uVision1 & uVision2 (keil) c51 differences

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Hi, I have inhereted an old project from the late 90's that was built
using keils uVision1 compiler (c51) for Dallas 87C520. I have created a
new project to compile and link the code in uVision2.

I get a lot of these messages


which according to the c51 primer book seems to be caused by jump
tables of functions, which are in the code.

Wondering what to do. I think the project compiled and linked ok with
uVision1 (don't have the application anymore). So is there really that
big a difference between the compilers?

What can I do to cure these warnings? It almost seems like a backwards
step if the compiler can't deal with this anymore.

Eventually I get an error since I have too many warnings.

Any thoughts?

Re: uVision1 & uVision2 (keil) c51 differences

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Function pointers in C51 are indeed something that has to be used with
great care.  Unless your project is so small that you can afford
turning off overlay analysis in the linker, it wreaks havoc with
fundamental aspects of how C51 works, and needs special manual
attention to be usable.

You'll have to recreate some detailed settings in the IDE --- if you
didn't import your uV1 project into uV2, but tried created a new one
instead, it's time to rethink that decision.  Also see the Keil
website for appnotes that explain this in more details.

Hans-Bernhard Broeker ( snipped-for-privacy@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.

Re: uVision1 & uVision2 (keil) c51 differences
Is your code making callto to other segments from interrupts?

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Re: uVision1 & uVision2 (keil) c51 differences

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Is there a compiler option to automatically make all functions re-entrant?  
In the compiler I use (Hi-tech C51) this can be done by specifying the  
large memory model.

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