c++: typedef for linkage [PR 99208]

Unnamed types with a typedef name for linkage were always troublesome
in modules.  This is the underlying cause of that trouble -- we were
creating incorrect type structures.  Classes have an implicit
self-reference, and we created that for unnamed classes too.  It turns
out we make use of this member, so just not generating it turned into
a rathole.  This member is created using the anonymous name -- because
we've not yet met the typedef name.  When we retrofit the typedef name
we were checking identifier matching and changing all type variants
with that identifier.  Which meant we ended up with a strange typedef
for the self reference.  This fixes things to check for DECL identity
of the variants, so we don't smash the self-reference -- that
continues to have the anonymous name.

	PR c++/99208
	gcc/cp/
	* decl.c (name_unnamed_type): Check DECL identity, not IDENTIFIER
	identity.
	gcc/testsuite/
	* g++.dg/modules/pr99208_a.C: New.
	* g++.dg/modules/pr99208_b.C: New.

0 files changed, 0 insertions, 0 deletions