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

[Matthias Kretz]

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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