Re: [lmi] Fwd: How did this unit test fail?

[Vadim Zeitlin]

On Wed, 28 Mar 2018 12:27:18 +0000 Greg Chicares <address@hidden> wrote:

GC> On 2018-03-27 11:50, Vadim Zeitlin wrote:
GC> [...]
GC> >  So this is clearly a bug in gcc, although I don't know if it's a "real"
GC> > bug or some weird miscompilation of Debian MinGW package or a result of 
one
GC> > of Debian patches -- although I don't see anything remotely relevant in
GC> > 
https://anonscm.debian.org/cgit/collab-maint/gcc-mingw-w64.git/tree/debian/patches
GC> 
GC> I read all of them, and it seems like the problem must be this patch:
GC> 
GC> 
https://anonscm.debian.org/cgit/collab-maint/gcc-mingw-w64.git/tree/debian/patches/cpp-intrinsics.patch

 Sorry, I should have saved you the trouble by forwarding the reply I got
from Stephen Kitt, who maintains gcc-mingw-w64 package in Debian, which
pointed out that gcc-mingw-w64 also inherits Debian-specific patches to gcc
itself, so the culprit could also be any of the patches here:

https://anonscm.debian.org/viewvc/gcccvs/branches/sid/gcc-7/debian/patches/

and this seems much more likely to be the case, as the problem can also be
reproduced (albeit in a different way) with the native compiler too, i.e.
it's not MinGW-w64-specific. Unfortunately the latter URL has way too many
patches to read all of them...

 In any case, everything points to the problem being Debian-specific, so
I've now created https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=894302
for it too.

GC> >  For now I've opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85091 
but
GC> > I'm not sure if anybody is going to look at it, the bug report seems far
GC> > too crazy to be real
GC> 
GC> Already thirty-one comments, the last of which says:
GC> | It's super-weird issue

 Yes, apparently this bug report has crossed the weirdness threshold and
became actually intriguing enough to attract people's attention. Let's see
if it works with Debian maintainers too...

 Regards,
VZ