__C51__ undefined in uV4?

I wrote and debugged a project on a workstation running uV3 (V3.30a) a while back. It contains a file that must be shared with other (von Neumann) processors that do not use Keil development tools...
__C51__ undefined in uV4?

I wrote and debugged a project on a workstation running uV3 (V3.30a) a while back. It contains a file that must be shared with other (von Neumann) processors that do not use Keil development tools...
#ifndef does not work properly

Hello! I want to include the same headerfile in more than one sourcefile and of course have to take care that each Headerfile is included just once. I really have no clue, why this works for...
#ifndef does not work properly

Hello! I want to include the same headerfile in more than one sourcefile and of course have to take care that each Headerfile is included just once. I really have no clue, why this works for...
Does the #ifndef to prevent recursive inclusion actually work ?

I am experimenting with the Keil MDK-ARM toolchain (the free version), and an STM32F407 Discovery board. So far so good, were it not for a small problem. My background is with Embarcadero RAD Studio...