C++ standard-library objects are statically selected by the official ESP-IDF
xtensa-esp-elf GCC 14.2.0 (esp-14.2.0_20241119) linker from libstdc++.a.
GPLv3 plus GCC Runtime Library Exception 3.1; license texts included here.
The compiler/library download source and version are pinned by tools/setup_toolchain.sh
and ESP-IDF v5.4 tools/tools.json. No C++ runtime is assumed in VMU Pro firmware.
