Document new gnu extensions, okay jmc@, otto@

1 files changed, 11 insertions, 6 deletions

diff --git a/usr.bin/m4/m4.1 b/usr.bin/m4/m4.1
index 45e7803677c..46c99d0d424 100644
--- a/usr.bin/m4/m4.1
+++ b/usr.bin/m4/m4.1
@@ -1,4 +1,4 @@
-.\"	@(#) $OpenBSD: m4.1,v 1.52 2008/08/16 12:26:07 espie Exp $
+.\"	@(#) $OpenBSD: m4.1,v 1.53 2008/08/21 21:02:28 espie Exp $
 .\"
 .\" Copyright (c) 1989, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -30,7 +30,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: August 16 2008 $
+.Dd $Mdocdate: August 21 2008 $
 .Dt M4 1
 .Os
 .Sh NAME
@@ -138,7 +138,11 @@ Activate GNU-m4 compatibility mode.
 In this mode, translit handles simple character
 ranges (e.g., a-z), regular expressions mimic emacs behavior,
 multiple m4wrap calls are handled as a stack,
-and the number of diversions is unlimited.
+the number of diversions is unlimited,
+empty names for macro definitions are allowed,
+and eval understands
+.Sq 0rbase:value
+numbers.
 .It Fl I Ar "dirname"
 Add directory
 .Ar dirname
@@ -268,9 +272,10 @@ with escape sequences substituted with
 .Fa arg1
 and following arguments, in a way similar to
 .Xr printf 3 .
-This built-in is only available in GNU-m4 compatibility mode, and the
-left-padding flag, an optional field width and the %s data type
-are the only supported parameters.
+This built-in is only available in GNU-m4 compatibility mode, and the only
+parameters implemented are there for autoconf compatibility:
+left-padding flag, an optional field width, a maximum field width, 
+*-specified field widths, and the %s and %c data type.
 .It Fn ifdef name yes no
 If the macro named by the first argument is defined then return the second
 argument, otherwise the third.