Why Doesn't My Makefile Interpolate Expressions in $(())?
Posted on 2025-03-25
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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 $$(go list ./... | grep -v /vendor/)
.PHONY: testWith this modification, the expression $$(go list ./... | grep -v /vendor/) will be evaluated properly when running the make test command.
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