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From: "ohaiziejohwahkeezuoz at xff dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/99898] New: Possible LTO object incompatibility on gcc-10
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Date: Sat, 03 Apr 2021 16:20:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99898

            Bug ID: 99898
           Summary: Possible LTO object incompatibility on gcc-10 branch
           Product: gcc
           Version: 10.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ohaiziejohwahkeezuoz at xff dot cz
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

I'm trying gcc (releases/gcc-10 branch with the last commit  Fri Oct 23
10:11:41 2020 +0200 - Fix up plugin header install)

And I'm seeing an ICE cross-compiling glib library when linking with=20

i686-linux-musl-gcc  -o gio/gresource gio/gresource.p/gresource-tool.c.o
-L/workspace/megous.com/apps-c/static-deps/output/i686/sys/usr/lib
-Wl,--as-needed -Wl,--no-undefined -Wl,-O1 -static -Wl,--start-group
gio/libgio-2.0.a glib/libglib-2.0.a gobject/libgobject-2.0.a
gmodule/libgmodule-2.0.a
/workspace/megous.com/apps-c/static-deps/output/i686/sys/usr/lib/libz.a
/workspace/megous.com/apps-c/static-deps/output/i686/sys/usr/lib/libmount.a
/workspace/megous.com/apps-c/static-deps/output/i686/sys/usr/lib/libblkid.a
-pthread -liconv -lm
/workspace/megous.com/apps-c/static-deps/output/i686/sys/usr/lib/libffi.a
-Wl,--end-group
lto1: internal compiler error: in lto_read_decls, at lto/lto-common.c:1956
Please submit a full bug report,
with preprocessed source if appropriate.

I'm compiling with fat LTO objects, and this only happens when mixing LTO
object files compiled with previous version of gcc on the tip of gcc-10 bra=
nch.
(and only with i686 target so far) Sorry I don't have precise version of the
previous compiler, but it was probably something close to 10.2 judging by t=
he
dates on the object files.

Recompiling all dependencies with the same version of the compiler doesn't =
lead
to this ICE.

Maybe LTO version needs a bump prior to 10.3 release?=