%% "Sandeep Nema" <[EMAIL PROTECTED]> writes: sn> has been set in any way, including to the empty value
OK. sn> You mentione in your previous answer that "?:" is not supported sn> syntax, shouldn't it give any kind of error if its used in the sn> makefile. Just because the syntax doesn't do the same thing it does in other makes, doesn't mean that it's not legal syntax in GNU make. ps> Since you didn't specify exactly what behavior "?:" provides I ps> can't say for sure, but look up the ?= assignment operator in the ps> GNU make manual. sn> X = $(EX_X?:ADD_X)) sn> if EX_X is NOT defined, X = ADD_X sn> else X contains an empty value. Yes, but as I mentioned you didn't specify what "defined" means (your reply above makes it clear now). The only way to do exactly the above is using if statements. You can combine them with call, eval, etc. to define your own macro to make it slightly easier for the user, if you use this syntax a lot. The ?= operator will do what you want if you're trying to define a variable to a value if it itself doesn't have one, but it won't help if you're trying to define a variable to a value if some other variable doesn't have one. -- ------------------------------------------------------------------------------- Paul D. Smith <[EMAIL PROTECTED]> Find some GNU make tips at: http://www.gnu.org http://make.paulandlesley.org "Please remain calm...I may be mad, but I am a professional." --Mad Scientist _______________________________________________ Bug-make mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/bug-make
