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x/build: linux-arm-arm5spacemonkey persistently broken #29177
As far as I can tell, it's a configuration issue: for some reason the builder sets the Go version to
For the record, if I remembered correctly, that builder is special in that it does cross compilation. The toolchain and the standard library is built on AMD64 machine(s) then shipped to the ARMv5 machine(s) to run the tests. When @rsc implemented the build cache, it would never work in this setting (failure was probably toolchain2 and toolchain3 were different). (And it is not possible to run everything on the ARMv5 machine because it is too slow.) So we decided to set up a toolchain version, to bypass certain checks.