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.

4 files changed, 20 insertions, 20 deletions

diff --git a/src/arch/x86/bios/acpi.hh b/src/arch/x86/bios/acpi.hh
index 5040c434c..b10b18092 100644
--- a/src/arch/x86/bios/acpi.hh
+++ b/src/arch/x86/bios/acpi.hh
@@ -48,11 +48,11 @@
 
 class Port;
 
-class X86ACPIRSDPParams;
+struct X86ACPIRSDPParams;
 
-class X86ACPISysDescTableParams;
-class X86ACPIRSDTParams;
-class X86ACPIXSDTParams;
+struct X86ACPISysDescTableParams;
+struct X86ACPIRSDTParams;
+struct X86ACPIXSDTParams;
 
 namespace X86ISA
 {
diff --git a/src/arch/x86/bios/intelmp.cc b/src/arch/x86/bios/intelmp.cc
index 974af28a5..4c9c61adb 100644
--- a/src/arch/x86/bios/intelmp.cc
+++ b/src/arch/x86/bios/intelmp.cc
@@ -72,7 +72,7 @@ template<class T>
 uint8_t
 writeOutField(PortProxy* proxy, Addr addr, T val)
 {
-    T guestVal = X86ISA::htog(val);
+    uint64_t guestVal = X86ISA::htog(val);
     proxy->writeBlob(addr, (uint8_t *)(&guestVal), sizeof(T));
 
     uint8_t checkSum = 0;
diff --git a/src/arch/x86/bios/intelmp.hh b/src/arch/x86/bios/intelmp.hh
index 0ddb62b8d..4b730ad4b 100644
--- a/src/arch/x86/bios/intelmp.hh
+++ b/src/arch/x86/bios/intelmp.hh
@@ -54,24 +54,24 @@
 class PortProxy;
 
 // Config entry types
-class X86IntelMPBaseConfigEntryParams;
-class X86IntelMPExtConfigEntryParams;
+struct X86IntelMPBaseConfigEntryParams;
+struct X86IntelMPExtConfigEntryParams;
 
 // General table structures
-class X86IntelMPConfigTableParams;
-class X86IntelMPFloatingPointerParams;
+struct X86IntelMPConfigTableParams;
+struct X86IntelMPFloatingPointerParams;
 
 // Base entry types
-class X86IntelMPBusParams;
-class X86IntelMPIOAPICParams;
-class X86IntelMPIOIntAssignmentParams;
-class X86IntelMPLocalIntAssignmentParams;
-class X86IntelMPProcessorParams;
+struct X86IntelMPBusParams;
+struct X86IntelMPIOAPICParams;
+struct X86IntelMPIOIntAssignmentParams;
+struct X86IntelMPLocalIntAssignmentParams;
+struct X86IntelMPProcessorParams;
 
 // Extended entry types
-class X86IntelMPAddrSpaceMappingParams;
-class X86IntelMPBusHierarchyParams;
-class X86IntelMPCompatAddrSpaceModParams;
+struct X86IntelMPAddrSpaceMappingParams;
+struct X86IntelMPBusHierarchyParams;
+struct X86IntelMPCompatAddrSpaceModParams;
 
 namespace X86ISA
 {
diff --git a/src/arch/x86/bios/smbios.hh b/src/arch/x86/bios/smbios.hh
index 9fa6cd6dc..805b03fbb 100644
--- a/src/arch/x86/bios/smbios.hh
+++ b/src/arch/x86/bios/smbios.hh
@@ -52,9 +52,9 @@
 #include "sim/sim_object.hh"
 
 class PortProxy;
-class X86SMBiosBiosInformationParams;
-class X86SMBiosSMBiosStructureParams;
-class X86SMBiosSMBiosTableParams;
+struct X86SMBiosBiosInformationParams;
+struct X86SMBiosSMBiosStructureParams;
+struct X86SMBiosSMBiosTableParams;
 
 namespace X86ISA
 {