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To avoid `llvm::report_fatal_error("unknown module format")` in getPCHContainerWriter.
See llvm/llvm-project@a3e2ff1

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

It has a global view of the code base and support a lot of cross reference features, see wiki/FAQ. It starts indexing the whole project (including subprojects if exist) parallelly when you open the first file, while the main thread can serve requests before the indexing is complete. Saving files will incrementally update the index.

>>> Getting started (CLICK HERE) <<<

ccls can index itself (~180MiB RSS when idle, noted on 2018-09-01), FreeBSD, glibc, Linux, LLVM (~1800MiB RSS), musl (~60MiB RSS), ... with decent memory footprint. See wiki/Project-Setup for examples.