Re: [ptxdist] pkg-config-wrapper

[Richard OGrady <Rich_Ogrady@grayhill.com>]

> -----Original Message-----
> From: Michael Olbrich <m.olbrich@pengutronix.de>
> Sent: Friday, October 7, 2022 10:29 AM
> To: Richard OGrady <Rich_Ogrady@grayhill.com>
> Cc: ptxdist@pengutronix.de
> Subject: Re: [ptxdist] pkg-config-wrapper
> 
> On Fri, Oct 07, 2022 at 02:43:51PM +0000, Richard OGrady wrote:
> > > On Wed, Oct 05, 2022 at 08:44:44PM +0000, Richard OGrady wrote:
> > > > Debugging a prepare stage issue so trying to understand this chunk of code in pkg-config-wrapper.
> > > >
> > > > for pkg in ${pkgs}; do
> > > >    if [[ ! " ${whitelist} " =~ " ${pkg} " && ! "${pkg}" =~ '-uninstalled' ]]; then
> > > >       echo "$(basename ${0}): warning: blocking '${pkg}': not
> > > > selected by
> > > '${PKGCONFIG_WHITELIST_SRC}'" >&${ERROR_FD}
> > > >       exit 1
> > > >   fi
> > > > done
> > > >
> > > > Where does ${whitelist} come from?  Have tried to trace this back
> > > > and best guess is it may come
> > > from ../state/${PKGCONFIG_WHITELIST_SRC}. pkgconfig .
> > > >
> > > > If this is the case, perhaps pkg-config-wrapper can't be used
> > > > during prepare as the .pkgconfig file isn't there yet?
> > >
> > > ${whitelist} is defined as PKGCONFIG_WHITELIST_HOST or
> > > PKGCONFIG_WHITELIST_TARGET depending on whether the host or cross
> > > pkgconfig is called. For example PKGCONFIG_WHITELIST_HOST is used by when the Linux kernel looks for openssl to build a host tool.
> > >
> > > These variables are filled by the .pkgconfig files from all packages
> > > that are selected in the .in file. So those are already available during the prepare stage.
> >
> > I think this is where I am having a problem.  My file
> > gstreamer2-imx.in
> > select(s) the dependency libimxdmabuffer.  My file libimxdmabuffer.in
> > only select(s) the dependency HOST_SYSTEM_PYTHON3 and its pkgconfig
> > file is empty as expected.  So the dependency libimxdmabuffer isn't in
> > PKGCONFIG_WHITELIST_TARGET when gstreamer2-imx is prepared and the
> > pkg-config-wrapper blocks it.
> >
> > From your description it seems that primary dependencies (like
> > libimxdmabuffer) are not in PKGCONFIG_WHITELIST_TARGET.  Is that the
> > case? I would think this is a common scenario so I must still be
> > missing something.
> 
> When you build gstreamer2-imx, then libimxdmabuffer should be in PKGCONFIG_WHITELIST_TARGET.
> But please note, that PKGCONFIG_WHITELIST_TARGET does not contain the ptxdist package names but
> the .pc file names without the .pc suffix.
> And the .pkgconfig of libimxdmabuffer should contain something. Is the file empty or is it not
> generated at all? What's the output of:
> 
> find platform-<your-platform>/packages/libimxdmabuffer-<version>/ -name *.pc
> 
> Replace the path with the directory that is filled by libimxdmabuffer.
> 
> Michael
> 
That is the problem.  The .pc file did not exist.  That package is a waf configure/build/install.  
To fix I needed to explicitly add --destdir to the install command.  It works now.
Thank you.

Rich OGrady