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ArmClang: error: unsupported option '--C99'

pm68

Hi, 

I'm using Keil MDK V5.27.1.0 and the ARM Compiler V6 where I exported code from STMCubeMx V6.6.1

I'm getting the following error when I try to build the project in Keil:-

ArmClang: error: unsupported option '--C99'

I'm really stuck and cannot compiler my code. Can somebody please explain how I can get rid of this error?

Thanks,

Paul