[Bug 1951340] Re: libdl.so missing in impish and jammy

[Matthias Klose]

No, nothing gets static linkage. libdl.a is an empty library:

$ ls -l /usr/lib/x86_64-linux-gnu/libdl.a
-rw-r--r-- 1 root root 8 Sep 28 01:38 /usr/lib/x86_64-linux-gnu/libdl.a

There's nothing to fix in glibc itself.  What we need to do is to
identify references to libdl.so in all Makefiles, and then just rebuild
these packages.

It's also questionable that cmake (?) is adding these dependencies
instead of just linking with -ldl ...

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Title:
  libdl.so missing in impish and jammy

Status in glibc package in Ubuntu:
  New
Status in glibc source package in Impish:
  New
Status in glibc source package in Jammy:
  New

Bug description:
  In impish and later, libc6-dev is missing the libdl.so symlink to the
  shared library, only shipping libdl.a.  Anything trying to link
  against -ldl will surprisingly get static linkage.

  I noticed this because it causes openems to FTBFS, because previously-
  built libraries have hard-coded references to the libdl.so that causes
  reverse-dependencies to fail to link:

  [ 94%] Building CXX object CMakeFiles/QCSXCAD.dir/qrc_resources.cpp.o
  /usr/bin/c++ -DGIT_VERSION=\"v0.6.2\" -DQCSXCAD_EXPORTS -DQT_CORE_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -DTIXML_USE_STL -DvtkDomainsChemistry_AUTOINIT="1(vtkDomainsChemistryOpenGL2)" -DvtkFiltersCore_AUTOINIT="1(vtkFiltersParallelDIY2)" -DvtkFiltersFlowPaths_AUTOINIT="1(vtkFiltersParallelFlowPaths)" -DvtkIOExodus_AUTOINIT="1(vtkIOParallelExodus)" -DvtkIOGeometry_AUTOINIT="1(vtkIOMPIParallel)" -DvtkIOImage_AUTOINIT="1(vtkIOMPIImage)" -DvtkIOParallel_AUTOINIT="1(vtkIOMPIParallel)" -DvtkIOSQL_AUTOINIT="2(vtkIOMySQL,vtkIOPostgreSQL)" -DvtkRenderingContext2D_AUTOINIT="1(vtkRenderingContextOpenGL2)" -DvtkRenderingCore_AUTOINIT="3(vtkInteractionStyle,vtkRenderingFreeType,vtkRenderingOpenGL2)" -DvtkRenderingFreeType_AUTOINIT="2(vtkRenderingFreeTypeFontConfig,vtkRenderingMatplotlib)" -DvtkRenderingLICOpenGL2_AUTOINIT="1(vtkRenderingParallelLIC)" -DvtkRenderingOpenGL2_AUTOINIT="1(vtkRenderingGL2PSOpenGL2)" -DvtkRenderingVolume_AUTOINIT="1(vtkRenderingVolumeOpenGL2)" -I/<<BUILDDIR>>/openems-0.0.35+git20190103.6a75e98+dfsg.1/QCSXCAD/build/QCSXCAD_autogen/include -I/<<BUILDDIR>>/openems-0.0.35+git20190103.6a75e98+dfsg.1/debian/tmp/usr/include/CSXCAD -I/usr/include/vtk-7.1 -I/usr/include/freetype2 -I/usr/lib/x86_64-linux-gnu/openmpi/include/openmpi -I/usr/lib/x86_64-linux-gnu/openmpi/include -I/usr/include/python3.9 -I/usr/include/hdf5/openmpi -I/usr/include/jsoncpp -I/usr/include/libxml2 -I/usr/include/tcl -isystem /usr/include/x86_64-linux-gnu/qt5 -isystem /usr/include/x86_64-linux-gnu/qt5/QtWidgets -isystem /usr/include/x86_64-linux-gnu/qt5/QtGui -isystem /usr/include/x86_64-linux-gnu/qt5/QtCore -isystem /usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++ -isystem /usr/include/x86_64-linux-gnu/qt5/QtXml -g -fPIC -fPIC -MD -MT CMakeFiles/QCSXCAD.dir/qrc_resources.cpp.o -MF CMakeFiles/QCSXCAD.dir/qrc_resources.cpp.o.d -o CMakeFiles/QCSXCAD.dir/qrc_resources.cpp.o -c /<<BUILDDIR>>/openems-0.0.35+git20190103.6a75e98+dfsg.1/QCSXCAD/build/qrc_resources.cpp
  make[4]: *** No rule to make target '/usr/lib/x86_64-linux-gnu/libdl.so', needed by 'libQCSXCAD.so.0.6.2'.  Stop.

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