On Fri, 2015-07-03 at 08:52 +0300, Dmitry Bogatov wrote: > > > This patch integrate them a little deeper. And, by the way (VAR != > ls > > > -A) assignment is very like this. > > The following two assignments is same: > > FOO != ls -A > FOO := $(shell ls -A | sed-magic)
Oh I see; you're thinking of the shorthand. I was thinking of the real functional difference between these two: != sets the value to the result of calling the shell, but the variable FOO is a recursive variable not a simple variable. So for example: BAR = before BANG != echo '$$(BAR)' BAR = after all: ; @echo 'BANG = $(BANG)' will output: BANG = after However, even though != actually implements a capability that you can't quite achieve using other GNU make abilities, I really only added != to GNU make to enable that syntax to be added to the next POSIX standard definition for make. If it hadn't been for that requirement I'm not sure I would have added it. _______________________________________________ Bug-make mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-make
