Re: [ptxdist] The second symbolic links are not copied to the target

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

On Thu, Jul 05, 2018 at 02:50:13PM +0200, Guillermo Rodriguez Garcia wrote:
> 2018-07-05 14:22 GMT+02:00 Michael Olbrich <m.olbrich@pengutronix.de>:
> > On Thu, Jul 05, 2018 at 01:02:47PM +0200, Alejandro Vázquez wrote:
> >> Yes. At least it gives problems with Java applications.
> >> .......
> >>  [Failed to open library /usr/lib/classpath/libjavanio.so:
> >> /usr/lib/classpath/libjavanio.so: cannot open shared object file: No such
> >> file or directory]
> >>  [Failed to open library ./libjavanio.so: ./libjavanio.so: cannot open
> >> shared object file: No such file or directory]
> >>  [Failed to open library /usr/lib/jni/libjavanio.so:
> >> /usr/lib/jni/libjavanio.so: cannot open shared object file: No such file or
> >> directory]
> >> ......
> >>
> >> It also happens with some Gstreamer plugins.
> >>
> >> (gst-plugin-scanner:252): GStreamer-WARNING **: Failed to load plugin
> >> '/usr/lib/gstreamer-1.0/libgstimxg2d.so': libGAL.so: cannot open shared
> >> object file: No such file or directory
> >
> > These libraries are broken. I expect they don't have a soname (you can
> > check that with 'readelf -d <filename>').
> >
> > You need to create the link manually with 'install_link'.
> 
> I can't talk about GStreamer but dynamic library loading in Java is a
> bit different.

This has nothing to do with GStreamer. The problem is, that libGAL.so is
missing the correct 'soname'. As a result, libgstimxg2d.so is not linked
correctly.

> There are no elf files involved. Java
> applications/libraries can request that a native library is loaded via
> the System.loadLibrary runtime API. This takes a "generic" (platform
> independent) library name, which is then "resolved" to a platform
> specific filename by the JVM. For Windows this is typically "foo" ->
> "foo.dll", and for Linux it is "foo" -> "libfoo.so".
> 
> So it seems that removing the .so links breaks all Java applications..
> 
> Can this be reconsidered?

No, install_lib is for proper versioned shared libraries. If you need extra
links, then you can add those with install_link.

Michael

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