STMicroelectronics STM32 - Keil MDK-Arm vision; Figure 19. Keil vision Code Optimization Option

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AN4989 Compiling for debug
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3.1.2 Keil
®
MDK-Arm µVision
In Project Option for Target->C/C++->Optimization
Figure 19. Keil
®
µVision Code Optimization option
Keil
®
documentation suggests that Level1 (-O1) can be a suitable alternative for debug.
Refer to www.keil.com support page Compiler optimization levels and the debug view for
details.