[clangd-dev] clangd-indexer fails with concurrency and multiple directories

[Shane Hird via clangd-dev]

clangd-indexer does not seem to handle compile_commands.json with different
directories. I am able to workaround the problem by passing '
-execute-concurrency=1'.

It seems to work ok with a single directory (i.e with just 'abc' from the
example below), but fails if there are multiple, as in the example below.
I am working with revision 356635 of clangd.

With a directory structure of:

./
./abc
./abc/test.h
./abc/test.cc
./def
./def/ytest.h
./def/xtest.cc
./compile_commands.json

And a compile_commands.json of:

[
    {
        "arguments": [
            "g++",
            "-c",
            "-o",
            "test.o",
            "test.cc"
        ],
        "directory": "/home/test/abc",
        "file": "test.cc"
    },
    {
        "arguments": [
            "g++",
            "-c",
            "-o",
            "xtest.o",
            "xtest.cc"
        ],
        "directory": "/home/test/def",
        "file": "xtest.cc"
    }
]

I receive the error:

[test]$ clangd-indexer -executor=all-TUs compile_commands.json  > clangd.dex
[1/2] Processing file /home/test/abc/test.cc
[2/2] Processing file /home/test/def/xtest.cc
error: no such file or directory: 'test.cc'
error: no input files
error: unable to handle compilation, expected exactly one compiler job in ''
Error while processing /home/test/abc/test.cc.
Failed to run action on /home/test/abc/test.cc


I assume it may be related to a non-thread-safe chdir somewhere in the code.
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