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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/99849] ICE in expand_expr_real_1, at expr.c:11556 since
 r5-5407-g30d5d8c5189064c8
Date: Thu, 01 Apr 2021 06:56:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99849

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're outputting the initializer of mlx5_ib_object_MLX5_IB_OBJECT_VAR which
looks like

{.cleanup=3D&<<< Unknown tree: compound_literal_expr
    extern const struct uverbs_obj_idr_type __compound_literal.0 =3D
{.type=3D{.type_class=3D&uverbs_idr_class}}; >>>.type}

The DECL_RTL of the COMPOUND_LITERAL_EXPR_DECL decl is

(mem/u/c:DI (symbol_ref:DI ("__compound_literal.0.lto_priv.0") [flags 0x42]
<var_decl 0x7ffff637a000 __compound_literal.0>) [7 __compound_literal.0+0 S8
A64])

The issue is that while we handle ADDR_EXPR of COMPOUND_LITERAL_EXPR specia=
lly
in a lot of places here we have it wrapped in a COMPONENT_REF.

It somehow feels that some lowering is missing - it would be interesting to
trace the non-LTO compile of this initializer.=