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Subject: [Bug c/104506] [12 Regression] ICE: tree check: expected class
 'type', have 'exceptional' (error_mark) in useless_type_conversion_p, at
 gimple-expr.cc:87 on invalid symbol redeclaration
Date: Mon, 21 Feb 2022 09:06:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104506

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:e01530ec1e33f7df9c2acd0489d6d1f766cb1921

commit r12-7309-ge01530ec1e33f7df9c2acd0489d6d1f766cb1921
Author: Andrew Pinski <apinski@marvell.com>
Date:   Sun Feb 13 00:09:39 2022 +0000

    c: [PR104506] Fix ICE after error due to change of type to error_mark_n=
ode

    The problem here is we end up with an error_mark_node when calling
    useless_type_conversion_p and that ICEs. STRIP_NOPS/tree_nop_conversion
    has had a check for the inner type being an error_mark_node since
g9a6bb3f78c96
    (2000). This just adds the check also to tree_ssa_useless_type_conversi=
on.
    STRIP_USELESS_TYPE_CONVERSION is mostly used inside the gimplifier
    and the places where it is used outside of the gimplifier would not
    be adding too much overhead.

    OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

    Thanks,
    Andrew Pinski

            PR c/104506

    gcc/ChangeLog:

            * tree-ssa.cc (tree_ssa_useless_type_conversion):
            Check the inner type before calling useless_type_conversion_p.

    gcc/testsuite/ChangeLog:

            * gcc.dg/pr104506-1.c: New test.
            * gcc.dg/pr104506-2.c: New test.
            * gcc.dg/pr104506-3.c: New test.=