https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127951
Bug ID: 127951
Summary: fails to bootstrap with PGO+LTO on native x32,
segfault in liblto_plugin.so
Product: gcc
Version: 16.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: givemeagoodun at gmail dot com
Target Milestone: ---
Created attachment 65877
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65877&action=edit
GCC build logs
Initially reported on https://bugs.gentoo.org/984074
GCC fails to build with LTO+PGO on gnux32 due to a potential miscompilation in
liblto.so. SIGSEGV on the entry to function claim_file_handler_v2() in
lto-plugin.c.
It does not occur without LTO, without PGO, or without either; only when
they're combined.
It is present in the latest master branch as of a few days ago, tested on a
fresh Gentoo x32 rootfs.
Reproducible with "ACCEPT_KEYWORDS='**' USE='lto pgo vanilla' emerge
=sys-devel/gcc-16.3.9999"
It is also present in 16.2.1_p20260926.
