Use parsed files to improve header compile commands (original) (raw)

Currently the dominant way we get compile commands for open headers is filename based matching (in JSONCompilationDatabase).

However we have two sets of better information:

• the files that have been open (headers are often opened after some file that includes them)
• the background index (most headers have been indexed by some TU)
  we could make use of these to get the TU, and then transfer its compile command.