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From: "immoloism at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/106943] New: GCC building clang/llvm with LTO flags causes
 ICE in clang
Date: Wed, 14 Sep 2022 17:39:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106943

            Bug ID: 106943
           Summary: GCC building clang/llvm with LTO flags causes ICE in
                    clang
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: immoloism at googlemail dot com
  Target Milestone: ---

Created attachment 53574
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D53574&action=3Dedit
ICE error

I've found an interesting ICE which only occurs when LTO flags are turned o=
n in
GCC while building clang and llvm while compiling compiler-rt-sanitizers. I=
f I
rebuild clang/llvm without the flto cflags then the bug does not appear.

CFLAGS used to build clang/llvm "-march=3Dnative -O2 -pipe -fgraphite-ident=
ity
-floop-nest-optimize -flto=3D8 -fuse-linker-plugin -falign-functions=3D32"

This is the first time I've run into anything like this so please ask if any
other files or tests will help you identify the cause and I'd be happy to
oblige.

I have reported this to the LLVM team and they believe this could be an iss=
ue
your end so hopefully you have some ideas to add.=