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core/atomic_sync: guard by GCC >= 4.7

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The documentation states that the implementation is missing for
gcc < 4.7, but then unconditionally compiles it, overriding the
builtins.
(gcc 9 starts complaining about mismatch of declarations.)
This commit is contained in:
Kaspar Schleiser 2019-05-13 12:58:14 +02:00
parent cbc08edcd1
commit e4fcac91a1
1 changed files with 11 additions and 1 deletions
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12
core/atomic_sync.c
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@ -29,7 +29,17 @@
#include <string.h>
#include "irq.h"
#if !defined(__llvm__) && !defined(__clang__)
/* use gcc/clang implementation if available */
#if defined(__GNUC__) \
&& (__GNUC__ > 4 || \
(__GNUC__ == 4 && (__GNUC_MINOR__ > 7 || \
(__GNUC_MINOR__ == 7 && __GNUC_PATCHLEVEL__ > 0)))) \
|| defined(__llvm__) || defined(__clang__)
#define HAVE_C11_SYNC
#endif
#if !defined(HAVE_C11_SYNC)
/* GCC documentation refers to the types as I1, I2, I4, I8, I16 */
typedef uint8_t I1;
typedef uint16_t I2;