Add script useful for finding checks for headers that are never used

(This used to be commit 0e5fdbc01bba7f1b000587d01a128c3bdbbbe03c)

diff --git a/source4/script/find_unused_header_checks.pl b/source4/script/find_unused_header_checks.pl
new file mode 100755 (executable)
index 0000000..3caf9da
--- /dev/null
+++ b/source4/script/find_unused_header_checks.pl
@@ -0,0 +1,38 @@
+#!/usr/bin/perl
+# Script that reads in configure and outputs the names of all the defines 
+# it defines that are used nowhere in the code
+
+# Arguments:
+#  1: configure.in
+#  2: header files
+#
+# You might want to specify configure.in again in the list of header files 
+# as well, because it also uses some includes.
+
+my %symbols;
+
+# First, make a list of defines in configure
+$in = shift;
+
+while($tmp = shift) { 
+       open(FI, $tmp);
+       while(<FI>) { 
+               while(/\#([ \t]*)include <(.*)>/sgm) { 
+                       $symbols{$2} = 1;
+               }
+       }
+       close FI;
+}
+
+open(IN, $in) or die("Can't open $in");
+
+while(<IN>) {
+       if(/AC_CHECK_HEADERS\(([\[]*)(.*)([\]]*)\)/) {
+               @hs = split / /, $2;
+               foreach(@hs) { 
+                       if($symbols{$_} != 1) { print "|$_|\n"; }
+               }
+       }
+}
+
+close IN;