diff --git a/include/chaiscript/dispatchkit/boxed_value.hpp b/include/chaiscript/dispatchkit/boxed_value.hpp
index c2cd20e..8b3d763 100644
--- a/include/chaiscript/dispatchkit/boxed_value.hpp
+++ b/include/chaiscript/dispatchkit/boxed_value.hpp
@@ -251,9 +251,9 @@ namespace chaiscript
           ~Sentinel()
           {
             // save new pointer data
-            const auto ptr = m_ptr.get().get();
-            m_data.get().m_data_ptr = ptr;
-            m_data.get().m_const_data_ptr = ptr;
+            const auto ptr_ = m_ptr.get().get();
+            m_data.get().m_data_ptr = ptr_;
+            m_data.get().m_const_data_ptr = ptr_;
           }
 
           Sentinel& operator=(Sentinel&&s) = default;
diff --git a/include/chaiscript/language/chaiscript_parser.hpp b/include/chaiscript/language/chaiscript_parser.hpp
index f0b57f0..c703fb4 100644
--- a/include/chaiscript/language/chaiscript_parser.hpp
+++ b/include/chaiscript/language/chaiscript_parser.hpp
@@ -2261,14 +2261,14 @@ namespace chaiscript
       /// Reads a unary prefixed expression from input
       bool Prefix() {
         const auto prev_stack_top = m_match_stack.size();
-        using SS = utility::Static_String;
-        constexpr const std::array<utility::Static_String, 6> prefix_opers{
-            SS{"++"}, 
-            SS{"--"}, 
-            SS{"-"}, 
-            SS{"+"}, 
-            SS{"!"}, 
-            SS{"~"}};
+        constexpr const std::array<utility::Static_String, 6> prefix_opers{{
+            "++", 
+            "--", 
+            "-", 
+            "+", 
+            "!", 
+            "~"
+        }};
 
         for (const auto &oper : prefix_opers)
         {
@@ -2426,7 +2426,7 @@ namespace chaiscript
         using SS = utility::Static_String;
 
         if (Operator()) {
-          for (const auto sym : {SS{"="}, SS{":="}, SS{"+="}, SS{"-="}, SS{"*="}, SS{"/="}, SS{"%="}, SS{"<<="}, SS{">>="}, SS{"&="}, SS{"^="}, SS{"|="}}) 
+          for (const auto &sym : {SS{"="}, SS{":="}, SS{"+="}, SS{"-="}, SS{"*="}, SS{"/="}, SS{"%="}, SS{"<<="}, SS{">>="}, SS{"&="}, SS{"^="}, SS{"|="}}) 
           {
             if (Symbol(sym, true)) {
               SkipWS(true);
diff --git a/include/chaiscript/utility/fnv1a.hpp b/include/chaiscript/utility/fnv1a.hpp
index 54378cd..b8c0187 100644
--- a/include/chaiscript/utility/fnv1a.hpp
+++ b/include/chaiscript/utility/fnv1a.hpp
@@ -21,6 +21,11 @@ namespace chaiscript
 
 
     static constexpr std::uint32_t fnv1a_32(const char *s, std::uint32_t h = 0x811c9dc5) {
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wsign-conversion"
+#endif
+
 #ifdef CHAISCRIPT_MSVC
 #pragma warning(push)
 #pragma warning(disable : 4307)
@@ -29,6 +34,11 @@ namespace chaiscript
 #ifdef CHAISCRIPT_MSVC
 #pragma warning(pop)
 #endif
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
     }
 
 
diff --git a/unittests/compiled_tests.cpp b/unittests/compiled_tests.cpp
index 9d75519..8bebc92 100644
--- a/unittests/compiled_tests.cpp
+++ b/unittests/compiled_tests.cpp
@@ -1202,7 +1202,7 @@ TEST_CASE("Test reference member being registered")
   double d;
   chai.add(chaiscript::var(Reference_MyClass(d)), "ref");
   chai.eval("ref.x = 2.3");
-  CHECK(d == 2.3);
+  CHECK(d == Approx(2.3));
 }
 
 
diff --git a/unittests/integer_literal_test.cpp b/unittests/integer_literal_test.cpp
index bd5ef10..4c20f28 100644
--- a/unittests/integer_literal_test.cpp
+++ b/unittests/integer_literal_test.cpp
@@ -204,30 +204,30 @@ int main()
       && TEST_LITERAL(16777215u)
       && TEST_LITERAL(4294967295u)
 
-      && TEST_LITERAL(-255u)
-      && TEST_LITERAL(-65535u)
-      && TEST_LITERAL(-16777215u)
-      && TEST_LITERAL(-4294967295u)
+      && TEST_LITERAL_SIGNED(-255u)
+      && TEST_LITERAL_SIGNED(-65535u)
+      && TEST_LITERAL_SIGNED(-16777215u)
+      && TEST_LITERAL_SIGNED(-4294967295u)
 
       && TEST_LITERAL(255l)
       && TEST_LITERAL(65535l)
       && TEST_LITERAL(16777215l)
       && TEST_LITERAL(4294967295l)
 
-      && TEST_LITERAL(-255l)
-      && TEST_LITERAL(-65535l)
-      && TEST_LITERAL(-16777215l)
-      && TEST_LITERAL(-4294967295l)
+      && TEST_LITERAL_SIGNED(-255l)
+      && TEST_LITERAL_SIGNED(-65535l)
+      && TEST_LITERAL_SIGNED(-16777215l)
+      && TEST_LITERAL_SIGNED(-4294967295l)
 
       && TEST_LITERAL(255ul)
       && TEST_LITERAL(65535ul)
       && TEST_LITERAL(16777215ul)
       && TEST_LITERAL(4294967295ul)
 
-      && TEST_LITERAL(-255ul)
-      && TEST_LITERAL(-65535ul)
-      && TEST_LITERAL(-16777215ul)
-      && TEST_LITERAL(-4294967295ul)
+      && TEST_LITERAL_SIGNED(-255ul)
+      && TEST_LITERAL_SIGNED(-65535ul)
+      && TEST_LITERAL_SIGNED(-16777215ul)
+      && TEST_LITERAL_SIGNED(-4294967295ul)
 
       && TEST_LITERAL(255ull)
       && TEST_LITERAL(65535ull)