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Re: [Y2038] debian/armhf time64 build?

On 2022-09-29 12:24 +0200, Arnd Bergmann wrote:
> On Thu, Sep 29, 2022, at 11:49 AM, Wookey wrote:
> > On 2022-09-29 09:47 +0200, Arnd Bergmann wrote:
> >> 
> >> I think the problem with using dpkg-buildflags is that it breaks
> >> any user building their own applications against Debian provided
> >> libraries, unless they remember to set the flag manually.
> >
> > Yes, but I'm talking about how to do a test rebuild. We set the
> > dpkg-buildflags config to always use -D_TIME_BITS=64 in the build
> > chroot, and build stuff.
> Right, that should work. In my 2020 experiment I did the opposite
> and actually patched glibc to remove the time32 interfaces so
> I could be really sure that everything would use the time64
> path, but clearly at least the core packages all use the
> buildflags correctly.

That is more reliable. We will keep the build logs so can check those
with just grep, or more smartly with a modified blhc, for anything
that did not in fact get the flag set. If it proves to be a problem
then a patched glibc is obviously a sensible approach.

> > Are you aware of anyone else having written up efforts around this
> > (e.g. if the arch people have changed it already they presumably found
> > a load of the things one might trip over).
> Adelie Linux has (had?) a great summary. I can't reach the wiki page
> at the moment, but I found an archive copy at
> https://web.archive.org/web/20220301175235/https://wiki.adelielinux.org/wiki/Project:Time64


Principal hats:  Debian, Wookware, ARM

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