Looks like meson.build doesn’t create and substitute G_MODULE_LDFLAGS like configure.ac does, so gmodule-export-2.0.pc ends up without the all-important -Wl,--export-dynamic flag.

Here’s the gmodule-export-2.0.pc file as generated by autotools:

prefix=/opt/gnome/install
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

gmodule_supported=true

Name: GModule
Description: Dynamic module loader for GLib
Requires: glib-2.0
Version: 2.55.0
Libs: -L${libdir} -Wl,--export-dynamic -lgmodule-2.0 -pthread
Libs.private: -ldl
Cflags: -pthread

---

And for completeness here’s gmodule-no-export-2.0.pc:

prefix=/opt/gnome/install
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

gmodule_supported=true

Name: GModule
Description: Dynamic module loader for GLib
Requires: glib-2.0
Version: 2.55.0
Libs: -L${libdir} -lgmodule-2.0 -pthread
Libs.private: -ldl
Cflags: -pthread

---

Probably best to check through the rest of the .pc files too. Let me know if you need me to provide copies.