[Buildroot] [RFC] [PATCH v2 2/2] support/kconfig: Bump to kconfig from Linux 4.17-rc2
Yann E. MORIN
yann.morin.1998 at free.fr
Mon May 28 20:37:43 UTC 2018
Arnout, Thomas, All,
On 2018-05-22 23:22 +0200, Arnout Vandecappelle spake thusly:
> On 20-05-18 16:50, Thomas Petazzoni wrote:
> > Hello,
> >
> > On Sun, 20 May 2018 16:41:41 +0200, Yann E. MORIN wrote:
> >
> >> I initially did not reply further to this part, becuase I seem to
> >> remember that there was a change in behavious with certain versions of
> >> flex/bison, that made the output change drastically, and I was afraid we
> >> could be bitten by this...
> >>
> >> But in the end, this is not a problem, because we would not care to
> >> mix-n-match files built with different versions of said tools, as they
> >> would be those from the distro, always, and never those we ship, since
> >> we would no longer ship them.
> >>
> >> And eventually, I now remember that the issue was with gperf changing
> >> its API (a function prototype changed), and that was causing pain. But
> >> now, kconfig no longer uses gperf to start with, so no incompatibility
> >> anymore anyway.
> >>
> >> Which would allow us to drop the dependency of linux on host-{flex,bison}
> >> that we had to add recently.
> >
> > If we start relying on the system-installed flex and bison, then we
> > should remove host-flex and host-bison entirely, not only for the linux
> > package. The question is whether bison and flex both behave in a
> > reasonably similar way regardless of which version is used.
>
> I briefly looked at this in Paris, and it became clear very quickly that even a
> minor change in the bison version would give a completely different .c file. If
> this is a source file that will be built for the target, it's going to be a
> major reproducibility-killer. So I don't think we can remove host-bison and
> host-flex.
We're only talking about dropping the need for host-flex and host-bison
for the kconfig stuff. In this case, we don;t care that the user
generates C code one way or another: it's only a host tool...
Regards,
Yann E. MORIN.
--
.-----------------.--------------------.------------------.--------------------.
| Yann E. MORIN | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software Designer | \ / CAMPAIGN | ___ |
| +33 223 225 172 `------------.-------: X AGAINST | \e/ There is no |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL | v conspiracy. |
'------------------------------^-------^------------------^--------------------'
More information about the buildroot
mailing list