... since Clang doesn't infer the function type on '#pragma weak x = y'-style
declarations, and instead leaves it as "<overloaded function type>", thus
leading to a type conflict when assigning the ISRs to the interrupt vector.
This has no impact on normal use, but it makes it more compatible, nd
that's always a good thing.
Before (vector_nvic.c generated)
...
#pragma weak usart1_isr = blocking_handler
...
After:
...
void usart1_isr(void) __attribute__((weak, alias("blocking_handler")));
...
8071c6cf01