cross compilation: enable cross compilation of i386 kernel on x86-64 …

[piso77]

…hosts

Signed-off-by: Paolo Pisati paolo.pisati@canonical.com

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• If this is a bugfix. Have you checked that there is a bug report open for the issue you are trying to fix on bug reports?
  https://bugs.launchpad.net/snapcraft/+bug/1563363
• If this is a new feature. Have you discussed the design on the forum?
• Have you successfully run ./runtests.sh static?
• Have you successfully run ./runtests.sh unit?

---

Fixes: bug 1563363

[kalikiana]

Nice trick there!

Thanks for looking into this.

[kyrofa]

This doesn't just apply to the kernel though, right? Do the other build systems handle this appropriately? @kalikiana that may be a question for you.

[kalikiana]

It's only used by the kbuild plugin which the kernel plugin subclasses afair. Nothing else uses that value.

[kalikiana]

self.project.arch_triplet is used elsewhere - it may be something to consider for the future if it should be re-used in other places, I don't recall if there was a specific reason for this.

[kyrofa]

Alright, +1 then.

[sergiusens]

shouldn't this return '' instead of None?

[kalikiana]

Either one is good. But as this came up twice, I changed it to ''.

[kyrofa]

This doesn't just apply to the kernel though, right? Do the other build systems handle this appropriately? @kalikiana that may be a question for you.

[kalikiana]

It's only used by the kbuild plugin which the kernel plugin subclasses afair. Nothing else uses that value.

[kalikiana]

self.project.arch_triplet is used elsewhere - it may be something to consider for the future if it should be re-used in other places, I don't recall if there was a specific reason for this.

[kyrofa]

Alright, +1 then.

[sergiusens]

shouldn't this return '' instead of None?

[kalikiana]

Either one is good. But as this came up twice, I changed it to ''.

[sergiusens]

the types match now!