[PATCH] D66555: [driver] add a new option `-gen-cdb-fragment-path` to emit a fragment of a compilation database for each compilation

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.
arphaman added reviewers: Bigcheese, jkorous, dexonsmith.
Herald added a project: clang.

This patch adds a new option called `-gen-cdb-fragment-path`  to the driver, which can be used to specify a directory path to which clang can emit a fragment of a CDB for each compilation it needs to invoke.

The CDB fragment is emitted into a unique file in the specified directory. It contains the `-cc1` clang invocation in its command. The file itself is actually a valid standalone CDB (if you disregard the not yet well supported `-cc1` innovation by the CDB, which I'll fix). To load the full CDB that can be emitted during a build, I'm going to add a new CDB reader from a directory that reads all fragments and aggregates them into one CDB in a follow-up patch.

This is useful to setup verification infrastructure for `clang-scan-deps` for some projects that don't have a way of constructing a CDB from their build.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D66555

Files:
  clang/include/clang/Driver/Driver.h
  clang/include/clang/Driver/Job.h
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/Compilation.cpp
  clang/lib/Driver/Driver.cpp
  clang/test/Driver/gen-cdb-fragment.c

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