[CMake] using ctest launchers leads to empty warning/error messages on the dashboard

[Matthias Kretz]

OK, this patch is bogus. Because 
cmCTestBuildHandler::LaunchHelper::LaunchHelper should call MakeDirectory 
already if this->Handler->UseCTestLaunch is true.

Makes my test results even more strange then.

On Friday 24 July 2015 11:28:13 Matthias Kretz wrote:
> On Friday 24 July 2015 10:23:48 Matthias Kretz wrote:
> >   set(ENV{CTEST_USE_LAUNCHERS_DEFAULT} "ON")
> > 
> > I don't get any output on the CDash dashboard anymore. AFAICT the Build
> > directory in Testing/tag/ is removed but never recreated.
> 
> With the following patch I get output back to the dashboard:
> --- a/Source/CTest/cmCTestLaunch.cxx
> +++ b/Source/CTest/cmCTestLaunch.cxx
> @@ -207,6 +207,7 @@ void cmCTestLaunch::ComputeFileNames()
>    this->LogDir = d;
>    cmSystemTools::ConvertToUnixSlashes(this->LogDir);
>    this->LogDir += "/";
> +  cmSystemTools::MakeDirectory(this->LogDir);
> 
>    // We hash the input command working dir and command line to obtain
>    // a repeatable and (probably) unique name for log files.
> 
> But the dashboard still shows the conflated output of the parallel build
> instead of the correct context per source/object file.
> 
> Cheers,
> 	Matthias
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