libstdc++ library missing for C++ apps in docker

[finikorg]

Some C++ library missing in docker.

https://app.shippable.com/github/zephyrproject-rtos/zephyr/runs/20996/1/console

zephyrproject-rtos/zephyr#9533

[100%] Linking CXX executable zephyr.elf
/usr/bin/x86_64-linux-gnu-ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.so when searching for -lstdc++
/usr/bin/x86_64-linux-gnu-ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.a when searching for -lstdc++
/usr/bin/x86_64-linux-gnu-ld: cannot find -lstdc++
collect2: error: ld returned 1 exit status

[galak]

@finikorg is this still an issue?

[finikorg]

@finikorg is this still an issue?

Yes, this is still valid: zephyrproject-rtos/zephyr#19507