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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95264] Infinite Loop When Compiling Templated C++ code at
 -O1 and above
Date: Fri, 22 May 2020 09:35:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95264

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're then inlining some more costing another ~5GB ontop of the early
optimization memory use of ~5GB (might be other IPA transforms than inlining
as well).  The big function is meanwhile 2 million basic blocks...
update-SSA and friends are no fun here (the function with 2 million BBs is
eval_orthob).

Ah, you use [[gnu::flatten]] on that - so isn't it just what you asked for?

I wonder if Clang implements that at all.

Note the issue with -fvar-tracking* and -g and large functions is known...=