How to assign or declare variable in target specific?

Question

How to assign or declare variable in target specific?

Here i had try this example.

foo = welcome

all: foo = hello
    echo $(foo)

But i get commands commence before first target. Stop.

Answer 1

You can't have a target-specific assignment and a rule definition at the same time. You have to separate them:

all: foo = hello
all:
         echo $(foo)

Your version creates a target all which has three prerequisites: foo, =, and hello.