-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Paolo Bonzini on 10/16/2008 3:55 AM: > (Note: I wanted use this to provide different implementations of > AC_COMPILE_IFELSE for different languages. I think I can also do > without it, but I thought I'd write nevertheless about a more general > m4sugar problem). I'm still digesting the technical content, but some quick comments: > > This is quite robust, as I tried on more examples. The problems are: > > 1) that this requires a contract between the macros: if the definition > uses m4_provide([$0($@)]), the caller should use m4_require_with_args; > otherwise, it should use m4_require. Perhaps we could redefine m4_require to always supply () (equivalent to 1 empty argument), then require that any m4_defun'd macro behave the same with no arguments as it does with one empty argument. Would that allow the caller could get away with either style of require? > > 2) that if "foo" might expand to something that includes commas, you > have to use m4_expand(foo) in the arguments of m4_require_with_args. > This is ugly. m4_quote(foo) is much lighter weight than m4_expand(foo) at protecting against commas; m4_expand is only needed if you are worried about preserving the whitespace after commas in the expansion of foo. - -- Don't work too hard, make some time for fun as well! Eric Blake ebb9@xxxxxxx -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkj3L/UACgkQ84KuGfSFAYDJfgCfc7dsCy2IIQqQmR9JuWY11vb5 ZFUAoKXoWoL/uiibRVqveLuI7da0sTmn =J6G1 -----END PGP SIGNATURE----- _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
