[lldb] Include guards missing for compression.h

[ggreif]

See:

llvm-project/lldb/tools/debugserver/source/RNBRemote.cpp

Lines 43 to 45 in f15b60b

	#include <compression.h>

How it should be:

llvm-project/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp

Lines 49 to 51 in f15b60b

	#if defined(HAVE_LIBCOMPRESSION)
	#include <compression.h>
	#endif

This was detected while updating the nixpkgs for llvm-10.

Similarly

llvm-project/lldb/tools/debugserver/source/RNBRemote.cpp

Lines 715 to 761 in f15b60b

	case compression_types::zlib_deflate:
	scratchbuf_size = compression_encode_scratch_buffer_size (COMPRESSION_ZLIB);
	break;
	case compression_types::lzma:
	scratchbuf_size = compression_encode_scratch_buffer_size (COMPRESSION_LZMA);
	break;
	case compression_types::lzfse:
	scratchbuf_size = compression_encode_scratch_buffer_size (COMPRESSION_LZFSE);
	break;
	default:
	break;
	}
	if (scratchbuf_size > 0) {
	g_libcompress_scratchbuf = (void*) malloc (scratchbuf_size);
	g_libcompress_scratchbuf_type = compression_type;
	}
	}
	if (compression_type == compression_types::lz4) {
	compressed_size = compression_encode_buffer(
	encoded_data.data(), encoded_data_buf_size,
	(const uint8_t *)orig.c_str(), orig.size(),
	g_libcompress_scratchbuf,
	COMPRESSION_LZ4_RAW);
	}
	if (compression_type == compression_types::zlib_deflate) {
	compressed_size = compression_encode_buffer(
	encoded_data.data(), encoded_data_buf_size,
	(const uint8_t *)orig.c_str(), orig.size(),
	g_libcompress_scratchbuf,
	COMPRESSION_ZLIB);
	}
	if (compression_type == compression_types::lzma) {
	compressed_size = compression_encode_buffer(
	encoded_data.data(), encoded_data_buf_size,
	(const uint8_t *)orig.c_str(), orig.size(),
	g_libcompress_scratchbuf,
	COMPRESSION_LZMA);
	}
	if (compression_type == compression_types::lzfse) {
	compressed_size = compression_encode_buffer(
	encoded_data.data(), encoded_data_buf_size,
	(const uint8_t *)orig.c_str(), orig.size(),
	g_libcompress_scratchbuf,
	COMPRESSION_LZFSE);
	}

needs to be adapted.

[ggreif]

This is now https://bugs.llvm.org/show_bug.cgi?id=44690.

[llvmbot]

@llvm/issue-subscribers-lldb

[JDevlieghere]

https://reviews.llvm.org/D123616

[JDevlieghere]

@ggreif debugserver is only meant to be built on Darwin, where libcompression is always available. I think the right thing to do here is to stop building debugserver on NixOS.