can we compile MAX78000 projects with G++ instead of GCC?

[khavernathy]

I'd like to use C++ code for a project. Changing main.c to main.cpp in one of the sample projects results in a bunch of undefined reference to ... errors.

make seems to compile the definition files fine

- CC /home/x/MaximSDK/Libraries/MiscDrivers/Camera/camera.c
- CC /home/x/MaximSDK/Libraries/MiscDrivers/Camera/ov7692.c
- CC /home/x/MaximSDK/Libraries/MiscDrivers/Camera/sccb.c
- CC /home/x/MaximSDK/Libraries/MiscDrivers/PMIC/max20303.c
...

but i get

/home/x/x/x/max78000/main.cpp:334: undefined reference to `camera_start_capture_image()'

even though I'm including camera.h at the top of main.cpp.

The call to camera_start_capture_image(); is simply that. No arguments passed, no return value.

If I change the name of the definition file camera.c (located in MaximSDK files /home/x/MaximSDK/Libraries/MiscDrivers/Camera) to camera.cpp, the error goes away. But then there is a cascade of new undefined reference errors from the files that camera.cpp depends on.

[Jake-Carter]

Thanks for reporting this @khavernathy, I've just opened a PR to fix this. We were missing C++ guards in some of our display and camera files.

C++ is fully supported, and the camera drivers should compile with the PR changes.

[khavernathy]

Thanks, for what it's worth, these are all the undefined references I get when changing main.c to main.cpp and attempting to build.

Also when I wrap the relevant header file with

#ifdef __cplusplus
extern "C" {
#endif
...

as you did in the PR commits, it seems to resolve the undefined reference error on my side.

/home/x/dev/x/max78000/main.cpp:164: undefined reference to `camera_start_capture_image()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:168: undefined reference to `camera_get_image(unsigned char**, unsigned long*, unsigned long*, unsigned long*)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:209: undefined reference to `release_camera_stream_buffer()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:176: undefined reference to `get_camera_stream_buffer()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:177: undefined reference to `camera_is_image_rcv()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:216: undefined reference to `get_camera_stream_statistic()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/build/main.o: in function `transmit_capture_uart()':
/home/x/dev/x/max78000/main.cpp:297: undefined reference to `clear_serial_buffer()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:304: undefined reference to `send_msg(char const*)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:310: undefined reference to `clear_serial_buffer()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:313: undefined reference to `MXC_UART_WriteBytes(mxc_uart_regs_t*, unsigned char const*, int)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/build/main.o: in function `main':
/home/x/dev/x/max78000/main.cpp:358: undefined reference to `cnn_enable(unsigned long, unsigned long)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:361: undefined reference to `cnn_boost_enable(mxc_gpio_regs_t*, unsigned long)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:364: undefined reference to `cnn_init()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:366: undefined reference to `cnn_load_weights()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:368: undefined reference to `cnn_load_bias()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:370: undefined reference to `cnn_configure()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:378: undefined reference to `camera_init(unsigned long)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:380: undefined reference to `camera_setup(int, int, pixformat_t, fifomode_t, dmamode_t, int)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:390: undefined reference to `camera_write_reg(unsigned char, unsigned char)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:422: undefined reference to `cnn_unload(unsigned long*)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:423: undefined reference to `cnn_stop()'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:426: undefined reference to `softmax_q17p14_q15(long const*, unsigned short, short*)'
/home/x/MaximSDK/Tools/GNUTools/10.3/bin/../lib/gcc/arm-none-eabi/10.3.1/../../../../arm-none-eabi/bin/ld: /home/x/dev/x/max78000/main.cpp:413: undefined reference to `cnn_start()'