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From: Eric Botcazou <botcazou@adacore.com>
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To: Richard Biener <richard.guenther@gmail.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] Use default lower bound for vector types in debug info
Date: Mon, 04 Jul 2022 10:42:36 +0200
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> For late generated vector types this might result in inconsistencies with
> early (user) generated types when using LTO.

Is that a problem?  That's no different with regular array types.

> Is there context available somehow so we can do like the is_<LANG> overloads
> on a decl and use a default according to that?

Not sure, the only safe thing to do would be to return -1 as the default lower 
bound if flag_generate_lto.

-- 
Eric Botcazou