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-ftrapv
Instructs the compiler to generate traps for signed arithmetic overflow on addition, subtraction, and multiplication operations.
Usage
Where an overflow is detected, an undefined instruction is inserted into the assembly code. In order for the overflow to get caught, an undefined instruction handler must be provided.
Note
When both -fwrapv and -ftrapv are used in a single command, the
furthest-right option overrides the other.
For example, here -ftrapv
overrides -fwrapv:
armclang --target=aarch64-arm-none-eabi -fwrapv -c -ftrapv
hello.c