Using C++ std::exceptions

[ibboliver]

I use Zephyr 2.6.99 with the nRF Connect SDK and try to use C++ Exceptions. I set the following configs:

CONFIG_CPLUSPLUS=y
CONFIG_LIB_CPLUSPLUS=y
CONFIG_NEWLIB_LIBC=y
CONFIG_EXCEPTIONS=y
CONFIG_NEWLIB_LIBC_NANO=n.

This results in a linker error undefined reference to '_fini'. Uncommenting CONFIG_NEWLIB_LIBC_NANO=n leads to a warning that CONFIG_EXCEPTIONS is set to 'n' because of unsatisfied dependencies (!NEWLIB_LIBC_NANO). In this case the code is being compiled but thrown exceptions are not catched. Instead of running the catch-path the code is running into _exit in libc-hooks.c which is part of newlib. So, does anybody know how to enable the exception support? Am I missing some more CONFIGs?

[ibboliver]

For those that might run into the same issue, here's my solution, inspired by https://community.infineon.com/t5/DAVE/Undefined-reference-to-fini/m-p/302777/highlight/true#M2150

I set the C++ and exceptions related config stuff:

CONFIG_CPLUSPLUS=y
CONFIG_LIB_CPLUSPLUS=y

CONFIG_NEWLIB_LIBC=y
CONFIG_EXCEPTIONS=y
CONFIG_NEWLIB_LIBC_NANO=n

To prevent the linker error, I implemented exit() by myself :

void exit(int reason) {
  printf("EXIT %d", reason);
  while (1)
    ;
}

Now the code compiles without error and the handled exceptions are being catched. Unhandled exceptions are running into exit().