Jonathan Gray <j...@jsg.id.au> writes:
> commit a6a38a038bd62e6d9558905f00bef81b5e7e6fcc
> Author: Grazvydas Ignotas <nota...@gmail.com>
> Date: Fri Mar 31 01:26:25 2017 +0300
>
> util/u_atomic: provide 64bit atomics where they're missing
>
> attempts to handle powerpc like situations, though not sync
> builtins being missing entirely.
Not ready for Clang on i386 which has __sync* but not __atomic*.
Teaching configure.ac about 64bit __atomic* isn't enough.
#include <stdint.h>
uint64_t v;
int main() {
#ifdef USE_GCC_ATOMIC_BUILTINS
return __atomic_add_fetch(&v, 1, __ATOMIC_ACQ_REL);
#else
return __sync_add_and_fetch(&v, (uint64_t)1);
#endif
}
leads to
u_atomic.c:38:1: error: conflicting types for '__sync_add_and_fetch_8'
__sync_add_and_fetch_8(uint64_t *ptr, uint64_t val)
^
u_atomic.c:38:1: note: '__sync_add_and_fetch_8' is a builtin with type 'long
long (volatile long long *, long long, ...)'
u_atomic.c:38:1: error: definition of builtin function
'__sync_add_and_fetch_8'
__sync_add_and_fetch_8(uint64_t *ptr, uint64_t val)
^
u_atomic.c:51:1: error: conflicting types for '__sync_sub_and_fetch_8'
__sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
^
u_atomic.c:51:1: note: '__sync_sub_and_fetch_8' is a builtin with type 'long
long (volatile long long *, long long, ...)'
u_atomic.c:51:1: error: definition of builtin function
'__sync_sub_and_fetch_8'
__sync_sub_and_fetch_8(uint64_t *ptr, uint64_t val)
^
u_atomic.c:64:1: error: no previous prototype for function
'__atomic_fetch_add_8' [-Werror,-Wmissing-prototypes]
__atomic_fetch_add_8(uint64_t *ptr, uint64_t val, int memorder)
^
u_atomic.c:70:1: error: no previous prototype for function
'__atomic_fetch_sub_8' [-Werror,-Wmissing-prototypes]
__atomic_fetch_sub_8(uint64_t *ptr, uint64_t val, int memorder)
^
6 errors generated.
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