On Sat, Nov 28, 2015 at 04:05:30PM +0000, Joseph Myers wrote:
> On Sat, 28 Nov 2015, Richard Biener wrote:
>
> > Different approach: after the FE folds (unexpectedly?), scan the result
> > for SAVE_EXPRs and if found, drop the folding.
>
> Or, if conversions are going to fold from language-independent code (which
> is the underlying problem here - a conversion without folding would be
> preferred once the fallout from that can be resolved), make the front end
> fold with c_fully_fold before doing the conversion, and wrap the result of
> the conversion in a C_MAYBE_CONST_EXPR with c_wrap_maybe_const in the same
> way as done in other places that fold early (if either c_fully_fold
> indicates it can't occur in a constant expression, or the result of
> folding / conversion is not an INTEGER_CST).
Unfortunately, even this doesn't seem to work :(; I'm getting leaked
C_MAYBE_CONST_EXPRs e.g. when converting to (_Complex float), and a bunch of
missing warnings resulting in big testsuite fallout.
Marek
