Cannot link gvplugin_core without on-demand loading

[WP]

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

[Launchpad Janitor (janitor)]

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

[WP (wp-strudel)]

I should clarify, where I say "adjusting compile flags" I mean setting the correct -L path to the graphviz libraries, no other compile-time flags are adjusted.