compiler-rt/test/msan/memcmp_test.cpp

   1 // RUN: %clangxx_msan -O0 -g %s -o %t
   2 // RUN: not %run %t 2>&1 | FileCheck %s
   3 // RUN: MSAN_OPTIONS=intercept_memcmp=0 %run %t
   4
   5 #include <string.h>
   6 #include <stdio.h>
   7 int main(int argc, char **argv) {
   8   char a1[4];
   9   char a2[4];
  10   for (int i = 0; i < argc * 3; i++)
  11     a2[i] = a1[i] = i;
  12   int res = memcmp(a1, a2, 4);
  13   if (!res)
  14     printf("equals");
  15   return 0;
  16   // CHECK: Uninitialized bytes in MemcmpInterceptorCommon at offset 3
  17   // CHECK: MemorySanitizer: use-of-uninitialized-value
  18 }