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J. Nick Koston
4d7e06da0a
ESP-IDF 6.0 switched from Newlib to PicolibC. The Newlib compatibility
shim (CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY) provides thread-local
stdin/stdout/stderr and getreent() for code compiled against Newlib.
ESPHome doesn't link against Newlib-built libraries that use stdio,
so the shim is unnecessary overhead. The cost is small (a few dozen
bytes of TLS per FreeRTOS task) but there's no reason to carry it.
Users linking precompiled Newlib binaries can re-enable via:
sdkconfig_options:
CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY: "y"
