Re: Detecting that AC_PROG_LIBTOOL has been invoked

[Benoit Sigoure]

On Dec 14, 2007, at 1:24 PM, Paolo Bonzini wrote:

> > The reason why I'm asking this is that I wrote some macros that  
> > rely on Libtool's magic handling of -R and even though it's  
> > clearly stated in the doc/comments/README that Libtool is  
> > mandatory, people keep running in troubles because they didn't use  
> > Libtool, so I'd like to trigger an error, somehow, to tell them  
> > that they did something wrong.
>
> 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.


What is the m4_provide_if?  I didn't find it in the manual of  
autoconf and m4.
Anyways, does this guarantee me that the user did INVOKE the give  
macros, not merely that they exist?

--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory