* Eric Blake wrote on Tue, Apr 07, 2009 at 04:25:12AM CEST: > I'm also leaning towards omitting the else if $1 is provably blank, OK with me. > otherwise providing the : in case non-blank $1 ultimately expands to a > blank (unless someone finds a shell where 'if false ; then :; fi; echo $?' > fails to output 0). > AS_CASE and AS_FOR are also candidates for this. AS_CASE copes well with empty args number 3, 5, 7, ... default, and the output looks nice that way, too. > Now for a question - right now, m4_default([$1], [$2]) is a nice shorthand > for m4_ifval([$1], [$1], [$2]); is there any reason to create a shorthand > for m4_ifnblank([$1], [$1], [$2]) that likewise only needs two arguments? > And if so, what to call it? But that isn't what you need here. There are situations in which you cannot prove whether $1 is blank or not. In that case, we should add both the ":\n" as well as $1. Cheers, Ralf _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
