--- a/flutter/impeller/compiler/reflector.cc
+++ b/flutter/impeller/compiler/reflector.cc
@@ -701,7 +701,7 @@
     auto location = compiler_->get_decoration(
         resource.id, spv::Decoration::DecorationLocation);
     // Malformed shader, will be caught later on.
-    if (location >= resources.size() || location < 0) {
+    if (location >= resources.size()) {
       location = 0;
     }
     offsets[location] = (type.width * type.vecsize) / 8;
--- a/flutter/impeller/compiler/runtime_stage_data.cc
+++ b/flutter/impeller/compiler/runtime_stage_data.cc
@@ -183,7 +183,7 @@
 
 static const char* kFormatVersionKey = "format_version";
 static const char* kStageKey = "stage";
-static const char* kTargetPlatformKey = "target_platform";
+[[maybe_unused]] static const char* kTargetPlatformKey = "target_platform";
 static const char* kEntrypointKey = "entrypoint";
 static const char* kUniformsKey = "uniforms";
 static const char* kShaderKey = "shader";
@@ -194,7 +194,8 @@
 static const char* kUniformColumnsKey = "columns";
 static const char* kUniformBitWidthKey = "bit_width";
 static const char* kUniformArrayElementsKey = "array_elements";
-static const char* kUniformStructElementsKey = "struct_elements";
+[[maybe_unused]] static const char* kUniformStructElementsKey =
+    "struct_elements";
 
 static std::string RuntimeStageBackendToString(RuntimeStageBackend backend) {
   switch (backend) {
@@ -209,6 +210,7 @@
     case RuntimeStageBackend::kOpenGLES3:
       return "opengles3";
   }
+  FML_UNREACHABLE();
 }
 
 std::shared_ptr<fml::Mapping> RuntimeStageData::CreateJsonMapping() const {
--- a/flutter/impeller/compiler/types.cc
+++ b/flutter/impeller/compiler/types.cc
@@ -96,6 +96,7 @@
     case SourceLanguage::kHLSL:
       return "HLSL";
   }
+  FML_UNREACHABLE();
 }
 
 std::string EntryPointFunctionNameFromSourceName(