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cmd/link: macos: set initial protection of 0 for __DWARF segment
For later versions of MacOS, the dynamic loader is more picky about enforcing restrictions on __DWARF MachO load commands/segments, triggering aborts of the form dyld: malformed mach-o image: segment __DWARF has vmsize < filesize for Go programs that use cgo on Darwin. The error is being triggered because the Go linker is setting "vmsize" in the DWARF segment entry to zero as a way to signal that the DWARF doesn't need to be mapped into memory at runtime (which we need to continue to do). This patch changes the initial protection on the __DWARF segment to zero, which dyld seems to be happy with (this is used for other similar non-loadable sections such as __LLVM). Fixes #32673 Change-Id: I9a73449c6d26c172f3d70361719943af381f37e6 Reviewed-on: https://go-review.googlesource.com/c/go/+/182958 Run-TryBot: Than McIntosh <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com> Reviewed-by: Cherry Zhang <firstname.lastname@example.org>
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