Improve compiler detection

[galpeter]

In some Linux systems the x86_64 compiler is not named x86_64-linux-gnu-gcc, but instead x86_64-unknown-linux-gnu-gcc. Related to this that it is also possible that there is no x86_64-linux-gnu-strip just the simple strip program.

[galpeter]

Maybe one solution would be the following: galpeter@57741b3

[egavrin]

Can we close this issue?

[galpeter]

There is one minor issue leftover: If we cross-compile to x86_64 then it is possible that the line

find_program(CMAKE_STRIP NAMES x86_64-linux-gnu-strip x86_64-unknown-linux-gnu-strip strip)

in the build/configs/toolchain_linux_x86_64.cmake file would make the CMAKE_STRIP to use the default strip binary, which could be incorrect for the given target, as the strip would be for the host.

[egavrin]

Fixed. Leftover issue should be fixed at #221