-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Please don't top-post on technical lists. According to John Wohlbier on 3/8/2009 12:42 AM: >> but other variations give me >> -DDBC=\$withval >> -DDBC=\$DBC >> >> AC_MSG_NOTICE([setting level of DBC to $withval]) >> AC_DEFINE(DBC, $withval) > Of course I figured it out the minute after I sent the mail. > AC_DEFINE_UNQUOTED. > I can't claim to understand exactly why, but it works. AC_DEFINE behaves as if it is part of a quoted shell here-doc (cat <<\EOF), hence things such as $ are taken literally. AC_DEFINE_UNQUOTED behaves as if it is part of an unquoted shell her-doc (cat <<EOF), so variable expansions can occur. Thus, any time you want shell expansions, you are correct that you have to use the alternate macro. Meanwhile, you are missing recommended m4 quoting; the better way to write this would be: AC_DEFINE_UNQUOTED([DBC], [$withval]) - -- 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 iEYEARECAAYFAkmz2N8ACgkQ84KuGfSFAYDpRACguJMHck6fzOvl9Obx9xHvk7lC 3T0An1CvOamTTZWBPl8CdRWRK4Sk+vm1 =837D -----END PGP SIGNATURE----- _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
