Without being too clever, here's an SSCCE:
define VAR
$(foreach item, foo bar, $(shell echo $(item)>>foobar.txt))
endef
foobar:
$(VAR)
You see that VAR is expanded during the "first pass" of make, and it's value is
nothing, but, I am relying on it's side effects to echo things to a file. So I
care, that the invocations of echo, are in order, and wait for each other to
finish.
I guess what you are saying is, the (first pass of) make is serial. And in the
manual it says, that make waits for the end of the shell function to collect
the output of the shell.
So that would mean, the above example should behave as expected.
The reason why I was asking, is I see in one of my users, a rather bizarre
effects, which would be consistent with the above shell invocations executed
"in parallel" and/or not "in order". So I think I should look for another
explanation?
Mark
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