rustllvm: Stub out some functions for llvm < 3.5

Author: luqmana

src/rustllvm/RustWrapper.cpp

@@ -113,6 +113,8 @@ extern "C" void LLVMAddCallSiteAttribute(LLVMValueRef Instr, unsigned index, uin
                                                          index, B)));
 }
 
+
+#if LLVM_VERSION_MINOR >= 5
 extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef Instr, unsigned idx, uint64_t b) {
   CallSite Call = CallSite(unwrap<Instruction>(Instr));
   AttrBuilder B;
@@ -122,6 +124,9 @@ extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef Instr, unsigned
                                        AttributeSet::get(Call->getContext(),
                                                          idx, B)));
 }
+#else
+extern "C" void LLVMAddDereferenceableCallSiteAttr(LLVMValueRef, unsigned, uint64_t) {}
+#endif
 
 extern "C" void LLVMAddFunctionAttribute(LLVMValueRef Fn, unsigned index, uint64_t Val) {
   Function *A = unwrap<Function>(Fn);
@@ -130,12 +135,16 @@ extern "C" void LLVMAddFunctionAttribute(LLVMValueRef Fn, unsigned index, uint64
   A->addAttributes(index, AttributeSet::get(A->getContext(), index, B));
 }
 
+#if LLVM_VERSION_MINOR >= 5
 extern "C" void LLVMAddDereferenceableAttr(LLVMValueRef Fn, unsigned index, uint64_t bytes) {
   Function *A = unwrap<Function>(Fn);
   AttrBuilder B;
   B.addDereferenceableAttr(bytes);
   A->addAttributes(index, AttributeSet::get(A->getContext(), index, B));
 }
+#else
+extern "C" void LLVMAddDereferenceableAttr(LLVMValueRef, unsigned, uint64_t) {}
+#endif
 
 extern "C" void LLVMAddFunctionAttrString(LLVMValueRef Fn, unsigned index, const char *Name) {
   Function *F = unwrap<Function>(Fn);