strange error message about GCC inline assembly

Question

int main()
{
    __asm__(\"movl $0x1,%%eax;
            movl $0x0,%%ebx;
            int $0x80;
            \":::\"eax\",\"ebx\");
}

I try to simul

Answer 1

You cannot have embedded newlines inside quoted strings

// bad
"two
lines"

Rewrite as

// good
"two\n"
"lines"

The preprocessor will join the strings seamlessly, to

"two\nlines"