ccls

ccls, which originates from cquery, is a C/C++/Objective-C language server.

• code completion (with both signature help and snippets)
• definition/references, and other cross references
• call (caller/callee) hierarchy, inheritance (base/derived) hierarchy, member hierarchy
• symbol rename
• document symbols and approximate search of workspace symbol
• hover information
• diagnostics
• code actions (clang FixIts)
• preprocessor skipped regions
• semantic highlighting, including support for rainbow semantic highlighting

It makes use of C++17 features, has less third-party dependencies and slimmed-down code base. Cross reference features are strengthened, (see wiki/FAQ). It currently uses libclang to index C++ code but will switch to Clang C++ API. Refactoring and formatting are non-goals as they can be provided by clang-format, clang-include-fixer and other Clang based tools.

The comparison with cquery as noted on 2018-07-15:

	cquery	ccls
third_party	more	fewer
C++	C++14	C++17
clang API	libclang (C)	clang/llvm C++
Filesystem	AbsolutePath + custom routines	llvm/Support
index	libclang	clangIndex, some enhancement
pipeline	index merge+id remapping	simpler and more robust

cquery has system include path detection (through running the compiler driver) while ccls uses clangDriver.

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