Re: OCaml 5.2 rebuild

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Sorry for the silence.  I've been on vacation, returning to find a
giant pile of work waiting for me. :-)

On Thu, May 30, 2024 at 3:01 AM Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
> Since flocq seems to have no public bug tracker, I might as well write
> my findings here ...
>
> I believe the error is raised in this code:
>
> https://github.com/coq/coq/blob/ac1e5ebd3f50a53b46cdb59225887841f5d24d02/coqpp/coqpp_parser.ml#L36
>
> I had a lot of trouble getting gdb to understand /usr/bin/coqc.  Is it
> even a native code binary?  As I couldn't place a breakpoint, I
> trapped on write system calls to fd=2, but no useful stack trace was
> forthcoming.  I wonder if it's even a real stack overflow or some
> stack inside the parser?
>
> However I did observe that /usr/bin/coqc.byte does not have the same
> problem (so perhaps it is the real stack).  I added this very ugly
> workaround to get it to compile:
>
> https://src.fedoraproject.org/rpms/flocq/c/c46c3bb8222dca716316841514ce91e864b83b13?branch=rawhide
>
> Also of note: OCaml 5.2 re-enables the ppc64le native code generator,
> which was previously disabled since OCaml 5, so perhaps this is a new
> bug in the OCaml compiler?

That would be my suspicion.  I recently talked to OCaml upstream about
a ppc64le code generation bug that I tripped over while attempting to
update frama-c, and they mentioned that they were aware of a number of
ppc64le bugs in 5.2.0.  Hopefully 5.2.1 will sort many of them out.
-- 
Jerry James
http://www.jamezone.org/
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