diff --git a/lib/Target/DarwinTargetAsmInfo.cpp b/lib/Target/DarwinTargetAsmInfo.cpp
index cb73d31..7121cab 100644
--- a/lib/Target/DarwinTargetAsmInfo.cpp
+++ b/lib/Target/DarwinTargetAsmInfo.cpp
@@ -108,6 +108,7 @@
   }
 
   // FIXME: Do we have any extra special weird cases?
+  return NULL;
 }
 
 const Section*
diff --git a/lib/Target/ELFTargetAsmInfo.cpp b/lib/Target/ELFTargetAsmInfo.cpp
index 47727d1..76e0b1b 100644
--- a/lib/Target/ELFTargetAsmInfo.cpp
+++ b/lib/Target/ELFTargetAsmInfo.cpp
@@ -86,6 +86,8 @@
     }
   } else
     assert(0 && "Unsupported global");
+
+  return NULL;
 }
 
 const Section*
diff --git a/lib/Target/TargetAsmInfo.cpp b/lib/Target/TargetAsmInfo.cpp
index 5cf298a..0cf969c 100644
--- a/lib/Target/TargetAsmInfo.cpp
+++ b/lib/Target/TargetAsmInfo.cpp
@@ -342,6 +342,7 @@
    default:
     assert(0 && "Unknown section kind");
   }
+  return NULL;
 }
 
 const Section*
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 5ed6342..c282f91 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -1255,7 +1255,7 @@
     
     if (VA.isRegLoc()) {
       MVT RegVT = VA.getLocVT();
-      TargetRegisterClass *RC;
+      TargetRegisterClass *RC = NULL;
       if (RegVT == MVT::i32)
         RC = X86::GR32RegisterClass;
       else if (Is64Bit && RegVT == MVT::i64)
diff --git a/lib/Target/X86/X86TargetAsmInfo.cpp b/lib/Target/X86/X86TargetAsmInfo.cpp
index de655e7..1cf859b 100644
--- a/lib/Target/X86/X86TargetAsmInfo.cpp
+++ b/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -319,6 +319,7 @@
    default:
     assert(0 && "Unknown section kind");
   }
+  return NULL;
 }
 
 std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {