[CMake] [CTest] Set BuildName through command line

[Kim Kryger]

I'm trying to simply set the name of the build to be sent to CDash to
something on the command line. I've tried a few different avenues, but no
options seem to affect the build name, other than reconfiguring CMake. I am
using Visual Studio, which of course is multi-configuration, which means
that a single CTest file is used when building, but when I build Debug and
Release tests, the CDash output treats them as the same build, and it
considers the results to be similar, when I want them to be separated by
build name. Can I use generator expressions somehow?

I shouldn't have to reconfigure cmake to change a simple name for the CTest
build name.

Here are some of my attempts:
"C:\Program Files (x86)\CMake 3.3\bin\ctest.exe" -D
BuildName:String=MyBuild -C Debug -D ExperimentalBuild

"C:\Program Files (x86)\CMake 3.3\bin\ctest.exe" -D
CTEST_BUILD_NAME:String=MyBuild -C Debug -D Experimental

"C:\Program Files (x86)\CMake 3.3\bin\ctest.exe" --overwrite
BUILDNAME=MyBuild -C Debug -D Experimental

"C:\Program Files (x86)\CMake 3.3\bin\ctest.exe" --overwrite
CTEST_BUILD_NAME=MyBuild -C Debug -D Experimental

I was hoping -S was a supplement to the already created configuration file,
but nope, it's meant to be a complete replacement for the default.

I found this thread but it's not the solution I was hoping to use.
http://public.kitware.com/pipermail/cmake/2010-June/037706.html

Is there a command line option I'm missing or using incorrectly, or is this
seriously not something that is supported?

Thanks,
Kim
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