How to add C++ file to nRF9160 project in SES

[bertiew]

Hi,

I'm not sure if SES support C++ compiler in nRF9160 project, I did add C++ source in CMakeList:

   target_sources(app PRIVATE src/xxx.cpp)

It won't work, Does anyone know?

Thanks,

Bertie

[Didrik Rokhaug]

Hi.

Did you enable C++ support using CONFIG_CPLUSPLUS and CONFIG_LIB_CPLUSPLUS?

Have you tried building from the command line (you will have to set two environment variables first: ZEPHYR_TOOLCHAIN_VARIANT=gnuarmemb and GNUARMEMB_TOOLCHAIN_PATH=<path to your toolchain install directory>)?

While C++ should be supported in NCS, I do not believe it is much tested, so you are largely on your own.

Best regards,

Didrik

[bertiew]

Thanks Didrik,

I added CONFIG_CPLUSPLUS=y and CONFIG_LIB_CPLUSPLUS=y in prj.conf

built it on Window SES. Project can be built but just not compile the .cpp file which is in CMakeLists.

what I tested is to use "hello world" in zephyr\samples\hello_world:

    changed src/main.c to src/main.cpp, also in CMakeLists

    added CONFIG_CPLUSPLUS=y and CONFIG_LIB_CPLUSPLUS=y in prj.conf

    Loaded project into SES, and the main.cpp is not in Project 'app/libapp.a' list, but main.c was there before modification:

    

build and run on nRF9160 DK board won't print "hello world" on terminal as main.c build does.

Did I miss something?

Thanks

[Didrik Rokhaug]

I just tried myself, and it does indeed look like SES has some problems with C++.

However, the attached project worked fine when building from the command line.

hello_world_cpp.zip

Note that I had to disable (or rather, not set) CONFIG_LIB_CPLUSPLUS to make it compile.

[bertiew]

Command line works, thank you.

do you know what is the problem of SES with C++? Command line build is not so convenient for us. 

[Didrik Rokhaug]

Hi, and sorry for the slow response.

We do not have official C++ support in any of our SDKs, so you are mostly on your own here.

Best regards,

Didrik

[Nguyen Hoan Hoang]

SES stripped out most of the header files for C++ from GCC. hence does not compile C++ code.  You need to use external full GCC for that.