[lldb-dev] Is anyone using the gtest Xcode project?

[Zachary Turner]

I got confirmation from Vince offline that we don't need gtest in the Xcode
workspace in its current form (i.e. the scheme that runs the do-gtest.py).
So I'm going to check in my changes which add gtest to the CMake and delete
this xcodeproj from the repo.  This may result in errors in the Xcode
workspace the next time you load it up.  This should be as easy to fix as
removing the reference to gtest.xcodeproj.

I will try to figure out how to do that later today as well if nobody beats
me to it, but I have a few things I need to get to first.

On Thu, Mar 12, 2015 at 6:19 PM <jingham at apple.com> wrote:

> Right, you could either do this in the lldb.xcodeproj or in a separate
> project which you include in the lldb.xcworkspace.  There's no real reason
> to cram everything into the lldb.xcodeproj, as long as it is added to the
> workspace it is easy to access it, set up dependencies, etc.
>
> Jim
>
> > On Mar 12, 2015, at 6:14 PM, Zachary Turner <zturner at google.com> wrote:
> >
> > Ahh yea, i think it's fine the way you describe (explicitly adding each
> one to the right target), because that's how the Xcode project works for
> regular LLDB no? So we could have a Tests folder in Xcode, which contains
> Host, Plugins, and Utility folders, and those folders contain more files
> (or subfolders) and all of this gets compiled into a single executable
> named lldb-unit-tests.
> > On Thu, Mar 12, 2015 at 6:08 PM <jingham at apple.com> wrote:
> >
> > > On Mar 12, 2015, at 6:00 PM, Zachary Turner <zturner at google.com>
> wrote:
> > >
> > > Well, like I said.  I'm just thinking :)  No need to worry
> > >
> > > Back to the original question, is it as easy as it seems to just
> create one target in Xcode that manually includes each file recursively in
> the subtree?  So it just builds one executable?
> > >
> >
> > I don't think so. You can ADD a folder of sources to a project, but that
> just makes all the files available to the project.  You then have to
> manually tell Xcode which files build into which targets.  That's pretty
> easy to do, but I don't know of a way to  get it to "include all .c files
> in the current target."
> >
> > Jim
> >
> > (I removed Chandler & Justin 'cause I doubt they care about Xcode...)
> >
> >
> > > On Thu, Mar 12, 2015 at 5:56 PM <jingham at apple.com> wrote:
> > > The lldbinline  tests are an okay way to write a very simple class of
> tests.  But they will not suffice for many of the tests we need to write.
> I am actually not a big fan of these tests because when they fail it is a
> royal pain to reproduce the steps that led to the failure.  I don't think
> making a wholly different runner to run this is going to make that
> situation any better.
> > >
> > > Jim
> > >
> > >
> > > > On Mar 12, 2015, at 5:38 PM, Zachary Turner <zturner at google.com>
> wrote:
> > > >
> > > > Well, as a quick example of where I think there's a considerable
> amount of overlap between the high level model of how the test operates is
> the case of the lldbinline tests.
> > > >
> > > > On Thu, Mar 12, 2015 at 5:28 PM <jingham at apple.com> wrote:
> > > >
> > > > > On Mar 12, 2015, at 5:06 PM, Zachary Turner <zturner at google.com>
> wrote:
> > > > >
> > > > > Wasn't really trying to get into an extended discussion about
> this, but FWIW I definitely realize that lldb's tests are more complicated
> than what lit currently supports.  But that's why I said "even if it meant
> extending lit".  It was mostly just a general comment about how it's nice
> if everyone is focused on making one thing better instead of everyone
> having different things.
> > > > >
> > > >
> > > > Depending on how different the different things are.  Compiler tests
> tend to have input, output and some machine that converts the input to the
> output.  That is one very particular model of testing.  Debugger tests need
> to do: get to stage 1, if that succeeded, get to stage 2, if that
> succeeded, etc.  Plus there's generally substantial setup code to get
> somewhere interesting, so while you are there you generally try to test a
> bunch of similar things.  Plus, the tests often have points where there are
> several success cases, but each one requires a different "next action",
> stepping being the prime example of this.  These are very different models
> and I don't see that trying to smush the two together would be a fruitful
> exercise.
> > > >
> > > > Jim
> > > >
> > > > > As for specifics, my understanding is that lit parallelizes better
> (so running tests is faster), understands how to build programs (so doesn't
> require makefiles), and has a richer language for specifying how and under
> what circumstances different tests should be run.  It's also familiar to
> other LLVM developers (so encourages cross-collaboration), and allows one
> to write self-contained tests with the program to test and the check in a
> single file (less maintenance).
> > > > >
> > > > > In any case, I'm really not an expert on lit, so +bogner and
> +chandlerc in case they want to chime in.  I do think it's at least worth
> thinking about whether lit *could* be extended to meet LLDB's needs -- if
> nothing else as a thought exercise, and maybe learning more about how it
> works would give us some ideas to make our own test suite better.
> > > > >
> > > > >
> > > > > On Thu, Mar 12, 2015 at 4:39 PM <jingham at apple.com> wrote:
> > > > >
> > > > > > On Mar 12, 2015, at 4:08 PM, Zachary Turner <zturner at google.com>
> wrote:
> > > > > >
> > > > > > Oh I'm all for reusing as much of the existing mechanism as
