Re: disallow big-endian on aarch64

On 02.10.25 23:31, Nathan Bossart wrote:
> On Thu, Oct 02, 2025 at 05:08:42PM -0400, Tom Lane wrote:
>> Nathan Bossart<nathandbossart@gmail.com> writes:
>>> The benefit is that we can safely assume little-endian in AAarch64-specific
>>> code, and on the off-chance that someone tries to build Postgres in an
>>> AArch64/big-endian environment, we aren't pretending to support it.
>> Is that actually a meaningful benefit, ie can we remove any code
>> anywhere?
> I'm not aware of existing code that is broken, but some of the stuff I'm
> intending to commit soon to optimize hex_{encode,decode} might be sensitive
> to endianness.  In any case, I don't think it's outside the realm of
> possibilities for architecture-specific code.

As a future direction, in cases like this I think it would be better to 
write a static assertion.  Then the check is self-contained in the C 
code, perhaps next to the code it's trying to protect, perhaps with a 
comment, and doesn't have to be maintained in some far-away configure 
shell script.