kit

glob_addr.c (594B)

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 /* glob: take the address of a file-scope global and pass it to a noinline
  * function that mutates through the pointer. Codegen materializes &g with
  * adrp/add (ADR_PREL_PG_HI21 + ADD_ABS_LO12_NC against `g`) into the arg
  * register, and the callee does a plain indirect store. `g` is initialized
  * nonzero to keep it in .data (a .bss global hits the SHT_NOBITS assembler gap
  * — see glob_bss_write.skip). Exit: g set to 42. */
 int g = 1;
 __attribute__((noinline)) static void set42(int* p) { *p = 42; }
 int test_main(void) {
   set42(&g); /* adrp/add &g -> x0, bl set42 */
   return g;
 }