This separator:
+# #--Extract step --------------
should not be there because EXTRACT_COMMAND is actually an option
of the download step. There is no separate timestamp-managed
extraction step.
In fact, *all* the other *_COMMAND parameters to ExternalProject_Add
yield a time-stamp managed "step".... If the name of this parameter is
EXTRACT_COMMAND, then I would strongly suggest conforming to the
existing pattern, and making "extract" be a full-fledged separate step.
If you don't think that's appropriate, then I would suggest using a
different name than EXTRACT_COMMAND.
I think it's good to maintain as much consistency as possible.
Especially given the sheer number of possible parameters to
ExternalProject_Add.
David C.
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