The GCC MSP430 beta compiler v5.2.1 was downloaded from http://software-dl.ti.com/msp430/msp430_public_sw/mcu/msp430/MSPGCC/4_00_00_900/index_FDS.html and the 6.1.2.00014 Windows -> Preferences -> Code Composer Studio -> Build -> Compilers was used to add the path for discovered tools.
The Discovered Tools window shows that GNU v5.2.1 has been discovered by CCS. However, there is a red cross next to "GNU v5.2.1 (Red Hat)" in the Discovered Tools with pop-up text which says "Support for this tool is not available. Please update your workbench with the latest tool definitions":
Image may be NSFW.
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As a result, it is not possible to select use of the GNU v5.2.1 compiler in CCS projects.
Is there a CCS configuration file which can be modified to add support for the GNU v5.2.1 compiler, pending formal CCS support for the newer compiler?