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STM32F205 __disable_irq() undefined symbol Keil ARM

Question asked by RGB on Nov 20, 2013
Latest reply on Nov 21, 2013 by John F.
I want to disable all interrupts in my STM32F205  and I use macro __disable_irq() in core_cmFunc.h.
I verified that this instructions works fine, but in ARM Keil IDE, if I select "Go to definition of __disable_irq() " IDe returns me error: "undefined Definition/Reference", even if I include core_cmFunc.h.

Why this behaviour?