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Re: Detecting that AC_PROG_LIBTOOL has been invoked


From: Eric Blake
Subject: Re: Detecting that AC_PROG_LIBTOOL has been invoked
Date: Fri, 14 Dec 2007 07:54:54 -0700
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[Adding bug-autoconf, replies can drop libtool]

According to Paolo Bonzini on 12/14/2007 5:24 AM:
> 
> You can use m4_provide_if like this:
> 
> m4_define([m4_provided], [
> m4_provide_if([AC_PROG_LIBTOOL], [], [
> m4_provide_if([LT_INIT], [],
>               [m4_warn([syntax], [Libtool required by $1])])])])])
> 
> ...
> 
> m4_provided([MY_MACRO_NAME])
> 
> I didn't count the number of closing brackets.

Sounds like it's time to document the m4_provide and m4_provide_if
portions of m4sugar.  They are stable enough that they should not remain
undocumented, especially now that you are suggesting their use.

Also, the manual mentions AC_PROVIDE (a synonym for m4_provide), but does
not document it; and it also lacks documentation for AC_PROVIDE_IFELSE (a
synonym for m4_provide_if).  When writing autoconf macros instead of
m4sugar scripts, using the AC_ spellings looks a bit nicer.

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

Eric Blake             address@hidden
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