Multiply definition in a empty project

This really is a horrible abuse of the English language; ARM - a Cambridge company, no less - should be ashamed of it!

When they say "multiply defined" they mean that there are multiple definitions of the symbols

The error messages tell you where those multiple definitions are:

Giuseppe said:

irq_cm0.o and stm32f0xx_it.o

irq_cm0.o is the object file produced by compiling irq_cm0.c;

stm32f0xx_it.o is the object file produced by compiling stm32f0xx_it.c.

So you need to look at those two source files and decide which is the definition to keep, and which it the one to remove.

EDIT

Note that this is general C stuff - not specific to Keil or ARM.

This really is a horrible abuse of the English language; ARM - a Cambridge company, no less - should be ashamed of it!

When they say "multiply defined" they mean that there are multiple definitions of the symbols

The error messages tell you where those multiple definitions are:

Giuseppe said:

irq_cm0.o and stm32f0xx_it.o

irq_cm0.o is the object file produced by compiling irq_cm0.c;

stm32f0xx_it.o is the object file produced by compiling stm32f0xx_it.c.

So you need to look at those two source files and decide which is the definition to keep, and which it the one to remove.

EDIT

Note that this is general C stuff - not specific to Keil or ARM.

Thank you for the answer. Yes, I know that if I remove one definition of them the program should be linked well, but I don't understand if it is normal that an autogenerated code produces two definitions of the same function. These definitions wasn't made by myself, I didn't do anything, simply I selected the modules that was necessary for the program and I compiled the autogenerated code. Is the modification of the autogenerated code normal in this environment?

What "auto generator" are you using?

It clearly shouldn't happen - because the result cannot build.

either you've just chosen an incompatible set of options, or you've missed some configuration setting.