From a880209efe5a0fb82469d2deba6ebcf5636ecabc Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Wed, 15 Jan 2020 02:02:52 +0300
Subject: mingw builds: work around missing SymTagEnum

---
 include/pdb/symbol.hpp | 24 ++++++++++++++++++------
 utils/enum_symbols.cpp |  8 ++++----
 2 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/include/pdb/symbol.hpp b/include/pdb/symbol.hpp
index b9dff85..98379d8 100644
--- a/include/pdb/symbol.hpp
+++ b/include/pdb/symbol.hpp
@@ -13,12 +13,26 @@
 #include <DbgHelp.h>
 #include <Windows.h>
 
+#include <climits>
 #include <cstddef>
 #include <cstring>
 #include <stdexcept>
 #include <string>
 
 namespace pdb {
+namespace symbol {
+
+// MinGW-w64 (as of version 7.0) doesn't have SymTagEnum
+typedef ULONG Tag;
+
+constexpr Tag SYM_TAG_FUNCTION = 5;
+
+#ifdef _MSC_VER
+static_assert(static_cast<Tag>(SymTagFunction) == SYM_TAG_FUNCTION,
+              "unexpected SymTagFunction value");
+#endif
+
+} // namespace symbol
 
 class SymbolInfo {
 public:
@@ -52,13 +66,11 @@ public:
 
     Address get_offline_address() const { return raw.Address; }
 
-    typedef ULONG Tag;
-
-    Tag get_tag() const { return raw.Tag; }
+    symbol::Tag get_tag() const { return raw.Tag; }
 
-    enum class Type : Tag {
-        Function = SymTagFunction,
-        RESERVED = SymTagMax,
+    enum class Type : symbol::Tag {
+        Function = symbol::SYM_TAG_FUNCTION,
+        RESERVED = ULONG_MAX,
     };
 
     Type get_type() const { return static_cast<Type>(get_tag()); }
diff --git a/utils/enum_symbols.cpp b/utils/enum_symbols.cpp
index 77171a5..bd8a82b 100644
--- a/utils/enum_symbols.cpp
+++ b/utils/enum_symbols.cpp
@@ -25,7 +25,7 @@ public:
             "pdb", po::value<std::vector<PDB>>(&pdbs)->value_name("ADDR,PATH"), "load a PDB file");
         visible.add_options()(
             "functions",
-            po::value<pdb::Symbol::Tag>(&tag)->implicit_value(function_tag)->zero_tokens(),
+            po::value<pdb::symbol::Tag>(&tag)->implicit_value(function_tag)->zero_tokens(),
             "only list functions");
     }
 
@@ -40,10 +40,10 @@ public:
     pdb::Symbol::Type get_type() const { return static_cast<pdb::Symbol::Type>(tag); }
 
 private:
-    static const auto reserved_tag = static_cast<pdb::Symbol::Tag>(pdb::Symbol::Type::RESERVED);
-    static const auto function_tag = static_cast<pdb::Symbol::Tag>(pdb::Symbol::Type::Function);
+    static const auto reserved_tag = static_cast<pdb::symbol::Tag>(pdb::Symbol::Type::RESERVED);
+    static const auto function_tag = static_cast<pdb::symbol::Tag>(pdb::Symbol::Type::Function);
 
-    pdb::Symbol::Tag tag = reserved_tag;
+    pdb::symbol::Tag tag = reserved_tag;
 };
 
 } // namespace
-- 
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