help with makefile

[ploceus]

Hi. I'm new to make.

How do I make the variable defined in shell script to be visible to the rest of makefile?

Here is a simplified makefile:
---------------------------------
aaa = mypc

all:

.PHONY: foo
foo:
var=foo1
@echo "0var is:" $(var)
@echo "1var is:" $$var
@echo "2var is:" $${var}
@echo "localhost:" $(aaa)
-------------------------------

Variable 'var' is defined as foo1 in shell script. In contrast, if I define variable 'aaa' as in the beginning, then this is visible everywhere.

Is there a way to make 'var' visible throughtout make?

Thanks

[drl]

Hi.

Make desired variables environment variables:

#!/bin/sh

# @(#) s1       Demonstrate existence of environment shell variables in make.

echo " sh version: $BASH_VERSION" >&2

cat >Makefile <<'EOF'
target:
        @ echo " Hello, world."
        @ echo var1 is $(var1)
        @ echo var2 is $(var2)
EOF

echo
echo " Makefile:"
cat Makefile

echo
echo -----
echo " Results of make:"
export var1="/media"
make

exit 0

producing:

% ./s1
 sh version: 2.05b.0(1)-release

 Makefile:
target:
        @ echo " Hello, world."
        @ echo var1 is $(var1)
        @ echo var2 is $(var2)

-----
 Results of make:
 Hello, world.
var1 is /media
var2 is

cheers, drl

[ploceus]

Thanks drl, it works...I'm using your method.

OK... So you mean there is no way to embed shell script lines within makefile to pass shell variables back to own makefile environment?
I'm aware that variables can be passed to sub-make using export.

Hi.
Make desired variables environment variables:
cheers, drl

[drl]

Hi.

If you are talking in terms of processes, a child inherits the environment from the parent, including the names and values of those variables marked as exported. A child cannot pass values back up to the parent.

If that's not substance of your question, then please provide an example of what you mean, what actually happens, and what you expect or want to happen ... cheers, drl

[sandeep t]

My requirement is same as ploceus.
But I already have a big Makefile in my clearcase vobs. So may be I can't use the method suggested by drl. to create the Makefile using shell script.
Is there any other way to achieve this ?