From 6af21e6a4f2251e71353562d5df7f376fdffc270 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Tue, 25 Mar 2025 17:36:52 -0400
Subject: initial checkout from wrc

---
 util/mergedep.pl | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 util/mergedep.pl

(limited to 'util/mergedep.pl')

diff --git a/util/mergedep.pl b/util/mergedep.pl
new file mode 100644
index 0000000..1730d53
--- /dev/null
+++ b/util/mergedep.pl
@@ -0,0 +1,86 @@
+#!/usr/bin/perl
+# Copyright 2003 Bryan Ford
+# Distributed under the GNU General Public License.
+#
+# Usage: mergedep <main-depfile> [<new-depfiles> ...]
+#
+# This script merges the contents of all <new-depfiles> specified
+# on the command line into the single file <main-depfile>,
+# which may or may not previously exist.
+# Dependencies in the <new-depfiles> will override
+# any existing dependencies for the same targets in <main-depfile>.
+# The <new-depfiles> are deleted after <main-depfile> is updated.
+#
+# The <new-depfiles> are typically generated by GCC with the -MD option,
+# and the <main-depfile> is typically included from a Makefile,
+# as shown here for GNU 'make':
+#
+#	.deps: $(wildcard *.d)
+#		perl mergedep $@ $^
+#	-include .deps
+#
+# This script properly handles multiple dependencies per <new-depfile>,
+# including dependencies having no target,
+# so it is compatible with GCC3's -MP option.
+#
+
+sub readdeps {
+	my $filename = shift;
+
+	open(DEPFILE, $filename) or return 0;
+	while (<DEPFILE>) {
+		if (/([^:]*):([^\\:]*)([\\]?)$/) {
+			my $target = $1;
+			my $deplines = $2;
+			my $slash = $3;
+			while ($slash ne '') {
+				$_ = <DEPFILE>;
+				defined($_) or die
+					"Unterminated dependency in $filename";
+				/(^[ \t][^\\]*)([\\]?)$/ or die
+					"Bad continuation line in $filename";
+				$deplines = "$deplines\\\n$1";
+				$slash = $2;
+			}
+			#print "DEPENDENCY [[$target]]: [[$deplines]]\n";
+			$dephash{$target} = $deplines;
+		} elsif (/^[#]?[ \t]*$/) {
+			# ignore blank lines and comments
+		} else {
+			die "Bad dependency line in $filename: $_";
+		}
+	}
+	close DEPFILE;
+	return 1;
+}
+
+
+if ($#ARGV < 0) {
+	print "Usage: mergedep <main-depfile> [<new-depfiles> ..]\n";
+	exit(1);
+}
+
+%dephash = ();
+
+# Read the main dependency file
+$maindeps = $ARGV[0];
+readdeps($maindeps);
+
+# Read and merge in the new dependency files
+foreach $i (1 .. $#ARGV) {
+	readdeps($ARGV[$i]) or die "Can't open $ARGV[$i]";
+}
+
+# Update the main dependency file
+open(DEPFILE, ">$maindeps.tmp") or die "Can't open output file $maindeps.tmp";
+foreach $target (keys %dephash) {
+	print DEPFILE "$target:$dephash{$target}";
+}
+close DEPFILE;
+rename("$maindeps.tmp", "$maindeps") or die "Can't overwrite $maindeps";
+
+# Finally, delete the new dependency files
+foreach $i (1 .. $#ARGV) {
+	unlink($ARGV[$i]) or print "Error removing $ARGV[$i]\n";
+}
+
-- 
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