please, "--bitband" error when line 114 and line 128 in "cmsis\core_cmInstr.h" were not commented. And it will faster when rebuild if both line 114 and line 128 were commented.
What version of MDK are you using?
What version of the cmsis\core_cmInstr.h file are you using?
How can we replicate this problem? I was not able to replicate the problem in a standard example using the --bitband directive.
See my post which I just did before ... "--bitband compiler switch fails (very strange!!!)".