reland "[DebugInfo] Support to emit debugInfo for extern variables"

Commit d77ae1552fc21a9f3877f3ed7e13d631f517c825
("[DebugInfo] Support to emit debugInfo for extern variables")
added deebugInfo for extern variables for BPF target.
The commit is reverted by 891e25b02d760d0de18c7d46947913b3166047e7
as the committed tests using %clang instead of %clang_cc1 causing
test failed in certain scenarios as reported by Reid Kleckner.

This patch fixed the tests by using %clang_cc1.

Differential Revision: https://reviews.llvm.org/D71818

1 files changed, 26 insertions, 0 deletions

diff --git a/clang/test/CodeGen/debug-info-extern-unused.c b/clang/test/CodeGen/debug-info-extern-unused.c
new file mode 100644
index 00000000000..8b89eaab27e
--- /dev/null
+++ b/clang/test/CodeGen/debug-info-extern-unused.c
@@ -0,0 +1,26 @@
+// RUN: %clang_cc1 -x c -debug-info-kind=limited -triple bpf-linux-gnu -emit-llvm %s -o - | FileCheck %s
+
+extern char ch;
+int test() {
+  return 0;
+}
+
+int test2() {
+  extern char ch2;
+  return 0;
+}
+
+extern int (*foo)(int);
+int test3() {
+  return 0;
+}
+
+int test4() {
+  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"