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From: "muecker at gwdg dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/29970] mixing ({...}) with VLA leads to massive breakage
Date: Thu, 05 Aug 2021 18:25:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D29970

--- Comment #9 from Martin Uecker <muecker at gwdg dot de> ---
The sizeof problem is that in c_expr_sizeof_expr the argument of sizeof is =
only
evaluated for VLAs but not for structs of variable size. The information ab=
out
the size is then lost. Changing this fixes some more cases.

A third problem seems to be that in gimplify_target_expr the size expressio=
ns
are also gimplified to early. Fixing this also seems to fix some of the cas=
es,
but then triggers some other down stream problems...=