reproduced with clang:
>>>> 
>>>> make distclean
>>>> ./configure CC=clang CXX=clang++ --with-llvm CFLAGS=-msse2
>>>> make -j23 -ks
>>>> make check
>>>> 
>>>> Thanks in advance for your attention to this problem, or telling me 
>>>> this is not a problem at all
>>> 
>>> One of the reasons I ask this question is that according to 
>>> f5d07085822a1 parameter --with-llvm is now mandatory in some cases, 
>>> but it seems it can't be used.
>> 
>> By the way, when I rebuild REL_17_STABLE using the steps above (on 
>> Debian 13 32-bit is this matters) tests in `make check` pass, so it 
>> seems that something is broken in master.
> 
> It seems plausible that this is related to commit 2a600a93c7b "Make 
> type Datum be 8 bytes wide everywhere.".  I don't have any more 
> insights than that.

Thanks for the hint. I did git bisect, and it seems that the first ‘bad’ 
commit is this:

commit 2a600a93c7be5b0bf8cacb1af78009db12bc4857
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date:   Wed Aug 13 16:35:06 2025 -0400

    Make type Datum be 8 bytes wide everywhere.
    …

I'll try to look further to understand what particular change in this 
commit is responsible for the problem.

Thank you again