[Bug 1932333] Re: Cannot link gvplugin_core without on-demand loading

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: graphviz (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1932333

Title:
  Cannot link gvplugin_core without on-demand loading

Status in graphviz package in Ubuntu:
  Confirmed

Bug description:
  Attempting to compile code that calls `gvContextPlugins(args)` results
  in undefined references in libgvplugin_core.so. This occurs only on
  Ubuntu 20.04 as far as I can tell, and is causing some problems with
  Regina (see https://github.com/regina-normal/regina/issues/70).

  A sample main.c and Makefile can be viewed at
  https://gist.github.com/WPettersson/014bb43f5063e06742ca06666c1b81d1

  Compiling on Ubuntu 20.04 with latest graphviz installed results in

  gcc main.c -o main -lcgraph -lgvc -lgvplugin_core -lgvplugin_dot_layout -lgvplugin_neato_layout -I/usr/include/graphviz -L/usr/lib/x86_64-linux-gnu/graphviz -DLIBGVC_DYNAMIC_PLUGINS
  gcc main.c -o main -lcgraph -lgvc -lgvplugin_core -lgvplugin_dot_layout -lgvplugin_neato_layout -I/usr/include/graphviz -L/usr/lib/x86_64-linux-gnu/graphviz
  /usr/bin/ld: /usr/lib/x86_64-linux-gnu/graphviz/libgvplugin_core.so: undefined reference to `__exp_finite'
  /usr/bin/ld: /usr/lib/x86_64-linux-gnu/graphviz/libgvplugin_core.so: undefined reference to `__log10_finite'
  collect2: error: ld returned 1 exit status
  make: *** [Makefile:4: static] Error 1

  
  After adjusting the compile flags, this code compiles (and runs) fine on Debian buster, as well as on Gentoo and ArchLinux. 

  Ubuntu version:
  Ubuntu 20.04.2 LTS

  
  Installed relevant packages:
  libgraphviz-dev: 2.24.2-3build2
  libgvc6 2.42.2-3build3
  libgvc6-plugins-gtk 2.42.2-3build2

  What I expected to happen:
  Clean compilation

  What happened instead:
  undefined references

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