Simple variable

makefile

CURDIR_ABS := $(shell pwd)

Explanation

`:=` is useful when you want shell commands or functions evaluated once.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Variables and assignment

Expand later when used.

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Add text to an existing variable.

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Assign only if variable is not already set.

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Pass variable values when invoking make.

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Override even a command-line assignment.

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Pass a variable into the shell environment of recipe commands.

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