how to programmatically generate makefile variable

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# 1  
Old 07-04-2011
how to programmatically generate makefile variable

I make to parse the release version from a text file and set the release version label into a Makefile variable. I tried:
VERSION := `grep vsn|sed -e s/[^\"]*\"// -e s/\"[^\"]*//`

but looks like make, unlike shell, literally just take the entire `grep ...` as the variable value.

Then I tried to put the shell command in:

release: forced
    export VERSION=`grep vsn|sed -e s/[^\"]*\"// -e s/\"[^\"]*//`
    echo $(VERSION)

but it seems that the "export" command does not set the $VERSION value.

How can I programmatically parse and set a makefile variable?

Thanks in advance,


Last edited by Franklin52; 07-04-2011 at 04:21 AM.. Reason: Please use code tags for code and data samples, thank you
# 2  
Old 07-04-2011
but looks like make, unlike shell, literally just take the entire `grep ...` as the variable value.
It does, but will evaluate the backticks when you use it.

but it seems that the "export" command does not set the $VERSION value.
Shell lines in a makefile are executed individually and separately. exporting something won't do a thing to any other line.
# 3  
Old 07-04-2011
Corona688, thanks for you reply. I'm kind of new to the makefile business...

You are right, if I use "echo $VERSION" under any of the rules, the "`" expression will be evaluated, and the correct version string will be printed. So, is this the correct way people do to get some contents into the makefile?

This seems kind of odd to me, because each occurrence of $VERSION will cause an evaluation of the "`" expression. This is not what I would expect the behavior for the "variable" be. Or is there a better way to do this in make?
# 4  
Old 07-04-2011
There's supposed to be a better way in GNU make, a 'simple variable', done with VAR:=`something` but it doesn't do what it says it's supposed to, and just evaluates every time.

Short of creating a makefile from template or something, I don't think so.
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