https://bugs.llvm.org/show_bug.cgi?id=50219
Bug ID: 50219
Summary: Unable to use regular NULL as initializer for atomic
function pointer in C
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
$ cat test-atomic.c
typedef void (*fp)(void);
_Atomic fp ptr1 = ((void(*)(void))0);
_Atomic fp ptr2 = ((void*)0);
$ gcc -c test-atomic.c -Wall -Wextra
$ clang -c test-atomic.c
test-atomic.c:3:19: error: initializer element is not a compile-time constant
_Atomic fp ptr2 = ((void*)0);
^~~~~~~~~~
1 error generated.
When initiailizing an _Atomic function pointer, which is a pointer to a
function, clang errors out when initializing it to the common NULL define
(which often expands to ((void*)0) in C). Using 0 cast to the right function
pointer type works.
GCC accepts the construct without warnings.
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