Makefile rule to build with same name, but different directory

Question

I would like a rule something like:

build/%.ext: src/%.ext
    action

I have one directory of files in a folder that I want to optimize and

Answer 1

Try somethink like this:

INPUT_FILES = \
  src/a.txt   \
  src/b.txt   \

OPTIMIZED_FILES=$(patsubst src/%.ext,build/%.ext,$(INPUT_FILES))

$(OPTIMIZED_FILES): build/%.ext: src/%.txt
     optimize_command $@ $<