diff --git a/Cedar.xcodeproj/project.pbxproj b/Cedar.xcodeproj/project.pbxproj
index d3589ae4..95f9872b 100644
--- a/Cedar.xcodeproj/project.pbxproj
+++ b/Cedar.xcodeproj/project.pbxproj
@@ -4994,6 +4994,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_NS_ASSERTIONS = NO;
 				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				HEADER_SEARCH_PATHS = (
diff --git a/scripts/rake/helpers/simulator.rb b/scripts/rake/helpers/simulator.rb
index 51f5f51e..1fe55409 100644
--- a/scripts/rake/helpers/simulator.rb
+++ b/scripts/rake/helpers/simulator.rb
@@ -6,8 +6,10 @@ def self.launch(app_dir, app_name, logfile)
     Shell.with_env({"CEDAR_REPORTER_CLASS" => "CDRColorizedReporter"}) do
       begin
         kill # ensure simulator is not currently running
-        Shell.run "ios-sim launch #{File.join(app_dir, "#{app_name}.app").inspect} --devicetypeid \"com.apple.CoreSimulator.SimDeviceType.iPhone-5s, #{SDK_RUNTIME_VERSION}\" --verbose --stdout build/uispecs.spec.log"
-        Shell.run "grep -q ', 0 failures' build/uispecs.spec.log", logfile
+        Shell.run "rm -rf #{logfile}"
+        Shell.run "ios-sim launch #{File.join(app_dir, "#{app_name}.app").inspect} --devicetypeid \"com.apple.CoreSimulator.SimDeviceType.iPhone-5s, #{SDK_RUNTIME_VERSION}\" --verbose --stdout #{logfile}"
+        Shell.run "grep -q ', 0 failures' #{logfile}"                # Fail unless we find the literal string '0 failures', this is to prevent the tests going green if the test runner itself crashes before it logs ANY output
+        Shell.run "! grep -q ', [1-9][0-9]* failures' #{logfile}"    # Fail if we find any number of failures
       rescue
         retry_count += 1
 
diff --git a/scripts/rake/tasks/spec_suites.rb b/scripts/rake/tasks/spec_suites.rb
index c13cd49f..38baaadb 100644
--- a/scripts/rake/tasks/spec_suites.rb
+++ b/scripts/rake/tasks/spec_suites.rb
@@ -52,7 +52,7 @@
       }
 
       Shell.with_env(env_vars) do
-        Simulator.launch(Xcode.build_dir("-iphonesimulator"), UI_SPECS_TARGET_NAME, "uispecs.run.log")
+        Simulator.launch(Xcode.build_dir("-iphonesimulator"), UI_SPECS_TARGET_NAME, Xcode.build_dir("-uispecs.run.log"))
       end
     end
   end
@@ -107,7 +107,7 @@
       }
 
       Shell.with_env(env_vars) do
-        Simulator.launch(Xcode.build_dir("-iphonesimulator"), IOS_STATIC_FRAMEWORK_SPECS_TARGET_NAME, "frameworks.ios.static.specs.run.log")
+        Simulator.launch(Xcode.build_dir("-iphonesimulator"), IOS_STATIC_FRAMEWORK_SPECS_TARGET_NAME, Xcode.build_dir("-frameworks.ios.static.specs.run.log"))
       end
     end
   end
@@ -134,7 +134,7 @@
       }
 
       Shell.with_env(env_vars) do
-        Simulator.launch(Xcode.build_dir("-iphonesimulator"), IOS_DYNAMIC_FRAMEWORK_SPECS_TARGET_NAME, "frameworks.ios.dynamic.specs.run.log")
+        Simulator.launch(Xcode.build_dir("-iphonesimulator"), IOS_DYNAMIC_FRAMEWORK_SPECS_TARGET_NAME, Xcode.build_dir("-frameworks.ios.dynamic.specs.run.log"))
       end
     end
   end