[Bug 1737608] Re: RPATH no longer respected for indirect dependencies

[Olivier BARTHELEMY]

I seem to have a similar issue since I started testing Ubuntu 18.

I have myapp -> mylib -> libQt5Gui.so -> libpng.so -> libz.so.1
The qt lib has an explicit link on the command line.
The 2 last libraries can be found in the same folder, so i used to add -rpath-link to that folder to make them found at link time without storing that path in the binaries (gcc 4.8 / ld 2.24).

With gcc 7 / ld 2.30 of ubuntu 18.04, libpng seems found, but libz cannot be resolved.
LD_DEBUG=libs shows that a libz from the system is found at some point during the build, but that's not the one i want, and the linker does not seem happy with it anyways.

Here too, adding that folder to LD_LIBRARY_PATH makes the link succeed.

Has there been any search on the issue?

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Title:
  RPATH no longer respected for indirect dependencies

Status in glibc package in Ubuntu:
  New

Bug description:
  Regression from Ubuntu 16.04 to Ubuntu 17.10.

  I am building a binary with a hard-coded RUNPATH, pointing to the
  location of some vendor-supplied shared libraries.

  $ readelf -d /home/steve/src/krx/tests/krx.test | grep RUNPATH
   0x000000000000001d (RUNPATH)        Library runpath: [../library]

  On Ubuntu 16.04 the RUNPATH allowed us to locate the libraries.

  $ ldd ./krx.test
      ...
      libinisafeNet.so => ../library/libinisafeNet.so (0x00007f35c7754000)
      libiniCore.so => ../library/libiniCore.so (0x00007f35c5bea000)
      libiniPKI.so => ../library/libiniPKI.so (0x00007f35c5952000)
      libiniCrypto.so => ../library/libiniCrypto.so (0x00007f35c56e6000)

  On Ubuntu 17.10 it no longer works

  $ ldd ./krx.test
      ...
      libinisafeNet.so => ../library/libinisafeNet.so (0x00007fb4acc38000)
      libiniCore.so => not found
      libiniPKI.so => not found
      libiniCrypto.so => not found

  Note that setting LD_LIBRARY_PATH does allow the libraries to be found

  $ export LD_LIBRARY_PATH=../library
  $ ldd ./krx.test 
      ...
      libinisafeNet.so => ../library/libinisafeNet.so (0x00007fa787659000)
      libiniCore.so => ../library/libiniCore.so (0x00007fa785a86000)
      libiniPKI.so => ../library/libiniPKI.so (0x00007fa7857ee000)
      libiniCrypto.so => ../library/libiniCrypto.so (0x00007fa785582000)

  -------------------

  >> LD_DEBUG for Ubuntu 16.04 <<

  I set LD_DEBUG=all and ran ldd against my binary.

  Here is an excerpt for libiniCore.so:

   30438:     file=libiniCore.so [0];  needed by ../library/libinisafeNet.so [0]
   30438:     find library=libiniCore.so [0]; searching
   30438:      search path=../library/tls/x86_64:../library/tls:../library/x86_64:../library          (RPATH from file ./krx.test)
   30438:       trying file=../library/tls/x86_64/libiniCore.so
   30438:       trying file=../library/tls/libiniCore.so
   30438:       trying file=../library/x86_64/libiniCore.so
   30438:       trying file=../library/libiniCore.so
  The library is successfully located, and as can be seen from the search path section, it is using RPATH from file ./krx.test.

  -------------------

  >> LD_DEBUG for Ubuntu 17.10 <<

  I set LD_DEBUG=all and ran ldd against my binary.

  Here is an excerpt for libiniCore.so: (it now uses the system search
  path, not the krx.test RPATH)

   20027:     file=libiniCore.so [0];  needed by ../library/libinisafeNet.so [0]
   20027:     find library=libiniCore.so [0]; searching
   20027:      search cache=/etc/ld.so.cache
   20027:      search path=/lib/x86_64-linux-gnu/tls/haswell/x86_64:/lib/x86_64-linux-gnu/tls/haswell:/lib/x86_64-linux-gnu/tls/x86_64:/lib/x86_64-linux-gnu/tls:/lib/x86_64-linux-gnu/haswell/x86_64:/lib/x86_64-linux-gnu/haswell:/lib/x86_64-linux-gnu/x86_64:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu/tls/haswell/x86_64:/usr/lib/x86_64-linux-gnu/tls/haswell:/usr/lib/x86_64-linux-gnu/tls/x86_64:/usr/lib/x86_64-linux-gnu/tls:/usr/lib/x86_64-linux-gnu/haswell/x86_64:/usr/lib/x86_64-linux-gnu/haswell:/usr/lib/x86_64-linux-gnu/x86_64:/usr/lib/x86_64-linux-gnu:/lib/tls/haswell/x86_64:/lib/tls/haswell:/lib/tls/x86_64:/lib/tls:/lib/haswell/x86_64:/lib/haswell:/lib/x86_64:/lib:/usr/lib/tls/haswell/x86_64:/usr/lib/tls/haswell:/usr/lib/tls/x86_64:/usr/lib/tls:/usr/lib/haswell/x86_64:/usr/lib/haswell:/usr/lib/x86_64:/usr/lib            (system search path)
   20027:       trying file=/lib/x86_64-linux-gnu/tls/haswell/x86_64/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/tls/haswell/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/tls/x86_64/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/tls/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/haswell/x86_64/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/haswell/libiniCore.so
   20027:       trying file=/lib/x86_64-linux-gnu/x86_64/libiniCore.so
   ...          ...
   20027:       trying file=/lib/x86_64/libiniCore.so
   20027:       trying file=/lib/libiniCore.so
   20027:       trying file=/usr/lib/tls/haswell/x86_64/libiniCore.so
   20027:       trying file=/usr/lib/tls/haswell/libiniCore.so
   20027:       trying file=/usr/lib/tls/x86_64/libiniCore.so
   20027:       trying file=/usr/lib/tls/libiniCore.so
   20027:       trying file=/usr/lib/haswell/x86_64/libiniCore.so
   20027:       trying file=/usr/lib/haswell/libiniCore.so
   20027:       trying file=/usr/lib/x86_64/libiniCore.so
   20027:       trying file=/usr/lib/libiniCore.so

  So it seems the behaviour of ld has changed, and since it is an
  indirect dependency (krx.test --> libinisafeNet.so --> libiniCore.so)
  the RPATH for krx.test is no longer used.

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