llvm/clang/test/CodeGen/debug-info-extern-unused.c

// RUN: %clang_cc1 -x c -debug-info-kind=limited -triple bpf-linux-gnu -emit-llvm %s -o - | FileCheck %s

extern char ch;
int test(void) {
  return 0;
}

int test2(void) {
  extern char ch2;
  return 0;
}

extern int (*foo)(int);
int test3(void) {
  return 0;
}

int test4(void) {
  extern int (*foo2)(int);
  return 0;
}

// CHECK-NOT: distinct !DIGlobalVariable(name: "ch"
// CHECK-NOT: distinct !DIGlobalVariable(name: "ch2"
// CHECK-NOT: distinct !DIGlobalVariable(name: "foo"
// CHECK-NOT: distinct !DIGlobalVariable(name: "foo2"