How to check border in gcc / mingw?

Question

Having tried it

int main (void) {

int a [10]; and [20] = 5;

}

gcc -wall -O2 main.c

This does not give me a warning ...

This is gcc in windows (mingw), and I cannot detect this border restriction error

how to tell the compiler to check it? can it do that?

thank

Answer 1

There are attempts to cope with checking the boundaries of the array. By default, the santdard C99 says nothing about applying array boundaries, I suppose, mainly because it has more overhead.

So you can look at sites like these, where people tried to deal with this:

http://williambader.com/bounds/example.html

Answer 2

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Answer 3

, , , . , gcc, clang (, ). .

, 4, 4:

    ex9.c:17:2: warning: array index 4 is past the end of the array (which contains
          4 elements) [-Warray-bounds]
            numbers[4] = 4;
            ^       ~
    ex9.c:4:2: note: array 'numbers' declared here
            int numbers[4] = {0};
            ^

Kajal