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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95638] Legit-looking code doesn't work with -O2
Date: Thu, 11 Jun 2020 12:23:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95638

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #2)
> The code works with -flifetime-dse=3D1, so I bet there's some object that=
 goes
> out of life:
> https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
> https://gcc.gnu.org/gcc-6/porting_to.html#flifetime-dse

The difference between -flifetime-dse=3D1 and the default is not in uses af=
ter
end of scope, but in relying on content being defined across start of the
constructor.=