docs: use SOURCE_DATE_EPOCH for generated manpages

This should make builds from Git reproducible.

Closes #12092

diff --git a/docs/cmdline-opts/gen.pl b/docs/cmdline-opts/gen.pl
index 8b9b98bb2d861575f4bf87e7c72ed12f78959e4f..edf90622b2ea1a8e7460dff58a9cf8f0ce0c9657 100755 (executable)
--- a/docs/cmdline-opts/gen.pl
+++ b/docs/cmdline-opts/gen.pl
@@ -48,8 +48,14 @@ my %protolong;
 my %catlong;
 
 use POSIX qw(strftime);
-my $date = strftime "%B %d %Y", localtime;
-my $year = strftime "%Y", localtime;
+my @ts;
+if (defined($ENV{SOURCE_DATE_EPOCH})) {
+    @ts = localtime($ENV{SOURCE_DATE_EPOCH});
+} else {
+    @ts = localtime;
+}
+my $date = strftime "%B %d %Y", @ts;
+my $year = strftime "%Y", @ts;
 my $version = "unknown";
 my $globals;
 

diff --git a/docs/libcurl/mksymbolsmanpage.pl b/docs/libcurl/mksymbolsmanpage.pl
index a8cb10d82ac0f685ffddffc8021997572c372fcc..3bc6869491856695e75ef65c615a148a183f6342 100755 (executable)
--- a/docs/libcurl/mksymbolsmanpage.pl
+++ b/docs/libcurl/mksymbolsmanpage.pl
@@ -26,8 +26,14 @@
 my $version="7.41.0";
 
 use POSIX qw(strftime);
-my $date = strftime "%b %e, %Y", localtime;
-my $year = strftime "%Y", localtime;
+my @ts;
+if (defined($ENV{SOURCE_DATE_EPOCH})) {
+    @ts = localtime($ENV{SOURCE_DATE_EPOCH});
+} else {
+    @ts = localtime;
+}
+my $date = strftime "%b %e, %Y", @ts;
+my $year = strftime "%Y", @ts;
 
 print <<HEADER
 .\\" **************************************************************************