Re: [ptxdist] Mesa DRI drivers path

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Mon, May 19, 2014 at 02:19:02PM +0200, Roger Karis wrote:
> while building an i568-based linux distribution with PTXdist 2014.4 we
> discovered a deployment problem involving mesalib and xorg-server.
> 
> The xorg-server package uses pkg-config during the prepare phase to
> determine the absolute path where DRI drivers are installed. The path
> is stored in the variable 'dridriverdir' in dri.pc.
> 
> In previous versions of mesalib (e.g. 8.0.3), this path variable was
> fully expanded at package preparation time (for example to
> /usr/lib/dri). In the current packaged version (10.1.0), this path is
> not fully expanded but remains relative to the install prefix (which
> is set to /usr at prepare). At install time the prefix is replaced by
> ${pcfiledir}/../.. which makes the dridriverdir relative to the
> sysroot-target folder.
> 
> When starting the xorg-server on the target, this means that the
> drivers will be loaded from an absolute path using
> .../platform-foo/sysroot-target/.... Because the drivers are located
> at /usr/lib/dri, this fails with a AIGLX dlopen() error.
> 
> The workaround we currently employ is to explicitly specify the driver
> directory (--with-dri-driverdir) during mesalib preparation, but of
> course it would be much better if there was a proper solution to this
> problem.

I think setting --with-dri-driverdir explicitly is actually the only sane
way to handle this. The problem ist that pkg-config cannot really handle
sysroot/destdir. Take look at dri.pc there is 'includedir'. That will
probably be uses as '-I$(includedir)' so it needs to bee
'$(SYSROOT)/something'. On the other hand 'dridriverdir' probably used
while installing: "... $(DESTDIR)$(dridriverdir) ..." so it must not
contain '$(SYSROOT)' as you noticed. I've come across cases where such a
variable is used both ways. This is usually where really ugly patches start
to appear. Setting "--with-dri-driverdir" with an appropriate comment is
a rather clean and simple fix in comparison.

Michael

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