OpenWrt add dependency to swig for U-Boot builds

[Hauke Mehrtens]

The U-Boot build for more and more SoCs is using binman by default to combine the images (SPL, U-Boot, ...). Binman is build from the U-Boot project and it needs swig to build. We have multiple patches in OpenWrt to remove this dependency from U-Boot, but it costs more and more time to revert back to the old code. We have them in sunxi and rockchip U-Boot, the Mediatek U-Boot build failed some time ago because of missing swig in build bots.

Does anyone have an opinion on this topic?

Hauke

I was just trying to update sunxi U-Boot to 2021.01 and the binman usage changed again, so it needs more adaptations. Building swig in OpenWrt tools will not be easy. We needs swig with python bindings and this version needs the python development headers to build. I would like to add swig as an official dependency to OpenWrt, we could make it depend on the target if this is possible.

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