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From: "jlegg at feralinteractive dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/109700] ICE with address sanitizer after declaring
 __builtin_alloca
Date: Tue, 02 May 2023 19:10:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109700

--- Comment #6 from James Legg <jlegg at feralinteractive dot com> ---
Yes, declaring bulitin functions is bad, but I didn't expect the ICE.

It wasn't done intentionally. glibc's alloca.h defines a alloca(s) macro as
__builtin_alloca(s). I had some code defining _alloca as alloca for
compatibility with code written to use MSC's _alloca function, and some code
intended to build with MSC that attempted to declare _alloca instead of
including the appropriate header, but due to macro expansion it was actually
declaring __builtin_alloca.=