GNU bug report logs - #46835
Fwd: Debian Bug 983706: gzip FTBFS on mips64el: FAIL: timestamp

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From: Milan Kupcevic <milan <at> debian.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 46835 <at> debbugs.gnu.org
Subject: bug#46835: Fwd: Bug#983706: gzip FTBFS on mips64el: FAIL: timestamp
Date: Fri, 5 Mar 2021 23:40:25 -0500

Hi Paul,

Please take a look at YunQiang's explanation of what is going on.



-------- Forwarded Message --------
Subject: Bug#983706: gzip FTBFS on mips64el: FAIL: timestamp
Resent-Date: Mon, 01 Mar 2021 10:54:34 +0000
Resent-From: YunQiang Su <wzssyqa <at> gmail.com>
Resent-To: debian-bugs-dist <at> lists.debian.org
Resent-CC: Milan Kupcevic <milan <at> debian.org>
Date: Mon, 1 Mar 2021 18:52:50 +0800
From: YunQiang Su <wzssyqa <at> gmail.com>
Reply-To: YunQiang Su <wzssyqa <at> gmail.com>, 983706 <at> bugs.debian.org
To: Adrian Bunk <bunk <at> debian.org>
CC: 983706 <at> bugs.debian.org, debian-mips <at> lists.debian.org

[...]

With some digging, we found the real problem:
    mips64 has y2106 problem

the struct stat in asm/stat.h, the timestamp is unsigned int (uint32_t),
so in the SYS_stat, -1 is converted to 0xffffff.

Then in glibc wrapper of stat, 0xffffffff need to convert to int64_t,
then, it is converted to 2016.

So, current, for gzip, we can just ignore the test fails on mips64el.

To solve this problem: I guess that we can wrap `statx' instead of
`stat' in glibc.
Since the timestamp in bits/stat.h is 64bit, there will no ABI broken.

[...]


-- 
YunQiang Su

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