CODEWITHSUNDEEP
makefilegnu-make
user12260869
user12260869

Reputation:

how to create local variable in a rule recipe in makefile?

how to create local variable in a Makefile recipe in which only it is assignable and also just used there only ?

Upvotes: 1

Views: 410

Answers (2)

HolyBlackCat
HolyBlackCat

Reputation: 96236

You can use so-called target-specific variables:

foo: bar = 1
foo:
    @echo $(bar)

Or, if they are not flexible enough for you, consider using eval.

eval creates/manipulates global variables, so to avoid name collisions, I'd use a prefix for the variables you create with it:

foo:
    $(eval _local_bar = 1)
    @echo $(_local_bar)

Upvotes: 2

AProgrammer
AProgrammer

Reputation: 52284

The recipe is executed by the shell, usually line by line. So you'll have to use your shell definition of variables, use escape if your shell uses $ for variables, and use escapes so that the recipe is logically one line. For instance on Unix, you can do:

target: <dependencies>
        v=42 ; \
        echo $$v

Upvotes: 2

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