# HG changeset patch
# User Eric Blake <ebb9@byu.net>
# Date 1262836028 25200
# Node ID e8847ec6bc92c2d3787de0faec9d44879639b16f
# Parent  f46f6a6b078cba29f5570fe601fdb72edd02aff4
maint.mk: detect incorrect GFDL usage

Similar to the existing sc_GPL_version.  Fortunately, the two licenses
have enough distinction in wording so that neither regexp is a false
positive for the other license.  This won't catch files that line wrap
differently than expected; as it was, the GFDL needed two regexp to
handle the use of GFDL in the m4 project.

* top/maint.mk (_GFDL_regexp, sc_GFDL_version): New rule.

Signed-off-by: Eric Blake <ebb9@byu.net>

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-01-06  Eric Blake  <ebb9@byu.net>
+
+	maint.mk: detect incorrect GFDL usage
+	* top/maint.mk (_GFDL_regexp, sc_GFDL_version): New rule.
+
 2010-01-06  Jim Meyering  <meyering@redhat.com>
 	and Eric Blake  <ebb9@byu.net>
 
diff --git a/top/maint.mk b/top/maint.mk
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -495,6 +495,13 @@
 	@re='either ''version [^3]' msg='GPL vN, N!=3'			\
 	  $(_prohibit_regexp)
 
+# Require the latest GFDL.  Two regexp, since some .texi files end up
+# line wrapping between 'Free Documentation License,' and 'Version'.
+_GFDL_regexp = (Free ''Documentation.*Version 1\.[^3]|Version 1\.[^3] or any)
+sc_GFDL_version:
+	@re='$(_GFDL_regexp)' msg='GFDL vN, N!=3'			\
+	  $(_prohibit_regexp)
+
 cvs_keywords = \
   Author|Date|Header|Id|Name|Locker|Log|RCSfile|Revision|Source|State