From 568ae3aaae0a19c3973e3f1e5260138c66bf4704 Mon Sep 17 00:00:00 2001
From: Axel Naumann <Axel.Naumann@cern.ch>
Date: Fri, 5 Mar 2021 18:38:23 +0100
Subject: [PATCH] Add test for CMS fwd decl enumerator as template arg:

See https://github.com/cms-sw/cmsdist/pull/6690#issuecomment-788782759
Tests https://github.com/root-project/root/issues/7390
---
 .../dict/fwd-decl-enumconstant/CMakeLists.txt | 10 ++++++++
 cling/dict/fwd-decl-enumconstant/Hash.h       | 12 ++++++++++
 .../dict/fwd-decl-enumconstant/HashedTypes.h  | 18 ++++++++++++++
 .../fwd-decl-enumconstant/ParameterSetID.h    | 24 +++++++++++++++++++
 cling/dict/fwd-decl-enumconstant/classes.h    |  1 +
 .../execfwdDeclEnumconstant.C                 |  3 +++
 .../dict/fwd-decl-enumconstant/selection.xml  |  3 +++
 7 files changed, 71 insertions(+)
 create mode 100644 cling/dict/fwd-decl-enumconstant/CMakeLists.txt
 create mode 100644 cling/dict/fwd-decl-enumconstant/Hash.h
 create mode 100644 cling/dict/fwd-decl-enumconstant/HashedTypes.h
 create mode 100644 cling/dict/fwd-decl-enumconstant/ParameterSetID.h
 create mode 100644 cling/dict/fwd-decl-enumconstant/classes.h
 create mode 100644 cling/dict/fwd-decl-enumconstant/execfwdDeclEnumconstant.C
 create mode 100644 cling/dict/fwd-decl-enumconstant/selection.xml

diff --git a/cling/dict/fwd-decl-enumconstant/CMakeLists.txt b/cling/dict/fwd-decl-enumconstant/CMakeLists.txt
new file mode 100644
index 0000000000..1a7aceaf75
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/CMakeLists.txt
@@ -0,0 +1,10 @@
+ROOTTEST_GENERATE_REFLEX_DICTIONARY(fwdDeclEnumconstantDict
+  OPTIONS --fail_on_warnings
+  SELECTION selection.xml
+  classes.h 
+  )
+
+ROOTTEST_ADD_TEST(fwdDeclEnumconstant
+                  MACRO execfwdDeclEnumconstant.C
+                  DEPENDS fwdDeclEnumconstantDict-libgen-build
+                  LABELS roottest regression cling)
diff --git a/cling/dict/fwd-decl-enumconstant/Hash.h b/cling/dict/fwd-decl-enumconstant/Hash.h
new file mode 100644
index 0000000000..828fe26f67
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/Hash.h
@@ -0,0 +1,12 @@
+#ifndef DataFormats_Provenance_Hash_h
+#define DataFormats_Provenance_Hash_h
+
+namespace edm {
+
+  template <int I>
+  class Hash {
+  public:
+  };
+
+}  // namespace edm
+#endif
diff --git a/cling/dict/fwd-decl-enumconstant/HashedTypes.h b/cling/dict/fwd-decl-enumconstant/HashedTypes.h
new file mode 100644
index 0000000000..d85e024f70
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/HashedTypes.h
@@ -0,0 +1,18 @@
+#ifndef DataFormats_Provenance_HashedTypes_h
+#define DataFormats_Provenance_HashedTypes_h
+
+/// Declaration of the enum HashedTypes, used in defining several "id"
+/// classes.
+
+namespace edm {
+  enum HashedTypes {
+    ModuleDescriptionType,  // Obsolete
+    ParameterSetType,
+    ProcessHistoryType,
+    ProcessConfigurationType,
+    EntryDescriptionType,  // Obsolete
+    ParentageType
+  };
+}
+
+#endif  // DataFormats_Provenance_HashedTypes_h
diff --git a/cling/dict/fwd-decl-enumconstant/ParameterSetID.h b/cling/dict/fwd-decl-enumconstant/ParameterSetID.h
new file mode 100644
index 0000000000..c8a85bee08
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/ParameterSetID.h
@@ -0,0 +1,24 @@
+#ifndef DataFormats_Provenance_ParameterSetID_h
+#define DataFormats_Provenance_ParameterSetID_h
+
+/*----------------------------------------------------------------------
+  
+ParameterSetID: A globally unique identifier for each collection of
+tracked parameters. Two ParameterSet objects will have equal
+ParameterSetIDs if they contain the same set of tracked parameters.
+
+We calculate the ParameterSetID from the names and values of the
+tracked parameters within a ParameterSet, currently using the MD5
+algorithm.
+
+
+----------------------------------------------------------------------*/
+
+#include "Hash.h"
+#include "HashedTypes.h"
+
+namespace edm {
+  typedef Hash<ParameterSetType> ParameterSetID;
+
+}
+#endif
diff --git a/cling/dict/fwd-decl-enumconstant/classes.h b/cling/dict/fwd-decl-enumconstant/classes.h
new file mode 100644
index 0000000000..9ee6f7f7aa
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/classes.h
@@ -0,0 +1 @@
+#include "ParameterSetID.h"
diff --git a/cling/dict/fwd-decl-enumconstant/execfwdDeclEnumconstant.C b/cling/dict/fwd-decl-enumconstant/execfwdDeclEnumconstant.C
new file mode 100644
index 0000000000..ee59a30e47
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/execfwdDeclEnumconstant.C
@@ -0,0 +1,3 @@
+int execfwdDeclEnumconstant() {
+  return gSystem->Load("libfwdDeclEnumconstantDict_dictrflx");
+}
diff --git a/cling/dict/fwd-decl-enumconstant/selection.xml b/cling/dict/fwd-decl-enumconstant/selection.xml
new file mode 100644
index 0000000000..4cafbaa1fe
--- /dev/null
+++ b/cling/dict/fwd-decl-enumconstant/selection.xml
@@ -0,0 +1,3 @@
+<lcgdict>
+ <class name="edm::ParameterSetID"/>
+</lcgdict>