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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug go/100537] Bootstrap-O3 and bootstrap-debug fail on 32-bit ARM
 after gcc-12-657-ga076632e274a
Date: Wed, 12 May 2021 06:49:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100537

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cmang at google dot com,
                   |                            |iant at google dot com
           Assignee|unassigned at gcc dot gnu.org      |ian at airs dot com
          Component|middle-end                  |go

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
So the issue is that the go FE creates go..C479 and it somewhere builds the
address of it but fails to set TREE_ADDRESSABLE.  There are only a few
build_fold_addr_expr calls in the FE:

> grep  -r build_fold_addr  .
./go-gcc.cc:  tree t =3D build_fold_addr_expr_loc(location.gcc_location(),
this->t_);
./go-gcc.cc:  tree ret =3D build_fold_addr_expr_loc(location.gcc_location(),
func);
./go-gcc.cc:  tree ret =3D build_fold_addr_expr_loc(location.gcc_location(),
expr);
./go-gcc.cc:          fn =3D build_fold_addr_expr_loc(location.gcc_location=
(),
./go-gcc.cc:=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20
build_fold_addr_expr_loc(location.gcc_location(),

one does mark the object addressable but all the others do not.  So for
those who can reproduce, run the failing compile in a debugger, see
which ADDR_EXPR we complain about and then set a breakpoint in
ggc_internal_alloc conditional on the return value being this ADDR_EXPR.

That should nail one of the above after which you should call
mark_addressable on the object.=