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From: "jan.zizka at nokia dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106922] [12 Regression] Bogus uninitialized
 warning on boost::optional<<std::vector<std::string>>>, missed FRE
Date: Thu, 15 Sep 2022 22:13:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106922

--- Comment #10 from Jan =C5=BDi=C5=BEka <jan.zizka at nokia dot com> ---
Created attachment 53581
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53581&action=3Dedit
Second reproducer failing with 5edf02ed2b6de024f83a023d046a6a18f645bc83

I have cherry-picked the fix on top of gcc 12 and I confirm that my original
reproducer passes. But our production code still fails. I have created new
reproducer, the change is that the optional is inside a struct and seems th=
ere
need to be two elements. With first reproducer I have eliminated this
additional struct as that was also failing.

Please try with:

g++ -Werror -std=3Dc++20 -O2 -Wall -o reproduce1.o -c reproduce1.cpp=