clang: Enable compiling gem5 using clang 2.9 and 3.0

This patch adds the necessary flags to the SConstruct and SConscript
files for compiling using clang 2.9 and later (on Ubuntu et al and OSX
XCode 4.2), and also cleans up a bunch of compiler warnings found by
clang. Most of the warnings are related to hidden virtual functions,
comparisons with unsigneds >= 0, and if-statements with empty
bodies. A number of mismatches between struct and class are also
fixed. clang 2.8 is not working as it has problems with class names
that occur in multiple namespaces (e.g. Statistics in
kernel_stats.hh).

clang has a bug (http://llvm.org/bugs/show_bug.cgi?id=7247) which
causes confusion between the container std::set and the function
Packet::set, and this is currently addressed by not including the
entire namespace std, but rather selecting e.g. "using std::vector" in
the appropriate places.

5 files changed, 6 insertions, 7 deletions

diff --git a/src/mem/cache/base.hh b/src/mem/cache/base.hh
index df72e197f..3020613ca 100644
--- a/src/mem/cache/base.hh
+++ b/src/mem/cache/base.hh
@@ -73,6 +73,7 @@ class BaseCache : public MemObject
         MSHRQueue_WriteBuffer
     };
 
+  public:
     /**
      * Reasons for caches to be blocked.
      */
@@ -83,7 +84,6 @@ class BaseCache : public MemObject
         NUM_BLOCKED_CAUSES
     };
 
-  public:
     /**
      * Reasons for cache to request a bus.
      */
@@ -94,7 +94,7 @@ class BaseCache : public MemObject
         NUM_REQUEST_CAUSES
     };
 
-  private:
+  protected:
 
     class CachePort : public SimpleTimingPort
     {
@@ -138,7 +138,6 @@ class BaseCache : public MemObject
         }
     };
 
-  public: //Made public so coherence can get at it.
     CachePort *cpuSidePort;
     CachePort *memSidePort;
 
diff --git a/src/mem/cache/tags/iic.cc b/src/mem/cache/tags/iic.cc
index 71c3ba48c..acce3ffc8 100644
--- a/src/mem/cache/tags/iic.cc
+++ b/src/mem/cache/tags/iic.cc
@@ -187,7 +187,7 @@ IIC::regStats(const string &name)
         .flags(pdf)
         ;
 
-    repl->regStats(name);
+    repl->regStatsWithSuffix(name);
 
     if (PROFILE_IIC)
         setAccess
diff --git a/src/mem/cache/tags/iic_repl/gen.cc b/src/mem/cache/tags/iic_repl/gen.cc
index 7a1e7a110..137130b27 100644
--- a/src/mem/cache/tags/iic_repl/gen.cc
+++ b/src/mem/cache/tags/iic_repl/gen.cc
@@ -184,7 +184,7 @@ GenRepl::add(unsigned long tag_index)
 }
 
 void
-GenRepl::regStats(const string name)
+GenRepl::regStatsWithSuffix(const string name)
 {
     using namespace Stats;
 
diff --git a/src/mem/cache/tags/iic_repl/gen.hh b/src/mem/cache/tags/iic_repl/gen.hh
index fe105d95a..cbd15a6fd 100644
--- a/src/mem/cache/tags/iic_repl/gen.hh
+++ b/src/mem/cache/tags/iic_repl/gen.hh
@@ -209,7 +209,7 @@ class GenRepl : public Repl
      * Register statistics.
      * @param name The name to prepend to statistic descriptions.
      */
-    virtual void regStats(const std::string name);
+    virtual void regStatsWithSuffix(const std::string name);
 
     /**
      * Update the tag pointer to when the tag moves.
diff --git a/src/mem/cache/tags/iic_repl/repl.hh b/src/mem/cache/tags/iic_repl/repl.hh
index 994af5164..51d8169e9 100644
--- a/src/mem/cache/tags/iic_repl/repl.hh
+++ b/src/mem/cache/tags/iic_repl/repl.hh
@@ -102,7 +102,7 @@ class Repl : public SimObject
      * Register statistics.
      * @param name The name to prepend to statistic descriptions.
      */
-    virtual void regStats(const std::string name) = 0;
+    virtual void regStatsWithSuffix(const std::string name) = 0;
 
     /**
      * Update the tag pointer to when the tag moves.