[bug #42288] limit parallelism based on available memory

[Paul D. Smith]

Follow-up Comment #3, bug #42288 (project make):

Limiting jobs based on available memory, like -l but for memory, would be
significantly less complicated than the original request of expressing how
much memory a recipe might consume and having make defer running recipes that
are too large and instead choose recipes which fit.

However, even though a "memory limit" feature is more straightforward to
implement it still has many issues that need to be resolved before it can be
implemented: primarily, how do we measure memory used (or probably more
reasonably, memory still available)?  And how to do it portably?

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