From 8cac29fafce285f1bd1f51ef89a57fdde347f75a Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 19 Mar 2022 20:02:58 -0400
Subject: main: Pass NULL to time()

If the argument points outside the accessible address space, Linux's
time() system call returns a negative value. [1]  But since this is
indistinguishable from a successful report that the time is before the
Epoch, glibc never actually sets errno.

The Linux man-pages project recommends: "The tloc argument is
obsolescent and should always be NULL in new code.  When tloc is NULL,
the call cannot fail." [2]

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/time/time.c
[2]: https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/man2/time.2?id=300c07ddd873fa1abbff96262ec365271e429dab
---
(limited to 'm4/gl_warnings.m4')

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