On Thu, Apr 25, 2019 at 01:39:02PM +0200, Richard Biener wrote:
> > Regtested on x86_64-linux and i686-linux, ok for trunk?
>
> The patch would be obvious but I wonder how the above can change
> anything... (but I can reproduce with even only that change)
Haven't stepped through it in a debugger, but I bet it is the
fold_non_dependent_expr call in null_ptr_cst_p which is done for C++98 only.
That will mark it as TREE_USED in the end most likely and the
earlier fix for the PR44648 issues, r249083, was also about not trying to
fold the stuff early.
> > 2019-04-25 Jakub Jelinek <ja...@redhat.com>
> >
> > PR c++/44648
> > * g++.dg/warn/Wunused-var-35.C: Remove xfail.
> >
> > --- gcc/testsuite/g++.dg/warn/Wunused-var-35.C.jj 2019-02-04
> > 09:44:31.365413407 +0100
> > +++ gcc/testsuite/g++.dg/warn/Wunused-var-35.C 2019-04-25
> > 13:24:49.717065815 +0200
> > @@ -11,9 +11,8 @@ int main()
> > else
> > return 1;
> >
> > - if (const bool b2 = 1) // { dg-warning "\\\[-Wunused-variable\\\]" "bug"
> > { xfail c++98_only } }
> > + if (const bool b2 = 1) // { dg-warning "\\\[-Wunused-variable\\\]" }
> > return 0;
> > else
> > return 1;
> > }
> > -
Jakub
