From b60fe7791ef731a80d88d6ec1e327bd43896648d Mon Sep 17 00:00:00 2001
From: Misha Brukman <brukman+llvm@gmail.com>
Date: Fri, 15 Aug 2003 20:01:10 +0000
Subject: [PATCH] hash_map and hash_set: * Define HASH_NAMESPACE to `std' in
 the case of pre-3.0 GCC compilers * Add comments to clarify the intent of all
 the #ifdef madness * Add VIM directive to highlight files as C++

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7903 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/Support/hash_map | 10 +++++++---
 include/Support/hash_set |  8 ++++++--
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/include/Support/hash_map b/include/Support/hash_map
index 83480d5205a..b6eda7a0127 100644
--- a/include/Support/hash_map
+++ b/include/Support/hash_map
@@ -1,5 +1,6 @@
 //===-- Support/hash_map - "Portable" wrapper around hash_map ---*- C++ -*-===//
-//
+// vim:ft=cpp
+// 
 // This file provides a wrapper around the mysterious <hash_map> header file
 // that seems to move around between GCC releases into and out of namespaces at
 // will.  #including this header will cause hash_map to be available in the
@@ -21,19 +22,22 @@
 #include "Config/config.h"
 
 #ifdef HAVE_GNU_EXT_HASH_MAP
-
+// This is for GCC-3.1+ which puts hash in ext/hash_map
 #include <ext/hash_map>
 #define HASH_NAMESPACE __gnu_cxx
 
 #else
 
+// This is for GCC-3.0.x which puts hashmap in the `ext' directory.
 #ifdef HAVE_STD_EXT_HASH_MAP
 #include <ext/hash_map>
 #define HASH_NAMESPACE std
 
 #else
+// This handles older, pre-3.0 GCC which do not have the extentions in the `ext'
+// directory, and ignore the `std' namespace.
 #include <hash_map>
-#define HASH_NAMESPACE
+#define HASH_NAMESPACE std
 #endif
 
 #endif
diff --git a/include/Support/hash_set b/include/Support/hash_set
index e69f719ef8e..3fb4a3a78cc 100644
--- a/include/Support/hash_set
+++ b/include/Support/hash_set
@@ -1,4 +1,5 @@
 //===-- Support/hash_set - "Portable" wrapper around hash_set ---*- C++ -*-===//
+// vim:ft=cpp
 //
 // This file provides a wrapper around the mysterious <hash_set> header file
 // that seems to move around between GCC releases into and out of namespaces at
@@ -22,18 +23,22 @@
 
 #ifdef HAVE_GNU_EXT_HASH_SET
 
+// This is for GCC-3.1+ which puts hashset in ext/hash_set
 #include <ext/hash_set>
 #define HASH_NAMESPACE __gnu_cxx
 
 #else
 
+// This is for GCC-3.0.x which puts hashmap in the `ext' directory.
 #ifdef HAVE_STD_EXT_HASH_SET
 #include <ext/hash_set>
 #define HASH_NAMESPACE std
 
 #else
+// This handles older, pre-3.0 GCC which do not have the extentions in the `ext'
+// directory, and ignore the `std' namespace.
 #include <hash_set>
-#define HASH_NAMESPACE
+#define HASH_NAMESPACE std
 #endif
 
 #endif
@@ -48,4 +53,3 @@ using HASH_NAMESPACE::hash;
 #include <Support/HashExtras.h>
 
 #endif
-
-- 
2.11.0