On 11/26/06, Brian Lewis <[EMAIL PROTECTED]> wrote:
I'd like a user-defined function to say x="M"$(N), increment N, and return x. I know how to write user-defined functions, but I don't understand how they can cause side effects like the incrementing of the variable N. In case it isn't clear, this function would return M0 the first time, M1 the second time, etc. User-defined functions in make seem functional. Maybe I can use semicolons? Is the value of a function the value of its last expression? Thanks.
Here are two alternatives to what you came up with if you are still interested. The first one requires Lua support which is provided by the patches posted here. http://lists.gnu.org/archive/html/help-make/2006-10/msg00018.html The second requires GNU bc. The advantage of the first is that there will be no fork/exec for the shell process. This may matter if you call the macro repeatedly. The advantage of the second is that it will work with unpatched GNU make. First Solution x := 1 N := 1 $(info x = $(x)) $(info N = $(N)) generate-module-name = \ $(strip \ $(eval x := M$(N)) \ $(eval N := $(lua printmake($(N) + 1))) \ $(x) \ ) $(info generate-module-name result = $(generate-module-name)) $(info x = $(x)) $(info N = $(N)) Second Solution x := 1 N := 1 $(info x = $(x)) $(info N = $(N)) generate-module-name = \ $(strip \ $(eval x := M$(N)) \ $(eval N := $(shell echo $(N) + 1|bc)) \ $(x) \ ) $(info generate-module-name result = $(generate-module-name)) $(info x = $(x)) $(info N = $(N)) Ken Smith _______________________________________________ Help-make mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-make
