C-Smith: compile bindings and execute layout tests

This makes us fall over flat on our faces almost immediately...

.gitignore

@@ -11,3 +11,6 @@ ir.png
 
 # Output of the --dump-preprocessed-input flag.
 __bindgen.*
+
+# Generated by C-Smith
+csmith-fuzzing/platform.info

csmith-fuzzing/driver.py

@@ -10,16 +10,20 @@ csmith_command = [
     "--max-block-depth", "1",
 ]
 
+def cat(path, title=None):
+    if not title:
+        title = path
+    print("-------------------- {} --------------------".format(title))
+    run(["cat", path])
+
 def run_logged(cmd):
     with NamedTemporaryFile() as stdout, NamedTemporaryFile() as stderr:
         result = run(cmd, stdin=DEVNULL, stdout=stdout, stderr=stderr)
         if result.returncode != 0:
             print()
-            print("Error: {} exited with code {}".format(str(cmd), result.returncode))
-            print("-------------------- stdout --------------------")
-            run(["cat", stdout.name])
-            print("-------------------- stderr --------------------")
-            run(["cat", stderr.name])
+            print("Error: '{}' exited with code {}".format(" ".join(cmd), result.returncode))
+            cat(stdout.name, title="stdout")
+            cat(stdout.name, title="stderr")
         return result
 
 def run_bindgen(input, output):
@@ -33,6 +37,15 @@ def run_bindgen(input, output):
         "-I", os.path.abspath(os.path.dirname(sys.argv[0])),
     ])
 
+def run_rustc(output, test):
+    return run_logged([
+        "rustc",
+        "--crate-type", "lib",
+        "--test",
+        output.name,
+        "-o", test.name,
+    ])
+
 def main():
     print("Fuzzing `bindgen` with C-Smith...\n")
 
@@ -41,21 +54,36 @@ def main():
         print("\rIteration: {}".format(iterations), end="", flush=True)
 
         input = NamedTemporaryFile(delete=False, prefix="input-", suffix=".h")
+        input.close()
         result = run_logged(csmith_command + ["-o", input.name])
         if result.returncode != 0:
             exit(1)
 
         output = NamedTemporaryFile(delete=False, prefix="output-", suffix=".rs")
+        output.close()
         result = run_bindgen(input, output)
         if result.returncode != 0:
-            print("-------------------- {} --------------------".format(input.name))
-            run(["cat", input.name])
-            print("-------------------- {} --------------------".format(output.name))
-            run(["cat", output.name])
+            cat(input.name)
+            cat(output.name)
+            exit(1)
+
+        test = NamedTemporaryFile(delete=False, prefix="test-")
+        test.close()
+        result = run_rustc(output, test)
+        if result.returncode != 0:
+            cat(input.name)
+            cat(output.name)
+            exit(1)
+
+        result = run_logged([test.name])
+        if result.returncode != 0:
+            cat(input.name)
+            cat(output.name)
             exit(1)
 
         os.remove(input.name)
         os.remove(output.name)
+        os.remove(test.name)
 
         iterations += 1