Re: Building eBPF programs

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On Friday, October 18, 2019 9:59:11 AM EDT Chris Adams wrote:
> Once upon a time, Tom Hughes <tom@xxxxxxxxxx> said:
> 
> > Well I imagine clang will define it when targetting x86_64 output
> > but in this case he is targetting BPF output instead.
> > 
> > Adding -D__x86_64__ to the command line may be the quickest workaround
> > for now though.
> 
> Yes, but in my VERY limited understanding, a given compiled eBPF object
> is only for the specific kernel it was compiled against.  The kernel
> headers define structures differently for different architectures, so to
> use them, you have to have the right defines in the compiler.
> 
> There's probably a better way than just using -D__x86_64__ though, since
> that would (obviously) only be correct on x86_64.  Fedora supports other
> architectures, so there should be a more generic way to get the correct
> architecture macros defined.

Passing the __x86_64__ flag seems to work. At least it works for one arch.

-Steve

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