compat.libffi

// compat.libffi — behavioral test. It does not check that symbols exist; it
// builds a call frame at runtime and invokes through it, which is the only
// thing that proves the per-ABI assembly was assembled and linked correctly.
// A wrong or missing unix64.S links fine and segfaults here.

#ifdef __linux__

#include <ffi.h>

#include <dlfcn.h>
#include <cstdio>
#include <cstring>
#include <string>

namespace {

int failures = 0;

void check(bool ok, const char *what)
{
    std::printf("%-58s %s\n", what, ok ? "ok" : "FAILED");
    if (!ok) ++failures;
// …