From: Nicolai Stange <nicstange@xxxxxxxxx>
As an extension, GCC allows labels to be referenced a la
label1:
...
void *ptr = &&label1;
Tag these label references as being address constants allowing them
to be used as initializers for objects of static storage duration.
Signed-off-by: Nicolai Stange <nicstange@xxxxxxxxx>
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
expression.c | 1 +
validation/constexpr-labelref.c | 14 ++++++++++++++
2 files changed, 15 insertions(+)
create mode 100644 validation/constexpr-labelref.c
diff --git a/expression.c b/expression.c
index 00edd1f99..241ab7bad 100644
--- a/expression.c
+++ b/expression.c
@@ -681,6 +681,7 @@ static struct token *unary_expression(struct token *token, struct expression **t
sym->ctype.modifiers |= MOD_ADDRESSABLE;
add_symbol(&function_computed_target_list, sym);
}
+ label->flags = CEF_ADDR;
label->label_symbol = sym;
*tree = label;
return token->next->next;
diff --git a/validation/constexpr-labelref.c b/validation/constexpr-labelref.c
new file mode 100644
index 000000000..15b5293ae
--- /dev/null
+++ b/validation/constexpr-labelref.c
@@ -0,0 +1,14 @@
+static void a(void)
+{
+label1:
+ ;
+ static void *b = &&label1;
+}
+
+/*
+ * check-name: label reference constness verification.
+ * check-command: sparse -Wconstexpr-not-const $file
+ *
+ * check-error-start
+ * check-error-end
+ */
--
2.12.0
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