[issue42587] test_buffer fails on Python built with GCC 11

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> FAIL: test_memoryview_cast (test.test_buffer.TestBufferProtocol)

On AArch64, GCC 11 miscompiles unpack_cmp() of Objects/memoryview.c for the '?' case:

    /* boolean */
    case '?': CMP_SINGLE(p, q, _Bool); return equal;

I reported the bug to GCC upstream: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98190

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