compat.libseat

// compat.libseat — link and entry-point test.
//
// WHAT THIS CANNOT DO, and why that is not a gap. Opening a seat needs either
// a running seatd daemon (SEATD_SOCK) or the privileges to BE the seat manager
// — a CI runner has neither, and a compositor's own failure to open a seat is
// an environment problem rather than a packaging one. So what is asserted is
// that the library is complete and its entry points resolve.
//
// `#include <libseat.h>` INSIDE `extern "C"`, and that is not boilerplate:
// upstream's header carries no `extern "C"` guard of its own (measured — zero
// occurrences in include/libseat.h). Included plainly from C++ every
// declaration gets C++ linkage and every call fails to link with a mangled
// name. Any C++ consumer has to do this; it is worth having in the test so the
// requirement is visible rather than discovered.

#ifdef __linux__

extern "C" {
#include <libseat.h>
}

#include <cstdio>
// …