autodoc.pl: Check for misuse of the 'n' flag

This flag indicates that the macro has no arguments.  It makes no sense
to use in some situations, which are now checked for.

This commit also documents the long existing 'n' flag.

1 files changed, 5 insertions, 0 deletions

diff --git a/autodoc.pl b/autodoc.pl
index 9a2e9ec44e..43027a7213 100644
--- a/autodoc.pl
+++ b/autodoc.pl
@@ -22,6 +22,9 @@
 # indented. The next input line that is a pod directive terminates this 
 # heading-level documentation.
 
+# The meanings of the flags fields in embed.fnc and the source code is
+# documented at the top of embed.fnc.
+
 use strict;
 
 if (@ARGV) {
@@ -225,6 +228,8 @@ removed without notice.\n\n$docs" if $flags =~ /x/;
 	# nothing
     } else {
         if ($flags =~ /n/) { # no args
+            warn("n flag without m") unless $flags =~ /m/;
+            warn("n flag but apparently has args") if @args;
             print $fh "\t$ret\t$name";
         } else { # full usage
             my $n            = "Perl_"x$p . $name;