From d18533cc294552c39f69781e5a9b04b8882b6364 Mon Sep 17 00:00:00 2001
From: Pablo de Oliveira <pablo@sifflez.org>
Date: Mon, 17 Mar 2014 19:13:22 +0100
Subject: [PATCH] Fix userprog tests for clang

Recent clang version, detect attemps to dereference or call NULL, and
eliminate the code.

../../tests/userprog/bad-read.c:11:9: warning: indirection of
non-volatile null pointer will be deleted, not trap [-Wnull-dereference]
        *(int *) NULL);
        ^~~~~~~~~~~~~

This patchs adds the volatile modifier as necessary.
It allows to use clang to compile the tests.
---
 src/tests/userprog/bad-jump.c        | 5 ++++-
 src/tests/userprog/bad-read.c        | 2 +-
 src/tests/userprog/bad-write.c       | 2 +-
 src/tests/userprog/no-vm/multi-oom.c | 6 +++---
 4 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/tests/userprog/bad-jump.c b/src/tests/userprog/bad-jump.c
index 51b7c9f..a915c39 100644
--- a/src/tests/userprog/bad-jump.c
+++ b/src/tests/userprog/bad-jump.c
@@ -4,10 +4,13 @@
 #include "tests/lib.h"
 #include "tests/main.h"
 
+typedef int (* volatile functionptr)(void);
+
 void
 test_main (void) 
 {
+  functionptr fp = NULL;
   msg ("Congratulations - you have successfully called NULL: %d", 
-        ((int (*)(void))NULL)());
+        fp());
   fail ("should have exited with -1");
 }
diff --git a/src/tests/userprog/bad-read.c b/src/tests/userprog/bad-read.c
index 904c278..d821a9a 100644
--- a/src/tests/userprog/bad-read.c
+++ b/src/tests/userprog/bad-read.c
@@ -8,6 +8,6 @@ void
 test_main (void) 
 {
   msg ("Congratulations - you have successfully dereferenced NULL: %d", 
-        *(int *)NULL);
+        *(volatile int *) NULL);
   fail ("should have exited with -1");
 }
diff --git a/src/tests/userprog/bad-write.c b/src/tests/userprog/bad-write.c
index 000c26b..9082c9b 100644
--- a/src/tests/userprog/bad-write.c
+++ b/src/tests/userprog/bad-write.c
@@ -7,6 +7,6 @@
 void
 test_main (void) 
 {
-  *(int *)NULL = 42;
+  *(volatile int *)NULL = 42;
   fail ("should have exited with -1");
 }
diff --git a/src/tests/userprog/no-vm/multi-oom.c b/src/tests/userprog/no-vm/multi-oom.c
index 6a4472d..cd2c939 100644
--- a/src/tests/userprog/no-vm/multi-oom.c
+++ b/src/tests/userprog/no-vm/multi-oom.c
@@ -67,15 +67,15 @@ consume_some_resources_and_die (int seed)
 {
   consume_some_resources ();
   random_init (seed);
-  int *PHYS_BASE = (int *)0xC0000000;
+  volatile int *PHYS_BASE = (volatile int *)0xC0000000;
 
   switch (random_ulong () % 5)
     {
       case 0:
-        *(int *) NULL = 42;
+        *(volatile int *) NULL = 42;
 
       case 1:
-        return *(int *) NULL;
+        return *(volatile int *) NULL;
 
       case 2:
         return *PHYS_BASE;
-- 
2.30.2