[PATCH] D39799: [Tooling] Use FixedCompilationDatabase when `compile_flags.txt` is found.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
Herald added a subscriber: ilya-biryukov.

This is an alternative to JSONCompilationDatabase for simple projects that
don't use a build system such as CMake.
(You can also drop one in ~, to make your tools use e.g. C++11 by default)

There's no facility for varying flags per-source-file or per-machine.
Possibly this could be accommodated backwards-compatibly using cpp, but even if
not the simplicity seems worthwhile for the cases that are addressed.

Tested with clangd, works great! (requires clangd restart)


https://reviews.llvm.org/D39799

Files:
  docs/JSONCompilationDatabase.rst
  include/clang/Tooling/CompilationDatabase.h
  lib/Tooling/CompilationDatabase.cpp
  test/Tooling/fixed-database.cpp

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