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J. Nick Koston
cc58cffb7b
Without these flags, libsodium's sodium_memzero() falls through to the slowest fallback: a volatile byte-by-byte zeroing loop. With them, it uses memset() guarded by a weak-symbol call and inline asm memory clobber, which is significantly faster. This also improves sodium_memcmp() and sodium_compare() codegen by allowing non-volatile pointer access with weak barriers, and enables a timing-safe comparison optimization in crypto_verify. Both flags are safe for all ESPHome targets: __attribute__((weak)) and __asm__ are core GCC features supported by all toolchains (Xtensa, RISC-V, ARM, x86_64).
