Vector linking errors with c++ library

[sudha_mqa]

How do we avoid this error when integrating a c++ library into the build?

```c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/vector.tcc:71: undefined reference to `std::__throw_length_error(char const*)'
c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/stl_vector.h:1905: undefined reference to `std::__throw_length_error(char const*)'
c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/stl_vector.h:1894: undefined reference to `std::__throw_length_error(char const*)'
c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/stl_vector.h:1894: undefined reference to `std::__throw_length_error(char const*)'
c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/stl_vector.h:1905: undefined reference to `std::__throw_length_error(char const*)'
c:\ncs\toolchains\v2.2.0-rc1\opt\zephyr-sdk\arm-zephyr-eabi\arm-zephyr-eabi\include\c++\12.1.0\bits/stl_vector.h:1905: undefined reference to `std::__throw_length_error(char const*)'```

[Sigurd]

Hi,

Make sure to set CONFIG_LIB_CPLUSPLUS=y

v2.2.0-rc1

PS: You are using a 2.2.0 release candidate. Please make sure to update to v2.2.0

[sudha_mqa]

Hello, thank you- I have set `CONFIG_CPLUSPLUS=y` in the prj.conf.

I am also using the 2.2.0 toolchain, the directory path is just incorrect- you can see that it is in fact picking up the correct toolchain: `Using NCS Toolchain 2.2.0 for building. (C:/ncs/toolchains/v2.2.0-rc1/cmake)`

I wonder if there is another way I could incorporate my c++ library? So that it can be compiled with all the same compiler flags as the rest of the application? Or could the entire build be compiled with c++?

Have tried multiple options and stuck at the moment

[Sigurd]

Hmm, try to set this as well:

CONFIG_EXCEPTIONS=y

[sudha_mqa]

In order to add CONFIG_EXCEPTIONS I inherently had to also change 

CONFIG_LIB_CPLUSPLUS=y. This may have done the trick I am testing it out.

Thank you!