// Extern data globals via `<name> : <type> #foreign;`. Lets sx code
// reference libSystem / framework symbols (NSConcreteStackBlock,
// __stdinp, etc.) for FFI bridges. Mirrors the long-standing
// `<fn> :: (...) -> ... #foreign;` form on the function side.
//
// Cross-file dimension (PLAN-FFI step 0.10): the helper companion
// `94-foreign-global-helper.sx` ALSO declares `__stdinp : *void #foreign;`.
// Both files referencing the same extern symbol must link cleanly —
// LLVM dedupes the named global, the C linker resolves both refs to
// the one libSystem symbol.
//
// We *don't* check that the helper computes the same address — see
// issue-0037 (helper-function-scoped `@foreign_global` lowers to
// undef today). When that fixes, fold the helper's address back into
// the equality check here.

#import "modules/std.sx";
#import "1205-ffi-foreign-global-helper.sx";

__stdinp : *void #foreign;

main :: () -> s32 {
  addr_bits : u64 = xx @__stdinp;
  print("stdin extern global non-null: {}\n", addr_bits != 0);
  // Force the helper symbol to participate in linking (otherwise the
  // imported file's #foreign decl might get dropped by the
  // dead-code stripper). The actual return value is busted today
  // — see issue-0037.
  _ := stdinp_addr_present();
  print("helper file linked: true\n");
  0
}