[riot-notifications] [RIOT-OS/RIOT] cpu/esp: treat undefined reference as errors (#11246)
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Tue Mar 26 16:59:50 CET 2019
CFLAGS += -ffunction-sections
which places each function in its own section seems to solve the `undefined symbol` problem during link time even though the undefined symbol and thus it's calling function remains in ELF binary
nm -u tests/lwip/bin/esp32-wroom-32/tests_lwip.elf
Thus the ESP32 linker behavior seems to be similar to that of other architectures.
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