> possible.  Was just stating how the CMake worked as a discussion point.
> Another possibility would be to just have the Xcode project build one
> executable that pulls in sources recursively from the entire subtree.  Is
> this as easy in Xcode as just adding all sources from a subfolder to a
> single target?
> > > > >
> > > > > >
> > > > > > One day far off in the future it would be nice if all of LLDB's
> tests were ported to lit (even if that meant extending lit to make it do
> what we needed it to do),
> > > > >
> > > > > Why would this be nice?  It looks like lit is a good test runner
> for tests that have some input, do something with the input, produce an
> output and check that output is matches some pattern.  That is not at all
> what the lldb tests look like.  They often have to do complex dances - for
> instance depending on how the line tables come out there are many "correct"
> ways to step through code.  If you are going to test this you've got to do
> "step, if I got to a close bracket, step again, if I got past it don't.
> Etc...
> > > > >
> > > > > I see no benefit in extending a simple runner like lit to do the
> complex dances the lldb testsuite sometimes has to do.  I'm all for
> sharing, but it is also okay to have two implementations of some
> functionality if the two uses are sufficiently different, and this
> certainly seems like one of those cases.
> > > > >
> > > > > > so I can definitely see some value in hooking lit up to the
> Xcode build so it does everything the CMake build does.  I'll have to look
> into exactly what steps the CMake and/or autoconf build are taking, but I
> suspect it's going to involve running CMake from a script, so not very
> desirable.  I'm still learning a lot of this stuff though, so there may be
> a better way.  Either way, I'll have to look into it a little bit.
> > > > >
> > > > >
> > > > > Jim
> > > > >
> > > > >
> > > > > >
> > > > > > In the meantime, if running unit tests from Xcode is not part of
> anyone's usual workflow, can I remove it for now?
> > > > > >
> > > > > > On Thu, Mar 12, 2015 at 4:01 PM <jingham at apple.com> wrote:
> > > > > > I'm not sure if this is what you meant, but I don't see a lot of
> value in making an Xcode project that has targets for each of the gtest
> binaries, and then tries to run the tests.  Seems to me it would be better
> if the gtest project just invokes whatever mechanism the cmake build would
> do to run the tests.  That's just another set of things to keep in sync.
> > > > > >
> > > > > > It is sufficient to have a target that just does whatever steps
> cmake/lit do to build the gtests & run them, if that is possible.  I guess
> if you can't do this without running cmake in the lldb top-level directory
> that would be a problem.  But it still seems better to me to wire that up,
> than to have to add tests to both Xcode & cmake.
> > > > > >
> > > > > > Jim
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > > On Mar 12, 2015, at 3:46 PM, Zachary Turner <
> zturner at google.com> wrote:
> > > > > > >
> > > > > > > So I'm guessing the scheme runs do-gtest.py.  I'd like to
> delete that file as well as all the Makefiles in the directory if
> possible.  It seems like these files should be built using the normal Xcode
> build system the same way the rest of LLDB is built.
> > > > > > >
> > > > > > > The way the CMake does it is that each test folder generates a
> new executable.  So right now it will build HostTests.exe,
> ProcessLinuxTests.exe, and UtilityTests.exe.  And then CMake will invoke
> lit (the LLVM test runner) to run each of the executables one by one and
> print the output.
> > > > > > >
> > > > > > > I'm not sure if that's easy or feasible to do in the Xcode
> build.  I kind of don't want to leave this do-gtest.py and Makefiles in the
> build though, because the more of this stuff we have the more maintenance
> it is, and things tend to rot.
> > > > > > >
> > > > > > >
> > > > > > > On Thu, Mar 12, 2015 at 3:23 PM <jingham at apple.com> wrote:
> > > > > > > Xcode has "projects" and then "workspaces" and "schemes".
> Workspaces aggregate projects.  Schemes exist in both workspaces and
> projects and are the way to say "do something with some of the stuff
> referred to by this project/workspace."  So the way to do this formally is
> to have the gtest scheme build & run the tests from the gtest project.
> > > > > > >
> > > > > > > The lldb.xcworkspace file does reference the gtest xcode
> project, and it has a scheme for the gtest.
> > > > > > >
> > > > > > > Not sure what the scheme does yet, I'll look in a few minutes
> if nobody beats me to it, I'm in the middle of things right now.
> > > > > > >
> > > > > > > Jim
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > > On Mar 12, 2015, at 2:41 PM, Zachary Turner <
> zturner at google.com> wrote:
> > > > > > > >
> > > > > > > > In lldb/gtest there is a gtest.xcodeproj folder with what I
> guess is an Xcode project.  If I understand the way Xcode works, the way to
> use this is by opening this in another instance of Xcode separate from your
> normal LLDB project, and then building it.  Is this right?
> > > > > > > >
> > > > > > > > I have a patch that moves some files around, and if nobody
> is using this Xcode project, I would like to delete it.  Then, after I get
> the tests up and running in the CMake build, we can add it to the "real"
> Xcode project as a separate target similar to how you currently run the
> LLDB Test suite.
> > > > > > > >
> > > > > > > > Any objections to deleting the Xcode project?
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
>
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