SW4STM32 doesn't move to main loop
Another way you can force the inclusion of the infinite while() loop (with optimization on) would be to declare the i variable volatile, like this:
volatile uint32_t i;
while (1)
{
i++;
}
Doing this is also useful when you want to create a software delay and don’t care about accuracy, like this:
volatile uint32_t i;
for (i = 100000; i > 0; i--) ;
As for use of compiler optimization, I normally set the optimization level to “optimize for debug (-Og)” for the debug build of my projects, and use higher level optimization, normally “optimize for size (-Os)” for the release build.
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