[bug #62706] Restrict second expansion to targets which are being built.

[Dmitry Goncharov]

Follow-up Comment #3, bug #62706 (project make):

Another thought on point 2 above.
Posix contains the following requirement.

"The make utility shall treat all prerequisites as targets themselves and
recursively ensure that they are up-to-date, processing them in the order in
which they appear in the rule."

Should word "processing" here be interpreted as any activity, including
secondary expansion (which posix does not define), needed to bring a
prerequisite up to date?

Secondary expansion of implicit rules in gnu make already satisfied these
requirements. This patch makes explicit and static pattern rules to satisfy as
well.



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