Re: Require m4_ prefix from within the file?

[Eric Blake]

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According to Paul Kirkaas on 3/17/2009 7:01 AM:
> Hi;

Hello Paul,

> Is there any m4 command I can put inside the file to have the same
> effect, so that users don't need to remember to invoke m4 with the -P
> command line argument?

Yes, you can rename macros on the fly.  For example,

define(`m4_defn', defn(`defn'))
define(`m4_define', m4_defn(`define'))
m4_define(`m4_undefine', m4_defn(`undefine'))
m4_undefine(`defn', `define', `undefine')

The manual also mentions this:
http://www.gnu.org/software/m4/manual/m4.html#Defn

And it is how Autoconf's m4sugar does things, in line 74-169 of:
http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=blob;f=lib/m4sugar/m4sugar.m4;h=8356d08;hb=239b052

Note how m4sugar takes care to _not_ rename dnl, as well as being careful
to create m4_exit rather than m4_m4exit.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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