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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97172

--- Comment #14 from Martin Sebor <msebor at gcc dot gnu.org> ---
I submitted a simple patch to do the unsharing as the first step toward fix=
ing
this bug here:
https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559770.html

I'm not sure I understand correctly what you mean by "avoiding the attribute
for VLA types would likely also be good (are those handled in any reasonable
way?)"  As I explain in the thread at the link above, the attribute is stri=
ctly
only strictly necessary for the most significant bound of a VLA parameter. =
 The
other bounds are encoded in the type and so don't also need to be duplicate=
d in
the attribute (it's just more convenient/faster that way).  But even with t=
hat
change,  and with the unsharing (or with the SAVE_EXPR around it), I'd expe=
ct
the most significant bound to still be a problem for the streamer since it =
will
still contain the unsupported nodes.  Not SSA_NAMEs but some of the others.=