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use legacy atomics on gcc < 5 #893

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Nov 12, 2021
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use legacy atomics on gcc < 5 #893

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6 changes: 3 additions & 3 deletions src/libbson/src/bson/bson-atomic.h
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Original file line number Diff line number Diff line change
Expand Up @@ -47,15 +47,15 @@ enum bson_memory_order {
#define MSVC_MEMORDER_SUFFIX(X)
#endif

#if defined(USE_LEGACY_GCC_ATOMICS) || (!defined(__clang__) && \
__GNUC__ == 4 && __GNUC_MINOR__ >= 1 && __GNUC_MINOR__ < 9)
#if defined(USE_LEGACY_GCC_ATOMICS) || \
(!defined(__clang__) && __GNUC__ == 4)
#define BSON_USE_LEGACY_GCC_ATOMICS
#else
#undef BSON_USE_LEGACY_GCC_ATOMICS
#endif

/* Not all GCC-like compilers support the current __atomic built-ins. Older
* GCC (pre-4.9) used different built-ins named with the __sync prefix. When
* GCC (pre-5) used different built-ins named with the __sync prefix. When
* compiling with such older GCC versions, it is necessary to use the applicable
* functions, which requires redefining BSON_IF_GNU_LIKE and defining the
* additional BSON_IF_GNU_LEGACY_ATOMICS macro here. */
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