[bug #27714] expansion of $(shell) in target forces serialization of targets

[Paul D. Smith]

Follow-up Comment #7, bug #27714 (project make):

I'm surprised you say you can do this with BSD make; I'm not aware that BSD
make has any feature like the $(shell ...) function, that can appear inside a
recipe.  What syntax do you use for this in BSD make?

We can't expand the recipe in a forked version of GNU make, because the
expansion of the recipe can have side-effects (for example, if an $(eval ...)
is expanded); if the expansion happens in a forked process then those side
effects are not available in the parent.

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