Add a note about how to check for bare < and & in SGML docs, before the

knowledge disappears again.

diff --git a/doc/src/sgml/Makefile b/doc/src/sgml/Makefile
index a12af29bf805e8b9271e2f35d193724c6042dedd..b3cf38d7e9e76ba32ca1d812986ff4f40746bed9 100644 (file)
--- a/doc/src/sgml/Makefile
+++ b/doc/src/sgml/Makefile
@@ -53,6 +53,9 @@ endif
 # Enable some extra warnings
 # -wfully-tagged needed to throw a warning on missing tags 
 # for older tool chains, 2007-08-31
+# Note: try "make SPFLAGS=-wxml" to catch a lot of other dubious constructs,
+# in particular < and & that haven't been made into entities.  It's far too
+# noisy to turn on by default, unfortunately.
 override SPFLAGS += -wall -wno-unused-param -wno-empty -wfully-tagged
 
 ##