bug#26897: ‘cmake-build-system’ does not support cross-compilation

[Ricardo Wurmus]

Implemented in commit d2ac5e297578dea1c872f77a26ef4d481d5dc7bd.

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Ricardo

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bug#26897: ‘cmake-build-system’ does not support cross-compilation

[Ludovic Courtès]

Currently ‘cmake-build-system’ does not support cross-compilation, which
is becoming more and more of a problem.  For instance, it prevents
cross-compilation of Guix:

--8<---cut here---start->8---
$ guix build guix --target=aarch64-linux-gnu -n
guix build: error: gnu/packages/ssh.scm:59:2: libssh-0.7.4: build system 
`cmake' does not support cross builds
--8<---cut here---end--->8---

I think CMake supports cross-compilation in theory, so we should try to
implement it.

Ludo’.