[llvm-dev] How to make a subdirectory in a lit test?

[David Blaikie via llvm-dev]

Looks like 989c9e75a6fd1ef6eed9777fcd95b0f40b93f40c added a
lit-internal version of mkdir. Not sure if/how that is/isn't exposed
to lldb's test suites.

On Thu, Aug 6, 2020 at 4:21 PM Adrian McCarthy <amccarth at google.com> wrote:
>
> Yeah, the llvm-ar tests are working on Windows.  But I'm getting different results when I try to use the same commands in an LLDB lit test.  Maybe there's something messed up in LLDB's local lit config?
>
> If I have `mkdir %t/subdir` in my lit test, I get either file-not-found or a complaint about "unrecognized option /subdir."
>
> The one-and-only mkdir on my PATH is "C:\Program Files\Git\usr\bin\mkdir.exe".  If I run that explicitly, bypassing the one build into the Windows CMD prompt, I can use `--help`, `--parents`, and `--version` (among others).  But if I issue those commands from the lit test, I get reports of "unsupported option: `--parents`" and subdirectories named `--help` and `--version`.  That tells me lit isn't running the same command, though the "unsupported option" is not an error message I'd expect from CMD's mkdir.
>
> The GnuWin tools have been removed from my machine for a while now.  `which` and `where` report only the Git version.
>
> 'Tis a puzzle.
>
> On Thu, Aug 6, 2020 at 3:45 PM David Blaikie <dblaikie at gmail.com> wrote:
>>
>> there are some existing tests that seem to do this, for instance:
>>
>> llvm/test/tools/llvm-ar/lto-kind-from-triple.test
>>
>> Are these not running on Windows?
>>
>> On Thu, Aug 6, 2020 at 3:36 PM Adrian McCarthy via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> >
>> > I'm writing a lit test that needs to temporarily make a subdirectory.
>> >
>> > I tried:
>> >
>> > ```
>> > // RUN: mkdir %t/subdir
>> > ```
>> >
>> > But on Windows, it's hard to bypass the built-in mkdir to use a Posix-style one from Git or GnuWin.  The built-in mkdir believes the `/subdir` is an unrecognized command flag.  I figure I cannot just use a backslash because that would fail on Posix systems.  (The test should run on all platforms.)
>> >
>> > The lit documentation mentioned a `%{pathsep}` macro, so I tried that.  After several minutes of confusing results, I discovered this is not for the path component separator, but for the separators used between paths in the PATH environment variable.  On Windows, that's ';', which doesn't help.
>> >
>> > Suggestions?
>> >
>> > Thanks,
>> > Adrian McCarthy
>> >
>> > Why does this test need a separate directory?
>> >
>> > The test is to confirm that LLDB can locate a PDB symbol file that corresponds to the target executable.  In the executable, the linker writes the location where it generated the PDB file.  I need that path to be a different directory than the directory for the executable itself because the fallback search includes the directory of the executable.
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