Bug#838613: perl: FTBFS on hppa - ext/XS-APItest/t/customop FAILED

[Niko Tyni]

On Sun, Sep 25, 2016 at 03:30:45PM -0400, John David Anglin wrote:
> On 2016-09-25, at 4:09 AM, Niko Tyni wrote:
> 
> > - building with gcc-5 or at -O0 makes it go away
> > - I've bisected with gcc #pragmas that disabling optimization for just
> >  Perl_custom_op_register() in op.c makes it go away
> > - I haven't managed to find which specific optimization causes it
> 
> Attached is the diff in assembly output for Perl_custom_op_register compiled with gcc-5 and gcc-6,
> respectively.  This is with 5.22.2 which I happened to have handy.
> 
> The differences are just label changes and I don't see any functional difference in the assembly.

That's a bit weird. Presumably then the relevant difference in generated
code between gcc versions is somewhere else, and the optimized version
of Perl_custom_op_register() only breaks with the gcc 6 generated code.

Anyway, I'm attaching a workaround patch that just lowers the optimization
of op.c. I've verified that the test suite passes with this.

We'll include this in the next perl upload unless somebody objects.
-- 
Niko Tyni   ntyni at debian.org
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