ESP-SKAINET not building in C++. (AIS-1370)

[nikhil-robinson]

I was testing the esp-skainet example en_speech_commands_recognition on the esp32s3eye board the example builds fine but when i change the man.c to main.cpp i am getting some undefined reference warnings.

/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj):(.literal._Z11detect_TaskPv+0x48): undefined reference to `_Z18esp_srmodel_filterP14srmodel_list_tPKcS2_'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj):(.literal._Z11detect_TaskPv+0x4c): undefined reference to `_Z23esp_mn_handle_from_namePc'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj):(.literal._Z11detect_TaskPv+0x50): undefined reference to `_Z37esp_mn_commands_update_from_sdkconfigPK14esp_mn_iface_tP18model_iface_data_t'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj):(.literal.app_main+0x2c): undefined reference to `_Z16esp_srmodel_initPKc'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj): in function `_Z11detect_TaskPv':
/home/nikhi/disk/esp-skainet/examples/en_speech_commands_recognition/main/main.cpp:73: undefined reference to `_Z18esp_srmodel_filterP14srmodel_list_tPKcS2_'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: /home/nikhi/disk/esp-skainet/examples/en_speech_commands_recognition/main/main.cpp:74: undefined reference to `_Z23esp_mn_handle_from_namePc'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: /home/nikhi/disk/esp-skainet/examples/en_speech_commands_recognition/main/main.cpp:78: undefined reference to `_Z37esp_mn_commands_update_from_sdkconfigPK14esp_mn_iface_tP18model_iface_data_t'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: esp-idf/main/libmain.a(main.cpp.obj): in function `app_main':
/home/nikhi/disk/esp-skainet/examples/en_speech_commands_recognition/main/main.cpp:129: undefined reference to `_Z16esp_srmodel_initPKc'
/home/nikhi/idf5/.espressif/tools/xtensa-esp32s3-elf/esp-12.2.0_20230208/xtensa-esp32s3-elf/bin/../lib/gcc/xtensa-esp32s3-elf/12.2.0/../../../../xtensa-esp32s3-elf/bin/ld: /home/nikhi/disk/esp-skainet/examples/en_speech_commands_recognition/main/main.cpp:145: undefined reference to `_Z18esp_srmodel_filterP14srmodel_list_tPKcS2_'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

Is it not posible to compile in c++ ?

Idf version : ESP-IDF v5.1.1-dirty
SOC: esp32s3
sdkconfig : the default one from the example

[nikhil-robinson]

@feizi this issue is solved when manually changing the the esp-sr to the latest commit. Missing some.

#ifdef __cplusplus
extern "C" {
#endif


#ifdef __cplusplus
}
#endif

in the header files.