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cquery is no longer under development.clangd andccls are both good replacements.

cquery is a highly-scalable, low-latency language server for C/C++/Objective-C. It is testedand designed for large code bases likeChromium. cquery providesaccurate and fast semantic analysis without interrupting workflow.

cquery implements almost the entire language server protocol and providessome extra features to boot:

• code completion (with both signature help and snippets)
• findingdefinition/references
• call (caller/callee) hierarchy,inheritance (base/derived) hierarchy
• symbol rename
• document symbols and approximate search ofworkspace symbol
• hover information
• diagnostics
• code actions (clang FixIts)
• preprocessor skipped regions
• #include auto-complete, undefined type include insertion, include quick-jump(goto definition, document links)
• auto-implement functions without a definition
• semantic highlighting, including support forrainbow semantic highlighting

cquery is able to respond to queries quickly because it caches a huge amount ofinformation. When a request comes in, cquery just looks it up in the cachewithout running many computations. As a result, there's a large memory overhead.For example, a full index of Chrome will take about 10gb of memory. If youexclude v8, webkit, and third_party, it goes down to about 6.5gb.

MIT