Re: [PATCH bpf-next v2 2/4] selftests: bpf: Add helper to compare socket cookies

[Lorenz Bauer]

On Thu, 1 Oct 2020 at 18:11, Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
> >
> > I think this might be the same problem I fixed for libbpf with [0].
> > Turns out, GCC explicitly calls out (somewhere in their docs) that
> > uninitialized variable warnings work only when compiled in optimized
> > mode, because some internal data structures used to detect this are
> > only maintained in optimized mode build.
> >
> > Laurenz, can you try compiling your example with -O2?
>
> All of my experiments I did with -O2.

If anybody wants to play with this more: https://godbolt.org/z/77P6P9

Seems like red hat GCC has some special sauce that fixes this behaviour?

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Lorenz Bauer  |  Systems Engineer
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