[C++ Patch] PR 57734

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

this issue points out that we aren't handling correctly alias template 
declarations of enums. The core problem in lookup_template_class_1 is 
easy to spot: we check for (and handle) TREE_CODE (template_type) == 
ENUMERAL_TYPE *before* DECL_ALIAS_TEMPLATE_P (gen_tmpl). Besides this 
more or less straightforward change, in the patchlet I also have to 
avoid calling tsubst_enum (otherwise we immediately have duplicate 
declarations for the enumerators of unscoped enums, and all sorts of 
troubles: I tried to cover in the extended testcase some of the weird 
things I was seeing earlier today ;) Tested x86_64-linux.

Thanks!
Paolo.

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Attachment: patch_57734
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