[LEDE-DEV] U-Boot v2018.01 requiring GCC6

[p.wassi at gmx.at]

Hey guys,

as of U-Boot v2018.01, the bootloader requires at least a GCC 6 based toolchain
for ARM targets [1]. Building will fail with GCCs prior to 6. (I.e. current default 5.5.0)

For the Kirkwood target, I've prepared a patch to bring it to v2018.01, but that would result
in a failed build as stated above. (Of course, when manually selecting GCC6 as compiler
everything is fine)

How can this situation be resolved?
-) Stick to U-Boot 2017.11 until GCC 6.x is the default here?
-) Is a switch to GCC6 planned in the near future?
-) Undo the changes in [1] via a local patch and check, whether GCC5 is still fine for Kirkwood?

While the bootloader may not be that important in day to day business, eventually a 'regular'
package might have a requirement for a newer compiler too...

Best,
P. Wassi

[1]:
http://git.denx.de/?p=u-boot.git;a=commit;h=6b867dabe84bae1e74e88f4af620c26cb793c4c2