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

[Steve Langasek]

Public bug reported:

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.

** Affects: glibc (Ubuntu)
     Importance: High
         Status: New

** Affects: glibc (Ubuntu Impish)
     Importance: High
         Status: New

** Affects: glibc (Ubuntu Jammy)
     Importance: High
         Status: New


** Tags: fr-1870

** Changed in: glibc (Ubuntu)
   Importance: Undecided => High

** Also affects: glibc (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Also affects: glibc (Ubuntu Jammy)
   Importance: High
       Status: New

** Changed in: glibc (Ubuntu Impish)
   Importance: Undecided => High

** Tags added: fr-1870

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https://bugs.launchpad.net/bugs/1951340

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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