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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug sanitizer/99179] asan failures with -Os on x86_64-apple-darwin20
Date: Wed, 17 Mar 2021 19:24:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99179

--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
I did some more checking on this.

1) It seems that something we produce in the unwind info for alloca is not
compatible with atos.

2) The objects all pass "dwarfdump --verify"

3) If I run the objects under lldb, breakpoints set by line number seem to =
work
properly.

4) If I use a recent llvm-symbolizer (ASAN_SYMBOLIZER_PATH=3D) the tests wo=
rk.

5) the tests also work with clang / libsanitizer.

so, perhaps we have some subtle problem with the unwind information we prod=
uce
with -Os (and when there's an alloca or stack adjustment) - but I don't see
this as something I can address for GCC11 (even if it's fixable).=