[llvm-bugs] [Bug 41195] New: clangd-indexer fails using concurrency with multiple directories

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41195

            Bug ID: 41195
           Summary: clangd-indexer fails using concurrency with multiple
                    directories
           Product: clang-tools-extra
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: clangd
          Assignee: unassignedclangbugs at nondot.org
          Reporter: shanehird at gmail.com
                CC: llvm-bugs at lists.llvm.org

I reported this to the mailing list but it may be more appropriate here.

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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