[Pkg-pascal-devel] Attempted Install on aarch64 gives "Invalid floating point operation"

[Abou Al Montacir]

Hi Peter,

On Sat, 2021-11-13 at 16:58 +0000, Peter Blackman wrote:
> Building C-evo on the Open Build Service, sometimes gives a weird error...
> https://build.opensuse.org/package/live_build_log/home:PeterBBB/c-evo/Debian_11/aarch64
>  
> <https://build.opensuse.org/package/live_build_log/home:PeterBBB/c-evo/Debian_11/aarch64
> >
> 
> 
> ....
> [  124s] [302/432] *installing fp-compiler*-3.2.0-3.2.0+dfsg-12
> [  125s] An unhandled exception occurred at $0000000000470960:
> [  125s] EInvalidOp: *Invalid floating point operation*
> [  125s]   $0000000000470960
> [  125s]   $0000000000472FC0
> ....
> 
> The problem is intermittent, sometime the aarch64 build succeeds. Builds for
> Bullseye OK on all other architectures.
Many programs build using FPC seem to have build/execution errors with new FPC
3.2.2 release. It seems that 3.2.2 is less stable for some architectures than
3.2.0. However, we are still hunting some minimal programs that show
regressions.
> 
> Floating Point error on an install seems bizarre to me.
It may be the result of the above mentioned instability of 3.2.2. However we
need probably to understand what leads to that before we can raise a compiler
bug.
> 
> Anyone have any ideas on this?  Is it worth raising a bug report?
As I said, it may be a compiler bug, but we will need to have a small program
reproducing it if we want upstream to handle it.
> 
> On the basis of a very low sample, this problem seems occur around 50% of the
> time.
Until now, mode issues where perfectly reproducible, maybe this is an other one,
or maybe related to a non initialized floating point coprocessor register that
gets in the way and leads to an invalid floating point operation
-- 
Cheers,
Abou Al Montacir

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