cmd/link: emit a mach-o dwarf segment that dsymutil will accept
Right now, at least with Xcode 8.3, we invoke dsymutil and dutifully copy what it produces back into the binary, but it has actually dropped all the DWARF information that we wanted, because it didn't like the look of go.o. Make it like the look of go.o. DWARF is tested in other ways, but typically indirectly and not for cgo programs. Add a direct test, and one that exercises cgo. This detects missing dwarf information in cgo-using binaries on macOS, at least with Xcode 8.3, and possibly earlier versions as well. Fixes #19772. Change-Id: I0082e52c0bc8fc4e289770ec3dc02f39fd61e743 Reviewed-on: https://go-review.googlesource.com/38855 Run-TryBot: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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src/cmd/link/dwarf_test.go
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