BackgroundIndex stores data in the wrong place when CDBs overlap

[sam-mccall]

Bugzilla Link	42669
Resolution	FIXED
Resolved on	Jul 22, 2019 11:17
Version	unspecified
OS	Linux
Blocks	#41819

Extended Description

e.g.

src/
compile_commands.json (symlink to build/compile_commands.json)
file1.cc (depends on file1.h, build/file2.h)
file1.h
build/
compile_commands.json (
file2.cc
file2.h

we expect src/.clangd/index/ to index file1., and src/build/.clangd/index/ to index file2.. However currently shards are stored next to the TU that created them, which isn't well-defined.

[sam-mccall]

assigned to @zmodem

[kadircet]

That should be fixed with:

reviews.llvm.org/rL366455
reviews.llvm.org/rL366559

Could you merge these to release branch @​hans?

[zmodem]

Merged both to the 9 branch in r366718.