diff --git a/src/compiler/codegen/mips/MipsRallocUtil.cc b/src/compiler/codegen/mips/MipsRallocUtil.cc
index 22a19db..41bc991 100644
--- a/src/compiler/codegen/mips/MipsRallocUtil.cc
+++ b/src/compiler/codegen/mips/MipsRallocUtil.cc
@@ -151,6 +151,13 @@
     return res;
 }
 
+extern RegLocation oatGetReturnAlt(CompilationUnit* cUnit)
+{
+    UNIMPLEMENTED(FATAL);
+    RegLocation res = LOC_C_RETURN;
+    return res;
+}
+
 extern RegLocation oatGetReturn(CompilationUnit* cUnit)
 {
     RegLocation res = LOC_C_RETURN;
diff --git a/src/compiler/codegen/x86/X86/Factory.cc b/src/compiler/codegen/x86/X86/Factory.cc
index cf8ef81..9746707 100644
--- a/src/compiler/codegen/x86/X86/Factory.cc
+++ b/src/compiler/codegen/x86/X86/Factory.cc
@@ -144,6 +144,12 @@
 
 LIR *loadMultiple(CompilationUnit *cUnit, int rBase, int rMask);
 
+LIR* opBranchUnconditional(CompilationUnit* cUnit, OpKind op)
+{
+    UNIMPLEMENTED(WARNING) << "opBranchUnconditional";
+    return NULL;
+}
+
 LIR* opCondBranch(CompilationUnit* cUnit, ConditionCode cc, LIR* target)
 {
     UNIMPLEMENTED(WARNING) << "opCondBranch";
diff --git a/src/compiler/codegen/x86/X86RallocUtil.cc b/src/compiler/codegen/x86/X86RallocUtil.cc
index cd630a8..cdd75a1 100644
--- a/src/compiler/codegen/x86/X86RallocUtil.cc
+++ b/src/compiler/codegen/x86/X86RallocUtil.cc
@@ -185,4 +185,11 @@
     ((LIR*)lir)->flags.isNop = true;
 }
 
+extern RegLocation oatGetReturnAlt(CompilationUnit* cUnit)
+{
+    UNIMPLEMENTED(FATAL);
+    RegLocation res = LOC_C_RETURN;
+    return res;
+}
+
 }  // namespace art