Adjust comments about what's needed to avoid make 3.80 bug.
... based on further tracing through that code.
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@ -559,9 +559,10 @@ endif
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# This function is only for internal use below. It should be called
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# using $(eval). It will set up a target so that it recurses into
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# a given subdirectory. Note that to avoid a nasty bug in make 3.80,
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# it is important that the expansion of this function not exceed about
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# 200 bytes. This is why we make it apply to just one subdirectory at a
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# time, rather than to a list of subdirectories.
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# this function has to avoid using any complicated constructs (like
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# multiple targets on a line) and also not contain any lines that expand
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# to more than about 200 bytes. This is why we make it apply to just one
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# subdirectory at a time, rather than to a list of subdirectories.
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# $1: target name, e.g., all
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# $2: subdir name
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# $3: target to run in subdir, usually same as $1
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