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Two 'make -p' timestamp issues

From: Paul Eggert
Subject: Two 'make -p' timestamp issues
Date: Sun, 19 Mar 2023 14:51:15 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0

In some unusual, timing-dependent cases on some platforms, 'make -p' can generate output that incorrectly makes it look like the system clock ran backwards, when it didn't.

Also, there's a torture-test case (system clock in the far past or future) where 'make -p' can dump core.

Proposed patch attached.

Attachment: 0001-Fix-clock-skew-crash-issue-with-make-p.patch
Description: Text Data

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