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Re: [systemtap trunk] Build error on eBPF.
On Fri, 2017-04-14 at 20:17 +0900, Tetsuo Handa wrote:
> Mark Wielaard wrote:
> > On Wed, 2017-04-12 at 23:24 +0900, Tetsuo Handa wrote:
> > > Commit 7e2cd9f56293f697 ("Squashed commit of the eBPF backend for stap")
> > > caused following build error when trying to build on CentOS 7.
> >
> > Older GCC versions seemed to have some trouble with initialization of
> > anonymous struct fields in unions. Older elfutils didn't provide some
> > strtab manipulation functions. And some older kernel headers didn't
> > define all needed constants.
> >
> > I pushed the following commits to hopefully fix the compilation (I
> > haven't tested running the ebpf backend yet):
>
> > Could you check if that helps in your case (my setup isn't really a pure
> > CentOS7 one).
>
> Thank you. But linux/bpf.h check seems to be missing.
Aha. Seems I have a slightly older version than Richard tested with, but
you don't have it at all. Could you try to update your git sources with
this commit:
commit 7ca1ffe6e431e4818a9a479935d75a428d2aaf57
Author: Mark Wielaard <mark@klomp.org>
Date: Fri Apr 14 13:52:39 2017 +0200
configure: Check for linux/bpf.h header.
Don't build bpf backend support if there is no bpf.h header.
Skip translate_bpf_pass if there is no bpf support.
Regenerate configure and Makefile.in.
It should completely skip building the bpf backend in your case.
Thanks,
Mark