Casting to _Bool requires a zero test rather than truncation. Also add
a new cast warning for _Bool since this is not about truncation.
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
---
expand.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/expand.c b/expand.c
index 63a9075..fcdefcb 100644
--- a/expand.c
+++ b/expand.c
@@ -92,6 +92,14 @@ void cast_value(struct expression *expr, struct symbol *newtype,
value = get_longlong(old);
Int:
+ // _Bool requires a zero test rather than truncation.
+ if (is_bool_type(newtype)) {
+ expr->value = value ? 1 : 0;
+ if (!conservative && value != 0 && value != 1)
+ warning(old->pos, "odd constant _Bool cast (%llx becomes 1)", value);
+ return;
+ }
+
// Truncate it to the new size
signmask = 1ULL << (new_size-1);
mask = signmask | (signmask-1);
--
1.7.9.5
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