F L writes:
> Thank you very much Paul and Philip. I still need to read what you pointed
> out.
>
> What I want is very straightforward. during make/build process, I
> want to run a shell command to extract two numbers from two
> different files. If they are same(or different), then I do
> something.
>
> That is why my prototype uses echo to get the number?
>
> $(eval v1=$(shell sh -c "echo 1"))
>
I think you could do what you want with standard utilities without
resorting to $(shell).
o Make recipe to extract number from first file.
Write to intermediate file.
o Make recipe to extract number from second file.
Write to intermediate file.
o Compare two files.
For example, something like this:
extract-1 extract-2:
<command> >$@
comparison: extract-1 extract-2
if diff extract-1 extract-2 ; then
echo "Files same";
else
echo "Files differ";
fi
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