cmd/link: darwin/arm linker fails to handle pc-relative relocation to _cgo_yield

[eliasnaur]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

tip

What operating system and processor architecture are you using (go env)?

darwin/arm

What did you do?

The darwin/arm builder fails with relocation errors:

https://build.golang.org/log/8d0eeee7f56708b0f629533fab76cb27729f4229

What did you expect to see?

No relocation errors

What did you see instead?

runtime.notesleep: pc-relative relocation of external symbol is not supported
runtime.notesleep: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.notesleep: pc-relative relocation of external symbol is not supported
runtime.notesleep: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.notetsleep_internal: pc-relative relocation of external symbol is not supported
runtime.notetsleep_internal: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.notetsleep_internal: pc-relative relocation of external symbol is not supported
runtime.notetsleep_internal: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.notetsleep_internal: pc-relative relocation of external symbol is not supported
runtime.notetsleep_internal: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.notetsleep_internal: pc-relative relocation of external symbol is not supported
runtime.notetsleep_internal: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.findrunnable: pc-relative relocation of external symbol is not supported
runtime.findrunnable: unsupported obj reloc R_PCREL/4 to _cgo_yield
runtime.sysmon: pc-relative relocation of external symbol is not supported
runtime.sysmon: unsupported obj reloc R_PCREL/4 to _cgo_yield

CL 35494 introduced _cgo_yield which hit an unimplemented path in the darwin/arm linker. Darwin/arm64 is fine.

[eliasnaur]

@crawshaw do you know enough about the darwin/arm linker to suggest a fix?

[gopherbot]

CL https://golang.org/cl/38596 mentions this issue.