Initial import of libdpf.

Co-authored-by: Cursor <cursoragent@cursor.com>

thirdparty/hedley/test/unreachable.c

@@ -0,0 +1,32 @@
+#include "../hedley.h"
+
+#if HEDLEY_HAS_WARNING("-Wcovered-switch-default")
+#  pragma clang diagnostic warning "-Wcovered-switch-default"
+#endif
+
+enum Foo {
+  FOO_BAR,
+  FOO_BAZ,
+  FOO_QUX,
+  FOO_QUUX
+};
+
+static int test_unreachable(enum Foo code) {
+  switch (code) {
+  case FOO_BAR:
+  case FOO_BAZ:
+  case FOO_QUX:
+    return 0;
+  case FOO_QUUX:
+  default:
+    HEDLEY_UNREACHABLE();
+  }
+
+  HEDLEY_UNREACHABLE_RETURN(0);
+}
+
+int main(void) {
+  test_unreachable(FOO_BAR);
+
+  return 0;
+}