GIGA: C++ Zephyr Hello World Sample produces multilple errors.

[mjs513]

Describe the bug
Running the C++ Hello World Zephyr example: Hello C++ worldPrint "Hello World" to the console in C++. But modified to use setup and loop yields multiple errors when compiling.

Target board + cli verbose compilation output
Target Board: Arduino GIGA R1

Verbose output - too large to paste.
Hello_world_cpp_verbose.txt

Mandatory: attach the sketch

#include <iostream>

void setup()
{
  Serial.begin(9600);
	std::cout << "Hello, C++ world! " << CONFIG_BOARD << std::endl;
}

void loop(){}

Additional context
Tried using CONFIG_CPP=y in giga config file but get errors whether using it or not.

[facchinm]

This is one of the known issues (see https://github.com/arduino/ArduinoCore-zephyr?tab=readme-ov-file#-upcoming-features -> Fix corner cases with std:: includes (like <iterator>) ) .
It looks like somehow in the last ld invocation the information about -fnoexception gets lost, so the system tries to link nonexisting stuff.
Working on a fix 🙂

[mjs513]

Just incorporated https://github.com/arduino/ArduinoCore-zephyr/pull/17/files/e653548709ed2d97f68b9cff64cf4778285e4b4f..ed1193730c31d50925f23e304bdaa413f18c6c91 change and gave it a try and fixed this issue:

�[1;32muart:~$ �[msketch
Create semaphore 0x2400ec1c
Create semaphore 0x2400ec00
[00:00:06.712,000] �[1;33m<wrn> usb_device: USB device support already enabled�[0m
setup: Hello World!
coop_thread_entry: Hello World!
setup: Hello World!
coop_thread_entry: Hello World!
setup: Hello World!

probably should test with the following commented out as well:

CONFIG_CPP=y
CONFIG_STD_CPP17=y
CONFIG_GLIBCXX_LIBCPP=y

[facchinm]

@mjs513 I think you are referring to the other issue 🙂 This one is a bit more convoluted

[mjs513]

Oops I am - sorry - got myself confused :) Too much going on

[mjs513]

Retesting with 0.3.0 shows a different error now:

  �[1;32muart:~$ �[msketch
  [00:01:32.233,000] �[1;31m<err> llext: Undefined symbol with no entry in symbol table _ZNSt8ios_base4InitC1Ev, offset 16, link section 12�[0m
  [00:01:32.233,000] �[1;31m<err> elf: Could not find symbol _ZNSt8ios_base4InitC1Ev!�[0m
  [00:01:32.233,000] �[1;31m<err> llext: Failed to link, ret -61�[0m
  Failed to load sketch, rc -61

So guess with have to leave open