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J. Nick Koston
4e5d1cae8d
On embedded targets (ESP32, RP2040, ESP8266), errno expands to (*__errno()) - a function call returning a pointer to thread-local storage. The compiler cannot optimize away repeated accesses since errno is treated as volatile. Cache it once into a const int local to avoid redundant calls. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
