libstdc++ for cross compilers

[Ricardo Wurmus]

Hi Guix,

I’m trying to update my custom package for the Axoloti audio board,
which is not yet in Guix because it depends on bundled Java jars.  The
package includes a user interface written in Java and a cross-compiled
firmware for the board.

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?

--
Ricardo

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