From bfb35cfda11d529f02c698e87ae298309a776305 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Mon, 10 Feb 2014 10:37:11 +0100
Subject: [PATCH 1/1] build-sys: add check-includes build target and script

---
 Makefile.am             |  8 ++++++++
 tools/check-includes.pl | 23 +++++++++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100755 tools/check-includes.pl

diff --git a/Makefile.am b/Makefile.am
index 4f5e03699..3730e71dc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4936,6 +4936,14 @@ CLEANFILES += \
 check-api-unused: defined undefined exported
 	( cat exported undefined ) | sort -u  | diff -u - defined | grep ^+ | grep -v ^+++ | cut -c2-
 
+.PHONY: check-includes
+check-includes: $(top_srcdir)/tools/check-includes.pl
+	$(AM_V_GEN) find * -name '*.[hcS]' -type f -print | sort -u \
+		| xargs $(top_srcdir)/tools/check-includes.pl
+
+EXTRA_DIST += \
+	$(top_srcdir)/tools/check-includes.pl
+
 # Stupid test that everything purported to be exported really is
 
 define generate-sym-test
diff --git a/tools/check-includes.pl b/tools/check-includes.pl
new file mode 100755
index 000000000..bf23929d4
--- /dev/null
+++ b/tools/check-includes.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/perl
+#
+# checkincludes: Find files included more than once in (other) files.
+# Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
+
+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);
+}
-- 
2.30.2