scons: Use c++0x with gcc >= 4.4 instead of 4.6

This patch shifts the version of gcc for which we enable c++0x from
4.6 to 4.4 The more long term plan is to see what the c++0x features
can bring and what level of support would be enabled simply by bumping
the required version of gcc from 4.3 to 4.4.

A few minor things had to be fixed in the code base, most notably the
choice of a hashmap implementation. In the Ruby Sequencer there were
also a few minor issues that gcc 4.4 was not too happy about.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/mem/ruby/system/Sequencer.cc b/src/mem/ruby/system/Sequencer.cc
index efb0b002e..854d360ac 100644
--- a/src/mem/ruby/system/Sequencer.cc
+++ b/src/mem/ruby/system/Sequencer.cc
@@ -214,6 +214,11 @@ Sequencer::insertRequest(PacketPtr pkt, RubyRequestType request_type)
 
     Address line_addr(pkt->getAddr());
     line_addr.makeLineAddress();
+    // Create a default entry, mapping the address to NULL, the cast is
+    // there to make gcc 4.4 happy
+    RequestTable::value_type default_entry(line_addr,
+                                           (SequencerRequest*) NULL);
+
     if ((request_type == RubyRequestType_ST) ||
         (request_type == RubyRequestType_RMW_Read) ||
         (request_type == RubyRequestType_RMW_Write) ||
@@ -231,7 +236,7 @@ Sequencer::insertRequest(PacketPtr pkt, RubyRequestType request_type)
         }
 
         pair<RequestTable::iterator, bool> r =
-            m_writeRequestTable.insert(RequestTable::value_type(line_addr, 0));
+            m_writeRequestTable.insert(default_entry);
         if (r.second) {
             RequestTable::iterator i = r.first;
             i->second = new SequencerRequest(pkt, request_type,
@@ -251,7 +256,7 @@ Sequencer::insertRequest(PacketPtr pkt, RubyRequestType request_type)
         }
 
         pair<RequestTable::iterator, bool> r =
-            m_readRequestTable.insert(RequestTable::value_type(line_addr, 0));
+            m_readRequestTable.insert(default_entry);
 
         if (r.second) {
             RequestTable::iterator i = r.first;