On Wed, 2022-11-30 at 09:07 +0100, Alexander Kanavin wrote: > > > > 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. > > > > > > > > 2. This branch is run through a-full on the autobuilder. Any > > > > uncovered > > > > issues are filed as bugs.
Your email prompted me to check my own software (Dropbear) and it showed a few y2038 issues to fix. Those bugs wouldn't be noticed from a quick test - it "only" prevented auth and idle timeouts from occurring. gcc and clang are able to flag truncated conversions for 64-bit time_t with -Wconversion, but that's very noisy. Comparing that against a 32-bit time_t build, however, gives a pretty clean list of code that needs attention. As an experiment I've built OpenBMC with and without 64-bit time_t, https://github.com/mkj/yocto-y2038 has the results and a description. There are a mix of false positives (particularly tv_usec/tv_nsec), but also some real-looking things. As an example, busybox using a uint32_t to copy a dhcpd lease expiry. I'm not sure the best way to use these logs - they need manual review. Expanding the list of packages should be easy, but there will be more that need manual intervention to get rid of -Werror. Cheers, Matt
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