Build static library

makefile

libfoo.a: $(OBJ)
	ar rcs $@ $^

Explanation

Common for C/C++ libraries.

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Same sheet · prioritizing Archives and libraries

Use `$?` to add only changed prerequisites.

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Compile any `.c` file into a matching `.o` file.

Expand to the current target file.

Expand glob patterns during parsing.

Have the compiler emit `.d` files while building objects.

Build objects into a separate output directory.