Re: Caching pkgdatadir in configure

[Mike Frysinger]

On Wednesday 14 October 2009 10:46:17 Alberto Luaces wrote:
> Alberto Luaces writes:
> > Mike Frysinger writes:
> >> On Wednesday 14 October 2009 07:37:33 Alberto Luaces wrote:
> >>> Is it possible to do what I want?
> >>>
> >>> 1. If pkgdatadir is not specified at configure time, follow the FHS or
> >>> GNU guidelines.
> >>> 2. If pkgdatadir is specified, store its value in the configure cache.
> >>
> >> a lot of people muck around with path vars in configure when they
> >> shouldnt. their code tends to be pretty fragile as they have to check
> >> multiple vars and expand them manually.
> >>
> >> what i do is append the CPPFLAGS in the configure.ac like so:
> >> CPPFLAGS=$CPPFLAGS' -DMY_DATA_PATH="\"$(pkgdatadir)\""'
> >
> > This is a great idea, thank you. I also think that the simpler the
> > configure.ac, the better.
> 
> Ooops, I read too fast. I thought that you were recommending me to
> define MY_DATA_PATH in the configure call:
> 
> configure CPPFLAGS='-DMY_DATA_PATH="\"$(pkgdatadir)\""'
> 
> Luckily it also works, since MY_DATA_PATH is defined twice but the
> compiler chooses the last definition, which belongs to the CPPFLAGS
> value. It's a great thing for the Autotools that the user configuration
> prevails over the developer's :)

if you use the line i mentioned in the configure.ac, then you can change the 
default path via the normal --foodir= configure options, or doing:
make clean
make pkgdatadir=/foo

since the pkgdatadir is expanded at the make level, you dont need to re-run 
configure.

i'm not entirely sure what you're trying to do, but i guess as long as you 
found something that makes you happy it doesnt matter too much
-mike

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