esp-idf/components/newlib/system_libs.lf

[mapping:gcc]
archive: libgcc.a
entries:
    lib2funcs (noflash_text)
    if IDF_TARGET_ESP32 = n:
        _divsf3 (noflash)

[mapping:gcov]
archive: libgcov.a
entries:
    * (noflash)