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https://bugs.gentoo.org/520818
https://bugs.gentoo.org/574492
https://lists.gnu.org/archive/html/bug-automake/2014-10/msg00003.html
https://lists.gnu.org/archive/html/bug-automake/2014-10/msg00004.html
https://debbugs.gnu.org/20314
https://bugs.debian.org/782345
https://lists.gnu.org/archive/html/automake-patches/2015-04/msg00000.html
From: Reiner Herrmann <reiner@reiner-h.de>
Date: Sat, 18 Jul 2015 14:10:35 -0400
Subject: Make output of mdate-sh deterministic
mdate-sh pretty-prints the modification time of a file.
But it's output can vary depending on the timezone of
the caller. Someone in timezone GMT-12 will get a different
result (day) than someone in timezone GMT+12.
As this output is also used to create/update stamp files,
which influence the further build process, the build result
can vary.
To enable reproducible builds and to have a more deterministic
build behavior, this change fixes the timezone to UTC.
Signed-off-by: Reiner Herrmann <reiner at reiner-h.de>
---
lib/mdate-sh | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/mdate-sh b/lib/mdate-sh
index e8dfaca..9e2c0c9 100755
--- a/lib/mdate-sh
+++ b/lib/mdate-sh
@@ -1,7 +1,7 @@
#!/bin/sh
# Get modification time of a file or directory and pretty-print it.
-scriptversion=2010-08-21.06; # UTC
+scriptversion=2015-04-09.19; # UTC
# Copyright (C) 1995-2014 Free Software Foundation, Inc.
# written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, June 1995
@@ -74,6 +74,10 @@ export LC_ALL
LC_TIME=C
export LC_TIME
+# Use UTC to get reproducible result
+TZ=UTC
+export TZ
+
# GNU ls changes its time format in response to the TIME_STYLE
# variable. Since we cannot assume 'unset' works, revert this
# variable to its documented default.
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