From 3d8d0642da5e5982e17122ab35774f9d5dfca79b Mon Sep 17 00:00:00 2001
From: Janneke Nieuwenhuizen <janneke@gnu.org>
Date: Sat, 6 Apr 2024 19:20:33 +0200
Subject: [PATCH] maint: Reset CreationDate metadata on generated PDFs.

* doc/local.mk (.dot.pdf): Create PDF in UTC0 and reset CreationDate metadata.

Change-Id: I3873ecdeec781c30874d53d032406cbe23922a25
---
 doc/local.mk | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/doc/local.mk b/doc/local.mk
index d049dbf6d1..d18cdf3e5f 100644
--- a/doc/local.mk
+++ b/doc/local.mk
@@ -148,7 +148,11 @@ DOT_OPTIONS =					\
 	$(AM_V_at)mv "$(srcdir)/$@.tmp" "$(srcdir)/$@"
 
 .dot.pdf:
-	$(AM_V_DOT)$(DOT) -Tpdf $(DOT_OPTIONS) < "$<" > "$(srcdir)/$@.tmp"
+	$(AM_V_DOT)set -e; export TZ=UTC0;				\
+	    $(DOT) -Tpdf $(DOT_OPTIONS) < "$<" > "$(srcdir)/$@.tmp"
+	$(AM_V_at)sed -ri					\
+	    -e 's,(/CreationDate \(D:).*\),\119700101000000),'	\
+	    "$(srcdir)/$@.tmp"
 	$(AM_V_at)mv "$(srcdir)/$@.tmp" "$(srcdir)/$@"
 
 .dot.eps: