> On Jan 9, 2018, at 6:51 AM, Michał Górny via Phabricator via lldb-commits
> <lldb-commits@lists.llvm.org> wrote:
>
> mgorny added a comment.
>
> In https://reviews.llvm.org/D41725#970926, @labath wrote:
>
>> In https://reviews.llvm.org/D41725#969388, @mgorny wrote:
>>
>>> I was talking of:
>>>
>>> source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
>>> source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
>>
>>
>> Ah, right. These uses were introduced before we developed a preference for
>> llvm primitives. That said, I see a lot of compression stuff there, but I
>> don't see mention of zlib directly.
>
>
> In the first of those files there are two `HAVE_LIBZ` conditionals that use
> zlib. There's also `HAVE_LIBCOMPRESSION` for the other library, I suppose
> it's relevant to Darwin.
>
> Therefore, I have three questions:
>
> 1. Should we add a separate check/switch for zlib here, or just use
> `LLVM_ENABLE_ZLIB`?
> 2. Should I post a patch rewriting this little zlib bit to reuse
> libLLVMSupport?
> 3. Should I look into merging libcompression support into libLLVMSupport?
For lldb main sources, it's fine to use llvm's zlib impl instead of libz. In
the debugserver project under tools/, we still link to libz because debugserver
does not have any dependencies on llvm.
I haven't looked at the llvm compression API so I don't know how easy it would
be to add libcompression support. libcompression is only available on macOS
10.11 ("El Capitan", released late 2015) and newer. The API is documented here:
https://developer.apple.com/documentation/compression/data_compression?language=objc
on Darwin systems, lldb will prefer the lzfse compression algorithm when both
sides are using libcompression. It will fall back to zlib-deflate as its next
choice.
J
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