1 files changed, 23 insertions, 0 deletions
diff --git a/tools/check-includes.pl b/tools/check-includes.pl
new file mode 100755
index 0000000..c8bfcba
--- /dev/null
+++ b/tools/check-includes.pl
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: CC0-1.0
+#!/usr/bin/env perl
+#
+# checkincludes: Find files included more than once in (other) files.
+
+foreach $file (@ARGV) {
+	open(FILE, $file) or die "Cannot open $file: $!.\n";
+
+	my %includedfiles = ();
+
+	while (<FILE>) {
+		if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
+			++$includedfiles{$1};
+		}
+	}
+	foreach $filename (keys %includedfiles) {
+		if ($includedfiles{$filename} > 1) {
+			print "$file: $filename is included more than once.\n";
+		}
+	}
+
+	close(FILE);
+}