boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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078-voidptr-arith.c (425B)

      1 /* void* arithmetic via the GCC byte-arithmetic extension.
      2  *
      3  * tcc.c relies on `void *p; p + N` being byte-stride pointer
      4  * arithmetic. Strict C99 disallows it (no arithmetic on void*); we
      5  * follow GCC and tcc-mes.
      6  *
      7  * Buffer: { 'A', 'B', 'C', 'D', 0 }. void* + 2 + cast to char* + deref
      8  * yields 'C' = 67.
      9  */
     10 
     11 char buf[] = "ABCD";
     12 
     13 int main(void) {
     14     void *p = buf;
     15     char *q = (char *)(p + 2);
     16     return *q;
     17 }