Re: gcc for embedded linux

[Alexey Neyman <stilor@att.net>]

Hi,

On 01/27/2017 05:08 AM, Thomas Schmiedl wrote:
> Hello,
>
> I'm a newbie in cross-compiling and I'm not a developer. I hope 
> someone could help me in this issue.
>
> I try to install the Python-software Octoprint (http://octoprint.org/) 
> on a mips-based router (Fritzbox) to control an USB-connected 3d-printer.
>
> I cross-compiled Python 2.7.3 for mips with this tutorial: 
> http://www.embedded-hacking.com/index.php/python-f%C3%BCr-embedded-linux-kompilieren.html 
> and installed setuptools using this Python on the router. For the 
> Octoprint installation and the additional Python-packages is a gcc 
> required on the router. But there is no available on this embedded linux.
>
> Is it possible to use this toolchain to cross compile a gcc for the 
> router (mips binary) to compile the Python-packages on the router?
You need to build a so called "cross-native" toolchain (i.e. native 
toolchain built in a cross-compiling environment). Doing this is a 
two-step process with crosstool-ng:

First, you need a "simple cross" toolchain. Apparently, you already have 
it - it is the compiler/libraries that you used for building Python. Did 
you build that toolchain yourself, or did it come with the router?

Second, the cross-native toolchain, it is a case of a "canadian cross". 
Even though crosstool-ng has a separate option for "cross-native", I'd 
recommend against using it - use more general "Canadian" as the 
toolchain type (the "cross-native" option is marked experimental - it is 
not very well tested at this time). You need to ensure that the the 
compiler for the simple cross is in the $PATH, and configure the 
toolchain with matching kernel/libc versions.

Regards,
Alexey.