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Make yat2m in libgcrypt respect SOURCE_DATE_EPOCH, making
the build reproducible.
This was already fixed upstream in GnuPG:
https://dev.gnupg.org/rG139de02b93773615bdd95e04a7f0c1ad73b4f6fb
and in libgpg-error:
https://dev.gnupg.org/rE5494a5728418938d2e42158bb646b07124184e64
--- a/doc/yat2m.c 2017-11-23 19:16:58.000000000 +0100
+++ b/doc/yat2m.c 2017-08-28 12:22:54.000000000 +0200
@@ -1475,6 +1484,7 @@
main (int argc, char **argv)
{
int last_argc = -1;
+ const char *s;
opt_source = "GNU";
opt_release = "";
@@ -1608,6 +1618,11 @@
if (argc > 1)
die ("usage: " PGM " [OPTION] [FILE] (try --help for more information)\n");
+ /* Take care of supplied timestamp for reproducible builds. See
+ * https://reproducible-builds.org/specs/source-date-epoch/ */
+ if (!opt_date && (s = getenv ("SOURCE_DATE_EPOCH")) && *s)
+ opt_date = s;
+
/* Start processing. */
if (argc && strcmp (*argv, "-"))
{
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