0c927c98a7
As reported in https://github.com/systemd/systemd/issues/38222, we get the buffer size calculation wrong on 32-bit arm. The reporter suggested checking if __TIMESIZE == 64, but I think it's better to just use the bigger size in all cases. The code to guesstimate the buffer size was already tweaked a few times and apparently it's not easy to get it right. Systemd and glibc might be compiled with different combinations of __TIMESIZE, so the compile-time check is not super reliable, and by using the bigger size, we don't depend on the details of how glibc decided whether to duplicate the struct or not. The cost is negligible, 16 bytes on stack, so let's do the easy and robust thing. Solution based on the suggestion by UZver24. While at it, drop the mock struct definitions. They are only used to calculate the size, but since the types involved are 8-bit values, there are no alignment issues and we can just calculate the size directly. Fixes https://github.com/systemd/systemd/issues/38222.
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