C51 v6.03+; uVision v2.07+ I want to build a Project with some files using the SMALL model, but most using LARGE. If I select LARGE in the Target options, and specify SMALL in the C51 'Misc Controls' where required, or use a #pragma in the file itself, I get a fatal Compiler error:
RESPECIFIED OR CONFLICTING CONTROL
L14: INCOMPATIBLE MEMORY MODEL
The problem is this: If you have a file (compiled in SMALL memory model) and another file (compiled in LARGE memory model) and both files call the printf library routine...which printf routine is included from the library? The LARGE model printf or the SMALL model printf? The answer is that this is an error condition. The memory model applies to the WHOLE program. It specifies not only the default variables space for YOUR functions but also the default variable space for the LIBRARY routines. When you create a program, you may specify the memory model on a function-by-function basis. For example:
int my_func (int a, int b, int c) large
So if I don't use any (Keil) Library functions, or if I'm careful to make sure they're all the same model, I should be OK? Is it possible to specify explicitly which Library the Linker should use? If I had:
#pragma LARGE : int my_func (int a, int b, int c) small
So if I don't use any (Keil) Library functions, or if I'm careful to make sure they're all the same model, I should be OK? Yep, but I haven't tested this. Is it possible to specify explicitly which Library the Linker should use? If I had: #pragma LARGE : int my_func (int a, int b, int c) small would that call 'large' model libraries? Yep. Jon
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