Some things to make gcc happy

A couple build issues left though.

src/asm_writing/rewriter.cpp

@@ -566,7 +566,8 @@ void Rewriter::_decref(RewriterVar* var) {
     assembler->decq(assembler::Immediate(&_Py_RefTotal));
 #endif
 
-    _setupCall(true, llvm::ArrayRef<RewriterVar*>(&var, 1), llvm::ArrayRef<RewriterVar*>(NULL, (int)0), assembler::RAX);
+    _setupCall(true, llvm::ArrayRef<RewriterVar*>(&var, 1), llvm::ArrayRef<RewriterVar*>(NULL, (size_t)0),
+               assembler::RAX);
 
 
 #ifdef Py_REF_DEBUG
@@ -601,7 +602,7 @@ void Rewriter::_xdecref(RewriterVar* var) {
     //assembler->trap();
 
     this->_call(NULL, true, (void*)Helper::xdecref, llvm::ArrayRef<RewriterVar*>(&var, 1),
-                llvm::ArrayRef<RewriterVar*>(NULL, (int)0));
+                llvm::ArrayRef<RewriterVar*>(NULL, (size_t)0));
 
     // Doesn't call bumpUse, since this function is designed to be callable from other emitting functions.
     // (ie the caller should call bumpUse)

src/capi/object.cpp

@@ -1145,8 +1145,10 @@ extern "C" void _Py_NegativeRefcount(const char* fname, int lineno, PyObject* op
 
 #endif /* Py_REF_DEBUG */
 
-extern "C" int _PyTrash_delete_nesting = 0;
-extern "C" PyObject *_PyTrash_delete_later = NULL;
+extern "C" {
+int _PyTrash_delete_nesting = 0;
+PyObject *_PyTrash_delete_later = NULL;
+}
 
 extern "C" void _PyTrash_thread_deposit_object(PyObject* op) noexcept {
     Py_FatalError("unimplemented");

src/codegen/irgen/refcounts.cpp

@@ -173,7 +173,7 @@ void addIncrefs(llvm::Value* v, bool nullable, int num_refs, llvm::Instruction*
     assert(num_refs > 0);
 
     llvm::BasicBlock* cur_block;
-    llvm::BasicBlock* continue_block;
+    llvm::BasicBlock* continue_block = NULL;
     llvm::BasicBlock* incref_block;
 
     llvm::IRBuilder<true> builder(incref_pt);