[riot-notifications] [RIOT-OS/RIOT] cpu/esp: treat undefined reference as errors (#11246)

Gunar Schorcht notifications at github.com
Tue Mar 26 14:17:35 CET 2019


@cladmi 
Undefined references to `coap_resources_numof` and `coap_resources` in `examples/gcoap` are probably not caused by the make build system of ESP32. Such symbels are defined in other COAP applications
```
./examples/nanocoap_server
./tests/riotboot_flashwrite
./tests/nanocoap_cli
```
but not in
```
./examples/gcoap
```
On the other side, the compilation of 
```
make BOARD=arduino-due -C examples/gcoap
```
succeeds even though
```
find examples/gcoap/bin/arduino-due -type f -name '*.a' -exec nm -s {} \; | grep coap_resources
         U coap_resources
         U coap_resources_numof
```
shows that they are also undefined there ???

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