Hast Du es mal mit _kibitz versucht?
Code:
msbuild %1.dproj /p:config=Debug /target:_kibitz /p:_kibitztask="EvaluateProperty" /p:_EvaluateName="DCC_Define" /NoLogo /verbosity:normal >msbuild.log
findstr /C:"EvaluateProperty=" msbuild.log > msbuild.found
for /F "tokens=2* Delims==" %%a in (msbuild.found) do echo %%a