libc++ files version mismatch

[Marco Manino]

I just installed gcc-arm-none-eabi toolchain and I can't compile even the simplest c++ source as g++ complaints about missing headers.

If I open the header folder (/usr/include/newlib/c++/) I can see a folder name 7.3.1 which contains everything I need (apparently). However the result of the command:

  arm-none-eabi-g++ -v

tells me that g++ version is 6.3.1(2017-06-20) and not 7.3.1.

In fact creating a symlink /usr/include/newlib/c++/6.3.1 -> /usr/include/newlib/c++/7.3.1 helps the compiler find the headers, but the compilation quickly fails because of some builtins missing (in my case, __builtin_addressof).

I think there is something messed up with the dependencies, as __builtin_addressof has been implemented later than Jun 2017 (but I am not sure).

[Mike Purvis (mikepurvis)]

This was working correctly on Ubuntu Focal with gcc-arm-none-eabi (15:7-2018-q2-6) and libstdc++-arm-none-eabi-newlib (15:7-2018-q2-5+12).

However, now that gcc-arm-none-eabi is at 15:8-2019-q3-1, it's broken again. Hopefully the newlib package will get a rebuild prior to release which should correct the issues.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alistair Buxton (a-j-buxton)]

Fixed in libstdc++-arm-none-eabi-newlib 15:8-2019-q3-1+12build1

Is this still a problem for older releases? Is there anything that could be done to prevent this happening in the future?

[Mike Purvis (mikepurvis)]

Not sure about older released, but it's actually broken again already— currently in Sid, the versions of gcc-arm-none-eabi and libstdc++-arm-none-eabi are both 15:8-2019-q3-1:

https://packages.debian.org/sid/devel/gcc-arm-none-eabi
https://packages.debian.org/sid/devel/libstdc++-arm-none-eabi-newlib

However in Focal, we now have gcc-arm-none-eabi bumped ahead to 15:9-2019-q4-0ubuntu1, per:

http://changelogs.ubuntu.com/changelogs/pool/universe/g/gcc-arm-none-eabi/gcc-arm-none-eabi_9-2019-q4-0ubuntu1/changelog

But libstdc++-arm-none-eabi-newlib is still lagging at 15:8-2019-q3-1.