[lldb-dev] LLDB test executable architectures
Matthew Gardiner
mg11 at csr.com
Wed Jul 30 23:32:07 PDT 2014
Zachary Turner wrote:
> So just to be clear, assuming I made this change, I'm not saying that
> dotest would require you to pass in --arch, I'm just saying it would
> pick a more straightforward default. In particular, the default of
> your host system. You can see the original logic for choosing the
> default in the OP, but it was something along the lines of:
>
> x64 Mac -> x86 + x64 tests
> x86 Mac -> x86 tests
> x64 Linux Clang -> x86 + x64 tests
> x64 Linux Non-Clang (GCC?) x64 tests
> x86 Linux Clang -> x86 tests
> x86 Linux Non-Clang -> x86 tests
>
> So you'd have the following net changes:
>
> x64 Mac -> Don't run x86 tests anymore
> x64 Linux Clang -> Don't run x86 tests anymore
>
> Nothing else would change. And again, these would just be for the
> cases where you ran dotest.py without a --arch arg. You could still
> override it.
Ok, fair enough - thanks for putting my mind at rest. Clearly the
process should not be more difficult than it already is.
>
> If it's truly useful then I don't mind leaving it, but I'd at least
> like to understand why it's so asymmetric. Like what's the issue with
> Linux GCC x64? Why can't it run x86 tests?
I see what you mean. I'm not sure why CLANG builds test both
architectures. Perhaps the CLANG environment has features which make it
easier to run 32 stuff on 64 OSes? (I know very little about
clang/llvm). I'm making this claim because I know that on my Fedora 20
64-bit box, with stuff built on GCC, I had to install additional (i.e.
32 bit support libraries) to get C and C++ binaries to run under the
64-bit linux. So perhaps there is a reason?
>
>
> On Wed, Jul 30, 2014 at 10:09 PM, Matthew Gardiner <mg11 at csr.com
> <mailto:mg11 at csr.com>> wrote:
>
> Just recently I figured out how to successfully run dotest.py on a
> 64-bit linux. I ran it from the command line as follows:
>
> $ my-lldb-source-directory/test >
> LD_LIBRARY_PATH=/my-build-directory/lib/
> PYTHONPATH=/my-build-directory/lib/python2.7/site-packages/
> python dotest.py --executable=/my-build-directorybin/lldb -v
> --compiler=gcc -q .
>
> The above incarnation took some time to figure out!
>
> I guess what I'm saying is if dotest.py is changed in such a way
> that it needs to be run using another tool, and/or if the -arch
> setting must be passed in, then this should be documented *within*
> dotest.py itself.
>
>
> Zachary Turner wrote:
>
> Well I guess it would be helpful to know how you run the
> tests. Do you run dotest.py from the command line? Or do you
> have a tool that drives the script? Because if it's the
> latter, then the tool can just pass in whatever architectures
> it wants. I have a patch to the CMake build right now that
> makes the CMake build always pass in the target architectures.
> So that will remove the need for this logic for anyone
> running tests via CMake. But I'm not sure what you do on Mac.
>
> I guess what I'm saying is that complicated logic is fine if
> it's useful. I just don't know if it's useful (maybe it is,
> but I don't know what the workflow is like on Mac). If you
> guys are already running all the tests via a tool that passes
> in --arch on the command line, or if you're willing to change
> whatever tool you do use (the Xcode project?) to pass in
> --arch, then the logic here probably isn't that useful.
>
>
> On Wed, Jul 30, 2014 at 6:58 PM, Greg Clayton
> <gclayton at apple.com <mailto:gclayton at apple.com>
> <mailto:gclayton at apple.com <mailto:gclayton at apple.com>>> wrote:
>
> If the logic is broken, please fix, but don't remove or
> simplify
> it just because it is complex. Make sure that if a
> platform (like
> darwin) supports both x86_64 and i386 binaries, that the
> tests run
> for both so we cover all bases and know if something fails
> for 32
> or 64 bit. Sounds like on Windows you only want to run
> x86_64 for
> 64 bit machines or i386 for 32 bit machine right?
>
> Just make sure Darwin runs both with what ever fix you make.
>
> > On Jul 29, 2014, at 4:22 PM, Zachary Turner
> <zturner at google.com <mailto:zturner at google.com>
> <mailto:zturner at google.com <mailto:zturner at google.com>>>
> wrote:
> >
> > Currently dotest.py contains the following logic to
> determine
> what architectures to compile the test executables as:
> >
> > if args.archs:
> > # architectures were specified on the command
> line, just
> use them
> > else:
> > if (platform_system == 'Darwin' or
> (platform_system ==
> 'Linux' and compilers == ['clang'])) and platform_machine
> == 'x86_64':
> > archs = ['x86_64', 'i386']
> > else:
> > archs = [platform_machine]
> >
> > Does anyone actually need this kind of complicated
> logic? It's
> kind of magical and hand-wavy. There's no indication of
> why it
> makes sense that Darwin+x64 system would default to
> running both
> x64 and x86 tests, or why linux gcc x64 would run only x64
> tests
> but not x86 tests, even though linux clang x64 would run
> both sets
> of tests.
> >
> > I'd like to simplify it if possible (partly because this
> logic
> is actually broken on Windows, so I need to revisit it
> anyway).
> Is there any reason we can't just keep it as simple as
> "If it's
> on the command line, use it, otherwise default to running
> only the
> tests corresponding to the system platform?"
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