Re: Cross compile gpsd-3.20.1~dev for arm with buildroot

[Florian Kiera]

Hey Gary

Am 18.06.20 um 19:24 schrieb Gary E. Miller:

> Yo Florian!
>
> On Thu, 18 Jun 2020 09:52:11 +0200
> Florian Kiera <florian.kiera@logicway.de> wrote:
>
> > > > which causes gpsd to create the directories of
> > > > user/buildrootpath/... etc and that created directory path is
> > > > supposed to not be existing.  
> > > >           
> > > Supposed?  Depends on your build options.  
> > >         
> > Yes supposed to not be existing, from MY build options, but of cause 
> > gpsd must make a mess out of it.
> >       
> gpsd does not use STAGING_DIR, so I don't see how gpsd does anything
> with that.
>     
    It does in form of DESTDIR... Should've looked at gpsd.mk...
> # fgrep STAGING_DIR * -r
> SConstruct:    'STAGING_DIR',               # OpenWRT and CeroWrt
>
> It just passed through STAGING_DIR.
>
> scons does nothing with it either:
>
> # fgrep STAGING_DIR /usr/lib64/python3.6/site-packages/SCons/ -R
> # 
>
> So I don't see how gpsd/scons can make a mess out of it.
>
>
> > The DESTDIR/sysroot variables that
> > are given to scons might be interesting.
> >       
> Yup.  That is what they are for.  Most distros use them with gpsd.
>
> > (Check the gpsd.mk again
> > there is DESTDIR and sysroot; more about it below)
> >       
> Uh, I'll leave your software to you.
>     
    You should've atleast had a look on it. Would've safed time and
    explanation.
> > > > Still need to find out why gpsd
> > > > uses that staging directory as root and not the usual root.  
> > > >           
> > > Because you told it to?  Did you set STAGING_DIR somewhere?  
> > >         
> > I told it to install it to STAGING_DIR not to STAGING_DIR/STAGING_DIR.
> >       
> In this case, what is "it", if not buildroot?  That is not part of gpsd.
> gpsd/scons knows nothing of STAGING_DIR.
>
>

Checkout SConstruct line 2147 and line 2158. It uses "DESTDIR + str(python_libdir)" to give the install path. The problem here is that python_libdir is already an absolute path to the STAGING_DIR's python module. (in my case "/home/asterix/buildroot/buildroot-2020.05.1/output/host/lib/python2.7/") But DESTDIR should contain the root of the staging/installing directory. That for python_libdir should be shortened to "/lib/python2.7" (so it is actually possible to use it as relative install path for cross compiling and as absolute path for usual installation!).

Regards Florian