[PATCH] Inherit nocast modifier when referencing a variable

[PATCH] Inherit nocast modifier when referencing a variable

[Lars-Peter Clausen]

The nocast modifier should be inherited when referencing a variable, so add it
to MOD_PTRINHERIT.

E.g. without this patch the following code snippet ...

	typedef int __attribute__((nocast)) test_type;

	static void foo(test_type *a) {}

	static void bar(void)
	{
		test_type a;
		foo(&a);
	}

... incorrectly generates the following sparse warnings:

	nocast_ref.c:8:10: warning: incorrect type in argument 1 (different modifiers)
	nocast_ref.c:8:10:    expected int [nocast] [usertype] *a
	nocast_ref.c:8:10:    got int *<noident>
	nocast_ref.c:8:10: warning: implicit cast to nocast type

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
 symbol.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/symbol.h b/symbol.h
index 1e74579..c7ec35b 100644
--- a/symbol.h
+++ b/symbol.h
@@ -229,7 +229,8 @@ struct symbol {
 #define MOD_SIZE	(MOD_CHAR | MOD_SHORT | MOD_LONG_ALL)
 #define MOD_IGNORE (MOD_TOPLEVEL | MOD_STORAGE | MOD_ADDRESSABLE |	\
 	MOD_ASSIGNED | MOD_USERTYPE | MOD_ACCESSED | MOD_EXPLICITLY_SIGNED)
-#define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_STORAGE | MOD_NORETURN)
+#define MOD_PTRINHERIT (MOD_VOLATILE | MOD_CONST | MOD_NODEREF | MOD_STORAGE | \
+	MOD_NORETURN | MOD_NOCAST)
 
 
 /* Current parsing/evaluation function */
-- 
1.7.10.4