Also you will have to take care of the bug SDSsq29328 after upgrading to CCS 2.21.

Release Note

DSP/BIOS generated *cfg_c.c cannot be used with C++ examples due to badly performed pragma. 
This is because the #pragma statements in the *cfg_c.c cause incorrect compilation when 
interpreting the file as a C++ file.

 Workaround Note


 Workaround for this would be to replace the line 

 #pragma CODE_SECTION(CSL_cfgInit,".text:CSL_cfgInit") 

 in *cfg_c.c with the following lines and perform an incremental build.
  
 #ifdef __cplusplus 
 #pragma CODE_SECTION(".text:CSL_cfgInit") 
 #else 
 #pragma CODE_SECTION(CSL_cfgInit,".text:CSL_cfgInit") 
 #endif