Hi Alexander, > On Tue, 29 Nov 2022 at 16:45, Stephen Jolley > <sjolley.yp...@gmail.com> wrote: > > We’d welcome a proposal/series on how to move forward with the > > Y2038 work for 32 bit platforms. > > I have the following proposal: > > 1. A branch is made where: > a. "-D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64" is enabled globally. > b. qemu is always started with "-rtc base=2040-01-01", simulating > Y2038 actually occurring. > c. an additional runtime test verifies that both RTC clock and system > clock report 2040. >
Please find a few comments: 1. There is already provided meta-y2038 [1] to test if 32 bit systems correctly support Y2038 problem. It uses qemu machines from OE/Yocto 2. There are ptest available [2] to validate if the Y2038 problem works correctly. 3. Support for running ptests mentioned in point 2. is already available in the poky repository [3]. > 2. This branch is run through a-full on the autobuilder. Any uncovered > issues are filed as bugs. > > 3. Once *all* of the bugs are addressed, repeat point 2. > > 4. Once there are no more open bugs, 1a is merged into master. > > Any fatal flaws in the plan? > > It's not hard to see that Y2038 problem is real and serious, e.g. on > qemux86 core-image-full-cmdline built from master: > > root@qemux86:~# ls / > bin boot dev etc home lib lost+found media mnt proc > run sbin sys tmp usr var > root@qemux86:~# date -s "2040-01-01" > Sun Jan 1 00:00:00 UTC 2040 > root@qemux86:~# ls / > bin boot dev etc home lib lost+found media mnt proc > run sbin sys tmp usr var > root@qemux86:~# ls / > -sh: ls: command not found > > On qemux86_64 the same sequence works as expected, of course. > Yes, y2038 is an important issue. I would be more than happy if we could reuse the previous work [1]. I've used OE/Yocto to validate the code during developing support for '-D_TIME_BITS=64 ' flag in glibc. It looks like the meta-y2038 can be used out of the box (after checking if it still works with newest poky) when added to the Yocto Project build/test infrastructure. > Alex Links: [1] - https://github.com/lmajewski/meta-y2038 [2] - https://github.com/lmajewski/meta-y2038/blob/master/README#L201 [3] - https://git.yoctoproject.org/poky/commit/?id=0e0c481a25f10f8f7ff1d69bda7f015186da0202 Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lu...@denx.de
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