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laforge has posted comments on this change. ( https://gerrit.osmocom.org/c/libosmo-pfcp/+/31760 )

Change subject: libosmo-pfcp.pc: move libosmogsm to Requires ......................................................................

Patch Set 1:

(1 comment)

Patchset:

PS1:

And indeed, the linker command while building libosmo-pfcp seems to be: […]

So in libosmoi-pfcp/Makefile.am you are

* including LIBOSMOGSM_LIBS in AM_LDFLAGS (where it doesn't belong, but let's set that aside for now) * then overriding those flags by using libosmo_pfcp_la_LDFLAGS *without* including LDFLAGS. So all other programs/libraries/targets (that don't have a prog_name_LDFLAGS) will be linked against libosmocore, but not the library itself

As a result, you have a library that depens on other librarires, but which doesn't express this dependency to the dynamic linker at runtime.

pkg-config can't fix that. pkg-config is just metadata for easy discovery of linker flags / cflags, and it has to assume the libraries are correctly linked in the first place.