I have downgraded CCS6 to CCS5 by installing CCS5 after CCS6 and needed libraries/tools
In fact its a parallel install where both CCS versions have their own "native" Eclipse.
CCS6 to CCS5 both have their own workspaces.
When compiling a small TM4C129ENCZAD example i get the following error message in CCS5.
xdc.tools.configuro: Error: Can't find the platform package 'ti.platforms.stellaris'. TI platforms are no longer shipped as part of XDCtools (C:\ti\xdctools_3_30_04_52_core). Please ensure you are either using a pre-3.30 version of XDCtools or you have added a product that includes your platform support along the path 'C:/ti/bios_6_35_04_50/packages;C:/ti/ccsv5/ccs_base;C:\ti\xdctools_3_30_04_52_core/packages'. Check that this path names a directory containing the necessary platform support and that the platform name is properly spelled.
CCS5 and CCS6 seem to be using different versions of xdctools and internally have different compilers etc.
xdctools_3_30_04_52_core
xdctools_3_31_00_24_core
CCS5 reports an error if i attempt to install the newer xdctools.
Other than that there should be no difference external to ccs5 and ccs6 folders.
What's wrong? In CCS6 everything compiles and links fine.