Julien Lepiller schreef op do 03-03-2022 om 19:35 [+0100]:
> It won't work, just like it doesn't work for gcc-toolchain. When you do
> (without my patches):
> 
> guix build hello --with-c-toolchain=hello=clang-toolchain
> --target=i686-unknown-linux-gnu
> 
> it builds, but that's because --with-c-toolchain replaces "gcc"
> (and friends), but the cross package uses "cross-gcc".
> 
> guix build hello --with-c-toolchain=hello=gcc-toolchain@7
> --target=i686-unknown-linux-gnu
> 
> also builds, but uses the latest gcc instead of gcc-toolchain@7.

In that case, could this limitation be documented in

@deffn {Scheme Procedure} package-with-c-toolchain @var{package} @var{toolchain}

in the manual?  Modifying (guix transformations) to also replace
the cross-toolchain would be even better.

Greetings,
Maxime