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
