diff options
Diffstat (limited to 'usr.bin/m4/m4.1')
| -rw-r--r-- | usr.bin/m4/m4.1 | 83 |
1 files changed, 82 insertions, 1 deletions
diff --git a/usr.bin/m4/m4.1 b/usr.bin/m4/m4.1 index 560099d9ec4..223f2967711 100644 --- a/usr.bin/m4/m4.1 +++ b/usr.bin/m4/m4.1 @@ -1,4 +1,4 @@ -.\" @(#) $OpenBSD: m4.1,v 1.22 2001/09/27 11:40:33 espie Exp $ +.\" @(#) $OpenBSD: m4.1,v 1.23 2001/09/29 11:56:18 espie Exp $ .\" .\" .Dd January 26, 1993 @@ -9,6 +9,8 @@ .Nd macro language processor .Sh SYNOPSIS .Nm m4 +.Op Fl d Ar flags +.Op Fl t Ar name .Op Fl g .Oo .Fl D Ns Ar name Ns Op Ar =value @@ -66,6 +68,36 @@ Undefine the symbol Add directory .Ar dirname to the include path. +.It Fl d Ar "flags" +Set trace flags. +.Ar flags +may hold the following: +.Bl -tag -width Ds +.It Ar a +print macro arguments. +.It Ar c +print macro expansion over several lines. +.It Ar e +print result of macro expansion. +.It Ar f +print filename location. +.It Ar l +print line number. +.It Ar q +quote arguments and expansion with the current quotes. +.It Ar t +start with all macros traced. +.It Ar x +number macro expansions. +.It Ar V +turn on all options. +.El +.Pp +By default, trace is set to +.Qq eq . +.It Fl t Ar macro +Turn tracing on for +.Ar macro . .It Fl g Activate GNU-m4 compatibility mode. In this mode, changequote with @@ -295,6 +327,55 @@ Returns the current file's line number. .It Ic __file__ Returns the current file's name. .El +.Sh COMPATIBILITY +.Nm +follows the Single Unix 2 specification, along with a few extensions taken +from +.Nm gnu-m4 . +.Pp +The +.Fl s +option +.Po +.Xr cpp 1 's +#line directives +.Pc +is currently not supported. +Flags +.Fl I , +.Fl d , +.Fl t +are non-standard. +.Pp +The output format of tracing and of +.Ic dumpdef +are not specified in any standard, +are likely to change and should not be relied upon. +The current format of tracing is closely modelled on +.Nm gnu-m4 , +to allow +.Nm autoconf +to work. +.Pp +For portability, one should not use the macros +.Ic builtin , +.Ic esycmd , +.Ic expr , +.Ic indir , +.Ic paste , +.Ic patsubst , +.Ic regexp , +.Ic spaste , +.Ic unix , +.Ic __line__ , +.Ic __file__ . +.Pp +All builtins do expand without arguments in many other +.Nm m4 . +.Pp +Many other +.Nm +have dire size limitations with respect to buffer sizes. .Sh AUTHORS Ozan Yigit <oz@sis.yorku.ca> and Richard A. O'Keefe (ok@goanna.cs.rmit.OZ.AU). GNU-m4 compatibility extensions by Marc Espie <espie@cvs.openbsd.org>. |