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Disallow atomics during fence & WOLFSSL_NO_ATOMIC #9076

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Merged
douzzer merged 1 commit into from
Aug 9, 2025
Merged

Disallow atomics during fence & WOLFSSL_NO_ATOMIC #9076

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1 change: 1 addition & 0 deletions .wolfssl_known_macro_extras
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Original file line number Diff line number Diff line change
Expand Up @@ -756,6 +756,7 @@ WOLFSSL_MULTICIRCULATE_ALTNAMELIST
WOLFSSL_NONBLOCK_OCSP
WOLFSSL_NOSHA3_384
WOLFSSL_NOT_WINDOWS_API
WOLFSSL_NO_ATOMIC
WOLFSSL_NO_BIO_ADDR_IN
WOLFSSL_NO_CLIENT
WOLFSSL_NO_CLIENT_CERT_ERROR
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8 changes: 6 additions & 2 deletions wolfssl/wolfcrypt/wc_port.h
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Expand Up @@ -1535,8 +1535,12 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
/* use user-supplied XFENCE definition. */
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) && \
!defined(__STDC_NO_ATOMICS__)
#include <stdatomic.h>
#define XFENCE() atomic_thread_fence(memory_order_seq_cst)
#ifdef WOLFSSL_NO_ATOMIC
#define XFENCE() WC_DO_NOTHING
#else
#include <stdatomic.h>
#define XFENCE() atomic_thread_fence(memory_order_seq_cst)
#endif
#elif defined(__GNUC__) && (__GNUC__ == 4) && \
defined(__GNUC_MINOR__) && (__GNUC_MINOR__ >= 1)
#define XFENCE() __sync_synchronize()
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