[Patch] lit.cfg: better check for MSYS

[Reid Kleckner]

One other thing to look at here is execute_external, which controls whether
or not we're actually using bash from Cygwin.


On Mon, Jul 29, 2013 at 10:44 AM, Hans Wennborg <hans at chromium.org> wrote:

> I use the system's Python, maybe that's why we get different results:
>
> $ /cygdrive/c/python_26_amd64/files/python bin/llvm-lit -v
> ../tools/clang/test/Driver/cl.c
> -- Testing: 1 tests, 1 threads --
> UNSUPPORTED: Clang :: Driver/cl.c (1 of 1)
> Testing Time: 0.00s
>   Unsupported Tests  : 1
> llvm-lit: lit.cfg:184: note: using clang:
> 'D:/src/llvm/build.debug/bin/./clang.EXE'
>
> In my case, lit.getBashPath() returns "C:\src\cygwin\bin\bash.EXE".
>
> Do you think my patch is OK?
>
>
> On Mon, Jul 29, 2013 at 10:34 AM, NAKAMURA Takumi <geek4civic at gmail.com>
> wrote:
> > Hans, I am certain it would be less useful on cygwin.
> >
> > Python 2.6.8 (unknown, Jun  9 2012, 11:30:32)
> >>>> import platform
> >>>> platform.system()
> > 'CYGWIN_NT-6.1-WOW64'
> >
> > I can see "shell-preserves-root" is enabled on cygwin.
> >
> > PASS: Clang :: Driver/cl.c (2638 of 6275)
> >
> > Which version of python are you using on cygwin?
> >
> >
> > 2013/7/30 Hans Wennborg <hans at chromium.org>:
> >> Hi,
> >>
> >> The attached patch tightens the "shell-preserves-root" feature check
> >> in lit.cfg. Previously, the check would exclude this feature also on
> >> Cygwin, but as the comment suggests, I think it should only check for
> >> MSYS.
> >>
> >> With this patch, the number of unsupported tests on Cygwin go from 35
> to 32.
> >>
> >> I was not able to test this on MSYS. Takumi, could you give it a try?
> >>
> >> Thanks,
> >> Hans
>
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