[Toybox] FYI: kernel builds rely on GNU expr extensions

[enh]

On Fri, May 3, 2019 at 11:28 AM Rob Landley <rob at landley.net> wrote:
>
> On 5/2/19 4:20 PM, enh wrote:
> > (fwiw, with an instrumented build of the 4.19 Android common kernel, i
> > only see `expr 4 * 65536 + 019 * 256 + 037`. so i don't know what
> > they're _really_ doing to hit this.)
>
> Back under Aboriginal Linux what I'd do is prepare two parallel package build
> folders, one with the new environment and one with the old environment, then run
> a UP build with "2>&1 | tee out.txt" (no parallelism so no log jitter and where
> it stops is the first time it noticed the problem), then rename that directory
> and name the second directory in its place (so both builds have the same
> absolute path to reduce log diff) and build the other one, and then diff both
> entire trees and swear about all the false positives caused by the clock
> changing and that making its way into binary output and/or logs. Oh, and V=1 in
> kernel builds, obviously...
>
> This sort of thing was often a multi-day dig. I need to build up mkroot so it's
> building as many things as aboriginal linux used to, but have yet to circle my
> way back around to that...
>
> Where's the git repo and .config for this kernel they're trying to build when
> they hit this?

no idea. i'm playing telephone --- it's not true for the Android common kernel.

i'll let you know if i find out what's really going on.

> Rob
>
> P.S. Yeah, I should start the Giant AOSP download onto the new machine when I
> get back to the cable modem after lunch. 16 gigs ram and 2 terabyte drive,
> should _finally_ have space for it. Only an i5-3340M processor though, It's 2X
> SMP @2.7 ghz hyperthreaded to 4X, probably a 24 hour build time for the whole
> image...