Re: regression on zOS between 5.4.8 to 5.5.0 on zOS

On Fri, Feb 6, 2026 at 3:26 PM gottfried leibniz
<[email protected]> wrote:
>
> On 2/4/2026 7:10 AM, Eric Covener wrote:
> > Big endian is the obvious one but it shares that with AIX which is unaffected.
> > I have also seen warnings that "strict aliasing" is rather
> > strict/aggressive on zOS / xlc.
> >
>
> What z/OS compiler is being used here? In your debug output, one of the
> OP_GETTABUP instructions [1] looks different when compiling the included
> example on other machines (RA_Raw *should* be 4).

Thanks so much Gottfried!

We are on the old/traditional native xlc. Our HTTPD (+prereqs) port is
somewhat old (~2005), so we are not using any of the more modern
porting-friendly compilers or options.

> If you are building Lua from the release page, would it be possible to
> generate and provide the compiler listing, e.g., ./luac -l -l -p $FILE
> (It may also be helpful to include both 5.5 and 5.4.8).

I've uploaded the two listings to the gist
https://gist.github.com/covener/4412c8be7762916335bb05e1d8171511

Thanks again!

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