diff --git a/etc/FindMessages.tcl b/etc/FindMessages.tcl
new file mode 100755
index 00000000..325a2bc1
--- /dev/null
+++ b/etc/FindMessages.tcl
@@ -0,0 +1,85 @@
+#!/bin/sh
+# The next line is executed by /bin/sh, but not Tcl \
+exec tclsh $0 ${1+"$@"}
+
+# Parallax Static Timing Analyzer
+# Copyright (c) 2020, Parallax Software, Inc.
+# All rights reserved.
+# 
+# No part of this document may be copied, transmitted or
+# disclosed in any form or fashion without the express
+# written consent of Parallax Software, Inc.
+
+# Find warning/error message IDs and detect collisions.
+# Usage: FindMessages.tcl > doc/messages.txt
+
+proc scan_file { file warn_regexp } {
+  global msgs
+
+  if { [file exists $file] } {
+    set in_stream [open $file r]
+    gets $in_stream line
+    set file_line 1
+
+    while { ![eof $in_stream] } {
+      if { [regexp -- $warn_regexp $line ignore1 ignore2 msg_id msg] } {
+        lappend msgs "$msg_id $file $file_line $msg"
+      }
+      gets $in_stream line
+      incr file_line
+    }
+    close $in_stream
+  } else {
+    puts "Warning: file $file not found."
+  }
+}
+
+set subdirs {app dcalc graph liberty network parasitics \
+                 power sdc sdf search spice util verilog tcl}
+set files_c {}
+foreach subdir $subdirs {
+    set files [glob -nocomplain [file join $subdir "*.{cc,hh,yy,ll,i}"]]
+    set files_c [concat $files_c $files]
+}
+set warn_regexp_c {(criticalError|->warn|->fileWarn|->error|->fileError|libWarn|libError| warn)\(([0-9]+),.*(".+")}
+
+set files_tcl {}
+foreach subdir $subdirs {
+  set files_tcl [concat $files_tcl [glob -nocomplain [file join $subdir "*.tcl"]]]
+}
+set warn_regexp_tcl {(sta_warn|sta_error|sta_warn_error) ([0-9]+) (".+")}
+
+proc scan_files {files warn_regexp } {
+  foreach file $files {
+    scan_file $file $warn_regexp
+  }
+}
+
+proc check_msgs { } {
+  global msgs
+
+  set msgs [lsort -index 0 -integer $msgs]
+  set prev_id -1
+  foreach msg $msgs {
+    set msg_id [lindex $msg 0]
+    if { $msg_id == $prev_id } {
+      puts "Warning: $msg_id duplicated"
+    }
+    set prev_id $msg_id
+  }
+}
+
+proc report_msgs { } {
+  global msgs
+
+  foreach msg_info $msgs {
+    lassign $msg_info msg_id file line msg1
+    puts "[format %04d $msg_id] [format %-25s [file tail $file]:$line] $msg1"
+  }
+}
+
+set msgs {}
+scan_files $files_c $warn_regexp_c
+scan_files $files_tcl $warn_regexp_tcl
+check_msgs
+report_msgs
diff --git a/test/asap7_small.lib.gz b/test/asap7_small.lib.gz
new file mode 100644
index 00000000..3c47419f
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