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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/36566] Cannot bind packed field
Date: Wed, 18 Mar 2015 01:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36566

--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Xiao Jia from comment #7)
> Adding "const" makes it compile.  Is this the intended behavior or not?

Yes, of course. A const-reference causes a temporary to be created, you didn't
bind to the packed field:

    Squeeze oj;
    oj.s = 0;
    const short& pit(oj.s);
    oj.s = 1;
    printf("%d %d", oj.s, pit);

This shows that oj.s and pit are not the same variable.