Illegal instruction error Positioning---ignoring the cost of compile-time warnings

In the original computer's Linux C + + program can run correctly, but changed a machine to run a fatal error, the program is directly dropped, error prompts as follows:

Illegal instruction (core dumped)

The main reason for the error is that we take a look at the compile prompt, warning as follows:

/home/xxx/src/aa. CPP:621:1: Warning:       control reaches end of nonfunction [-wreturn- Type]} ^

Careful review of the code found that the function is less return value, the pain is very, actually compiled also passed, just a warning.

This tells us an important fact: the compile-time warning is very important!

Resources

[1]. A low-level illegal instruction wrong position------ignore compile-time warnings to double-pay.

Illegal instruction error Positioning---ignoring the cost of compile-time warnings