Re: help with $(filter ) in pattern rule prereq

[Paul D. Smith]

You cannot use functions on the results of a pattern match like that;
functions appearing in target or prerequisite lists are expanded as a
makefile is being read in, but patterns do not match until later, when
make is trying to find rules to run.

See the GNU make manual, section "How 'make' Reads a Makefile" for more
information on when expansion happens.

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