compat.cpptrace

// Behavioral test — compat.cpptrace unwinds a real call stack.
//
// What is asserted is deliberately what the CHOSEN BACKENDS can answer on a
// bare CI runner. The package selects `_Unwind_Backtrace` + `dladdr` on unix
// and DbgHelp on windows, all dependency-free, and the documented cost of that
// choice is that frames carry no file:line (dladdr does not read DWARF). So
// this test asserts the unwinder — frame count and distinct return addresses —
// and never asserts on line numbers, which would be testing libdwarf's absence
// rather than this package.
#include <cpptrace/cpptrace.hpp>
#include <cpptrace/version.hpp>

#include <cstdio>
#include <cstdint>

#if CPPTRACE_VERSION != CPPTRACE_TO_VERSION(1, 0, 4)
#  error "cpptrace/version.hpp does not describe 1.0.4 — the generated header drifted from the tarball"
#endif

// The package builds objects, not a shared library, so every cpptrace
// declaration this TU sees must be plain — not dllimport, not
// visibility("default"). The package delivers that with a shim in front of
// …