Is it possible to set Environment variables in Makefile - to be used after

Question

I am trying to set an Environment variable in a Makefile, so it can be used in another program running in the sam shell as make, but after make ha

Answer 1

Your export TEST_ENV_ONE=OneString above is running in a dedicated shell. The subsequent commands run in other shell instances. Therefore, they don't inherit the environment variable TEST_ENV_ONE.

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You could use a top-level (i.e., not in a target's recipe) export directive in the makefile:

export env_var := MyEnvVariable

.PHONY: all
all:
    echo env_var: $$env_var

This way, the variable env_var is exported to the shells that will execute the recipes.

If you run make with the makefile above:

$ make
echo env_var: $env_var
env_var: MyEnvVariable

As you can see from the output, the shell that run echo env_var: $env_var had the variable env_var in its environment.