hanchenye-llvm-project/clang/test/CodeGen/private-extern.c

// RUN: clang-cc -emit-llvm -o %t %s &&
// RUN: grep '@g0 = external hidden constant i32' %t &&
// RUN: grep '@g1 = hidden constant i32 1' %t

__private_extern__ const int g0;
__private_extern__ const int g1 = 1;

int f0(void) {
  return g0;
}