[bug #64016] Simplify update_goal_chain.

[Dmitry Goncharov]

Follow-up Comment #4, bug #64016 (project make):

[comment #2 comment #2:]
> I don't understand the test that was added though.  How does this test show
that both rules are run at the same time?  It seems like it would behave the
same even if they were not.

Indeed. My test was lacking necessary synchronization.

> Don't you mean something like this:

> run_make_test(q!
> hello.x::; @#HELPER# -q wait bye.x out $@
> bye.x::; @#HELPER# sleep 1 file $@
> !,
>               '-j2 hello.x bye.x', "sleep 1\nfile bye.x\nhello.x");


> ?

This is a good test.
Thanks for review and for catching this, Paul.


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