Hello!
Ricardo Wurmus <rek...@elephly.net> skribis:
> The latest version includes C++ sources for the firmware.
> Unfortunately, our “arm-none-eabi” cross-compiler package does not
> build libstdc++, nor does it come with any of the required C++ headers
> like “cmath”.
>
> So I tried to change our “arm-none-eabi” cross-compiler packages to also
> build and install libstdc++ but failed in a multitude of ways. The end
> result is always that either the compiler fails to build (e.g. when
> enabling libstdc++ via configure flags) or that the compiler fails to
> find the header files that are included via “#include_next” directives
> (e.g. when building libstdc++ as a separate package).
>
> Could someone with GCC experience give me a hint despite my vague
> problem description?
libstdc++ itself can probably be cross-built with:
guix build libstdc++ --target=arm-none-eabi
The problem is getting a cross-g++. I suspect libstdc++ sorta relies on
having a “real” libc, which is why we normally do things like:
(let ((triplet "arm-linux-gnueabihf"))
(cross-gcc triplet
(cross-binutils triplet)
(cross-libc triplet))))
where the final ‘cross-gcc’ has C++ support.
I’m not sure if it makes sense for the board you’re targeting, but maybe
you could try building with a full-blown cross-gcc like this?
HTH,
Ludo’.
