git: a8f92d247e77 - main - Enable -Wdate-time warning

The branch main has been updated by emaste:

URL: https://cgit.FreeBSD.org/src/commit/?id=a8f92d247e77f97f70aada494210bf04f1f7ef39

commit a8f92d247e77f97f70aada494210bf04f1f7ef39
Author:     Ed Maste <emaste@FreeBSD.org>
AuthorDate: 2022-02-09 22:10:03 +0000
Commit:     Ed Maste <emaste@FreeBSD.org>
CommitDate: 2022-11-30 18:59:57 +0000

    Enable -Wdate-time warning
    
    This produces an "expansion of date or time macro is not reproducible"
    warning or error upon use of __DATE__ or __TIME__.
    
    Provide NO_WDATE_TIME for ports or 3rd party software to opt out.
    
    This is a recommit of 489d7a8528ca, which was reverted (by baf8cbcd97a6)
    due to ports build failures.
    
    PR:             267902 [exp-run]
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D29580
---
 share/mk/bsd.sys.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/share/mk/bsd.sys.mk b/share/mk/bsd.sys.mk
index 02a27e0f9464..18aecfbcc110 100644
--- a/share/mk/bsd.sys.mk
+++ b/share/mk/bsd.sys.mk
@@ -75,6 +75,9 @@ CWARNFLAGS.clang+=	-Wthread-safety
 CWARNFLAGS+=	-Wno-uninitialized
 .endif # WARNS >=2 && WARNS <= 4
 CWARNFLAGS+=	-Wno-pointer-sign
+.if !defined(NO_WDATE_TIME)
+CWARNFLAGS+=	-Wdate-time
+.endif # NO_WDATE_TIME
 # Clang has more warnings enabled by default, and when using -Wall, so if WARNS
 # is set to low values, these have to be disabled explicitly.
 .if ${WARNS} <= 6