Add cdb test for global constants

[akhuang]

Summary

This creates an integration test for global constants

[rnk]

lgtm

This should be running here now:
http://lab.llvm.org:8011/builders/clang-x64-windows-msvc
I'd suggest checking if it's green tomorrow.

debuginfo-tests/win_cdb/global-constant.cpp

28–29

Please add a comment indicating why this is intended behavior. ENUM_POS is unused, so it never ends up in the globals stream, so we expect this to fail.

[akhuang]

• add comment

debuginfo-tests/win_cdb/global-constant.cpp

+// RUN: %clang_cl %s -o %t.exe -fuse-ld=lld -Z7
+// RUN: grep DE[B]UGGER: %s | sed -e 's/.*DE[B]UGGER: //' > %t.script
+// RUN: %cdb -cf %t.script %t.exe | FileCheck %s --check-prefixes=DEBUGGER,CHECK
+
+// Check that global constants have debug info.
+
+const float TestPi = 3.14;
+struct S {
+  static const char TestCharA = 'a';
+};
+enum TestEnum : int {
+  ENUM_POS = 2147000000,
+  ENUM_NEG = -2147000000,
+};
+void useConst(int) {}
+int main() {
+  useConst(TestPi);
+  useConst(S::TestCharA);
+  useConst(ENUM_NEG);
+  // DEBUGGER: g
+  // DEBUGGER: ?? TestPi
+  // CHECK: float 3.140000105
+  // DEBUGGER: ?? S::TestCharA
+  // CHECK: char 0n97 'a'
+  // DEBUGGER: ?? ENUM_NEG
+  // CHECK: TestEnum ENUM_NEG (0n-2147000000)
+  // Unused constants shouldn't show up in the globals stream.
+  // DEBUGGER: ?? ENUM_POS
+  // CHECK: Couldn't resolve error at 'ENUM_POS'
+  // DEBUGGER: q
+  __debugbreak();
+  return 0;
+}