From 35141f304e319109c322f797ae71c0b9420ccb05 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 5 Jan 2023 18:21:25 +0100
Subject: time: Set daylight to 1 for matching DST/offset change (bug 29951)

The daylight variable is supposed to be set to 1 if DST is ever in
use for the current time zone.  But __tzfile_read used to do this:

  __daylight = rule_stdoff != rule_dstoff;

This check can fail to set __daylight to 1 if the DST and non-DST
offsets happen to be the same.
---
 timezone/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'timezone/Makefile')

diff --git a/timezone/Makefile b/timezone/Makefile
index a789c22..5002de3 100644
--- a/timezone/Makefile
+++ b/timezone/Makefile
@@ -23,7 +23,7 @@ subdir	:= timezone
 include ../Makeconfig
 
 others	:= zdump zic
-tests	:= test-tz tst-timezone tst-tzset tst-bz28707
+tests	:= test-tz tst-timezone tst-tzset tst-bz28707 tst-bz29951
 
 generated-dirs += testdata
 
@@ -86,11 +86,13 @@ $(objpfx)tst-timezone.out: $(addprefix $(testdata)/, \
 				       Europe/London)
 $(objpfx)tst-tzset.out: $(addprefix $(testdata)/XT, 1 2 3 4)
 $(objpfx)tst-bz28707.out: $(testdata)/XT5
+$(objpfx)tst-bz29951.out: $(testdata)/XT6
 
 test-tz-ENV = TZDIR=$(testdata)
 tst-timezone-ENV = TZDIR=$(testdata)
 tst-tzset-ENV = TZDIR=$(testdata)
 tst-bz28707-ENV = TZDIR=$(testdata)
+tst-bz29951-ENV = TZDIR=$(testdata)
 
 # Note this must come second in the deps list for $(built-program-cmd) to work.
 zic-deps = $(objpfx)zic $(leapseconds) yearistype
-- 
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