[perl #121505] Can't build perl with gcc4.9 due to UB in sv.c

On Sun Apr 13 20:35:51 2014, tonyc wrote:
> On Thu Apr 10 00:03:05 2014, shay wrote:
> > On 10 April 2014 00:57, Tony Cook via RT <perlbug-followup@perl.org>
> > wrote:
> > > On Wed Apr 09 14:55:54 2014, tonyc wrote:
> > >> I still need to produce an update for win32/makefile.mk.
> > >
> > > Though op/numconvert.t doesn't fail, nor does any other relevant
> > > test, with 4.9.0 20140218.
> > >
> > > I don't really see a way to pick out a version in makefile.mk
> > > either,
> > > the only real solution I see is to always add it.
> > >
> >
> > Add a new CCTYPE, as is done for different MSVC++ versions? GCC49 or
> > GCC490 if you're using gcc-4.9.0 or higher?
> 
> Adding extra CCTYPE values means touching every place that looks at
> CCTYPE.
> 
> I tried to add GCCVERSION and then parse that using findstr, but it
> was unwieldly[1] and didn't work, since dmake treats the non-zero exit
> from findstr when it doesn't find the string as a build-time error.
> 
> I ended up adding a GCCWRAPV macro that can be overridden from the
> dmake command-line which enables -fwrapv by default.
> 
> This builds and tests ok with the gcc 4.7.3 included with the
> strawberry perl I have installed.
> 
> It builds perl successfully with a mingw gcc-4.9 snapshot, but I
> suspect testing would fail due to some strangeness in the built
> Errno.pm (the errno codes have l (lowercase L) suffixes.
> 
> For review/comment.
> 

I don't see any new attachment or smoke-me branch for review/comment. Am I missing something?

---
via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=121505

• [perl #121505] Can't build perl with gcc4.9 due to UB in sv.c by Steve Hay via RT
• Re: [perl #121505] Can't build perl with gcc4.9 due to UB in sv.c by Reini Urban