On 15 September 2015 at 08:13, Peter Johansson <trojkan@xxxxxxxxx> wrote:
> I need to to extract the value of ${datadir} so I can use it something like
>
> val=*extract ${datadir}*
>
> AC_CHECK_FILE([$val], [], [AC_MSG_ERROR([file $val needed])])
Here's what I got with
echo datadir is $datadir
eval datadir=$datadir
echo datadir is $datadir
eval datadir=$datadir
echo datadir is $datadir
in configure.ac.
Output:
datadir is ${datarootdir}
datadir is ${prefix}/share
datadir is NONE/share
That NONE is a problem. Maybe if you specify a value for datadir
explicitly it will work.
The idea was to loop with the eval's until a fixed point was reached.
The answer appears to be you can do what you want only with difficulty.
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