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Why Doesn't My Makefile Interpolate Expressions in $(())?

Susan Sarandon

Dec 30, 2024 pm 10:27 PM

Why Doesn't My Makefile Interpolate Expressions in $(())?

Makefile Interpolation Issue

When attempting to interpolate an expression within a Makefile command, it remains unevaluated. This occurs when the expression is enclosed in double curly brackets $(()).

To resolve this issue, double the dollar sign ($) within the recipe section of the Makefile. This effectively escapes the first dollar sign, allowing for proper interpolation.

Here's an example of a corrected Makefile:

test:
    go test $$(go list ./... | grep -v /vendor/)

.PHONY: test

With this modification, the expression $$(go list ./... | grep -v /vendor/) will be evaluated properly when running the make test command.

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