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From: "a.heider at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/108630] New: build failure with LTO enabled
Date: Wed, 01 Feb 2023 13:06:41 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 12.2.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: a.heider at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108630

            Bug ID: 108630
           Summary: build failure with LTO enabled
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: a.heider at gmail dot com
  Target Milestone: ---

This is happening when attempting to build a cross compiler with:
CFLAGS_FOR_TARGET=3D"-flto=3Dauto -ffat-lto-objects"
LDFLAGS_FOR_TARGET=3D"-flto=3Dauto -fuse-linker-plugin"

The assembler errors out when building libstdc++ with:
Error: invalid attempt to declare external version name as default in symbol
`_ZNSt19istreambuf_iteratorIcSt11char_traitsIcEEppEv@@GLIBCXX_3.4.5'

The build succeed when building with an additional --enable-symvers=3Dno on=
 top.

libstdc++ may need the same treatment as seen e.g. here:
https://sourceware.org/git/?p=3Dbinutils-gdb.git;a=3Dcommitdiff;h=3Df4be268=
38dc9937a4ae3e9cf4fbec50efd7786a2=