-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Bruno Haible on 10/24/2008 3:28 PM: > Ralf Wildenhues wrote: >> a suggestion for a new name: AC_EVAL_IFELSE. > > There's actually two cases to consider, if you want to make it easy to use > for the developer: > - the case of a command that should be executed and logged, > - the case of a variable that contains a command that should be executed and > logged, > > If the second one is AC_EVAL_IFELSE, what would be the name of the first one > (without EVAL)? The old (undocumented and unsafe) names are AC_TRY_EVAL and AC_TRY_COMMAND. Internally, the safe variants forward to either _AC_DO_VAR(cmd) (expands to eval $cmd) or _AC_DO_TOKENS($cmd blah) (equivalent to running $cmd blah). One other thing to point out is that it AC_COMPILE_IFELSE and friends have a (currently undocumented) feature that if the first argument is empty, then it compiles the program previously built by AC_LANG_CONFTEST, and the user is responsible for calling 'rm -f conftest.$ac_ext' after the macro ends (hmm, we need to wrap that cleanup in a macro, rather than exposing $ac_ext). But that means you can build a program once, then pass it through several compile attempts, which seems like it was one of the use cases driving this conversation (for example, see my proposed patch for AC_CHECK_TYPE, http://thread.gmane.org/gmane.comp.sysutils.autoconf.patches/6073/focus=6169) What if we create and document the following macro names: AC_COMMAND_IFELSE(command with args, if-true, if-false) AC_EVAL_IFELSE(variable, if-true, if-false) where AC_EVAL_IFELSE([variable]) is shorthand for AC_COMMAND_IFELSE([eval "$variable"])? Does that solve the immediate need? - -- 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 iEYEARECAAYFAkkMjVwACgkQ84KuGfSFAYDpqACeL3kV8L1A5tdWE2GC0sRDOnbp NVUAoMB2hIZx3PlP3mbWZ2rA4R7hkjd8 =x8M4 -----END PGP SIGNATURE----- _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
