From 2e04480f21298262daa5c6d9b0d1b24c52f00756 Mon Sep 17 00:00:00 2001
From: Peter Powell <petpow@saberuk.com>
Date: Fri, 4 Jan 2013 18:22:29 +0000
Subject: [PATCH] Use the preprocessor to detect whether hash_map is available.

---
 configure          |  9 ---------
 include/hash_map.h | 10 ++++++----
 2 files changed, 6 insertions(+), 13 deletions(-)

diff --git a/configure b/configure
index 8f9f20350..cd5cf4258 100755
--- a/configure
+++ b/configure
@@ -904,15 +904,6 @@ print FILEHANDLE "#define MAXBUF " . ($config{MAXBUF}+2) . "\n";
 		if ($config{GCCVER} >= 3) {
 			print FILEHANDLE "#define GCC3\n";
 		}
-		if (
-			(($config{GCCVER} == 4) && ($config{GCCMINOR} >= 3))
-				||
-			($config{GCCVER} > 4)
-				|| # HACK: temporary fix for non-GCC (i.e. clang) builds
-			($config{CC} !~ /gcc/)
-		) {
-			print FILEHANDLE "#define HASHMAP_DEPRECATED\n";
-		}
 		if ($config{HAS_STRLCPY} eq "true") {
 			print FILEHANDLE "#define HAS_STRLCPY\n";
 		}
diff --git a/include/hash_map.h b/include/hash_map.h
index 6be2da6ca..1b43f0118 100644
--- a/include/hash_map.h
+++ b/include/hash_map.h
@@ -22,17 +22,19 @@
 
 #ifndef INSPIRCD_HASHMAP_H
 #define INSPIRCD_HASHMAP_H
-
-#include "inspircd_config.h"
-
+ 
 	/** Where hash_map is varies from compiler to compiler
 	 * as it is not standard unless we have tr1.
+	 *
+	 * TODO: in 2.2 if we drop support for libstdc++ older than 3.4.7 and GCC older
+	 *       than 4.1 this can be cleaned up massively.
 	 */
 	#ifndef _WIN32
-		#ifdef HASHMAP_DEPRECATED
+		#if __GLIBCXX__ > 20060309
 			// GCC4+ has deprecated hash_map and uses tr1. But of course, uses a different include to MSVC. FOR FUCKS SAKE.
 			#include <tr1/unordered_map>
 			#define HAS_TR1_UNORDERED
+			#define HASHMAP_DEPRECATED
 		#else
 			#include <ext/hash_map>
 			/** Oddball linux namespace for hash_map */
-- 
2.39.2