cmd/link: support DWARF compression on Darwin We want to compress DWARF even on macOS, but the native toolchain isn't going to understand it. Add a flag that can be used to disable compression, then add Darwin to the whitelist used during internal linking. Unlike GNU ld, the Darwin linker doesn't have a handy linker flag to do compression. But since we're already doing surgery to put the DWARF in the output executable in the first place, compressing it at the same time isn't unduly difficult. This does have the slightly odd effect of compressing some Apple proprietary debug sections, which absolutely nothing will understand. Leaving them uncompressed didn't make much sense, though, since I doubt they're useful without (say) __debug_info. Updates #11799 Change-Id: Ie00b0215c630a798c59d009a641e2d13f0e7ea01 Reviewed-on: https://go-review.googlesource.com/120155 Run-TryBot: Heschi Kreinick <heschi@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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