[Bug middle-end/64498] [5 Regression] Cannot build Firefox with LTO: ICE in substitute_and_fold_dom_walker::before_dom_children

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64498

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Priority|P3                          |P1

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> If the final result is -g0, then clearing flag_var_tracking_assignments is
> desirable, if the final result is -g and any of the inputs have debug stmts,
> then either you need to turn flag_var_tracking_assignments whenever any
> inputs
> has debug stmts, or remove the debug stmts if you want to keep it cleared.

I think this will properly happen when removing flag_var_tracking_assignments
from Optimization.  The streamer drops all debug stmts at stream-in time
according to global flags.