On 1/12/21 9:13 PM, Marek Polacek wrote:
Another ICE with delayed noexcept parsing, but a bit gnarlier.
A function definition marked with __attribute__((used)) ought to be
emitted even when it is not referenced in a TU. For a member function
template marked with __attribute__((used)) this means that it will
be instantiated: in instantiate_class_template_1 we have
11971 /* Instantiate members marked with attribute used. */
11972 if (r != error_mark_node && DECL_PRESERVE_P (r))
11973 mark_used (r);
It is not so surprising that this doesn't work well with delayed
noexcept parsing: when we're processing the function template we delay
the parsing, so the member "foo" is found, but then when we're
instantiating it, "foo" hasn't yet been seen, which creates a
discrepancy and a crash ensues. "foo" hasn't yet been seen because
instantiate_class_template_1 just loops over the class members and
instantiates right away.
That seems like the bug; we shouldn't instantiate any members until
we're done instantiating the class.
Jason
