Re: Building CVS HEAD libtool outside of source directory

[Eric Blake]

Bob Friesenhahn <bfriesen <at> simple.dallas.tx.us> writes:

> Ralph and I did have a discussion about Autoconf's m4 section today 
> since I noticed that autoconf was selecting 'm4' over 'gm4' even 
> though 'gm4' was freshly-installed GNU m4 1.4.10 and 'm4' was some 
> older version or even FreeBSD m4.  Given the sensitivity to m4 
> versions, it seems like more checks need to applied against 
> candidates, with a dire warning if the best candidate is too old.

Which version of Autoconf?  2.61 and 2.61a checked 'gm4' before 'm4', and quit 
searching on the first m4 it found.  A current autoconf snapshot tries 'm4' 
before 'gm4'.  And since FreeBSD has both the 'indir' builtin and -t option, I 
guess it is not being filtered out.

OK, I'm beefing up the autoconf test.  Am I correct that GNU m4 is the only 
version that supports -F/-R for freezing files?  (I'm basing this on 
http://nixdoc.net/man-pages/FreeBSD/man1/m4.1.html).

-- 
Eric Blake