On Wed, Jul 21, 2010 at 1:28 AM, Edward Welbourne <e...@opera.com> wrote:
> > previous_var: > > echo $(VAR) > previous_var > > .PHONY: previous_var > > I suggest you eliminate this .PHONY - previous_var is a real file on > disk, so not a phony target. There might be a case for it to be > declared .PHONY in an *else* clause, when PREVIOUS_VAR agrees with > VAR. > The .PHONY forces make to update the file, even though it has no dependencies and would otherwise be considered up-to-date. > > > /source/test $ make VAR=abc > > cat: previous_var: No such file or directory > > I suggest > PREVIOUS_VAR := $(if $(wildcard previous_var),$(shell cat previous_var),) > to avoid that one, or simply > PREVIOUS_VAR := $(shell cat previous_var 2>/dev/null) > True. I was trying to keep the example fairly simple, and ensure that the $(wildcard ) didn't mess up the directory cache as other bugs suggest might happen. > > Not that I expect either of these to fix your problem (albeit the > first might) ! > > Eddy. > Thanks for taking a look! - Geoff
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