Builds almost completely cleanly with -WEverything in LLVM

include/internal/catch_impl.hpp

@@ -8,6 +8,11 @@
 
 // Collect all the implementation files together here
 // These are the equivalent of what would usually be cpp files
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wweak-vtables"
+
+#include "catch_runner.hpp"
 #include "catch_registry_hub.hpp"
 #include "catch_notimplemented_exception.hpp"
 #include "catch_context_impl.hpp"
@@ -15,3 +20,35 @@
 #include "catch_generators_impl.hpp"
 #include "catch_resultinfo.hpp"
 #include "catch_resultinfo_builder.hpp"
+
+namespace Catch {
+    NonCopyable::~NonCopyable() {}
+    IShared::~IShared() {}
+    StreamBufBase::~StreamBufBase() {}
+    IContext::~IContext() {}
+    IResultCapture::~IResultCapture() {}
+    ITestCase::~ITestCase() {}
+    ITestCaseRegistry::~ITestCaseRegistry() {}
+    IRegistryHub::~IRegistryHub() {}
+    IMutableRegistryHub::~IMutableRegistryHub() {}
+    IExceptionTranslator::~IExceptionTranslator() {}
+    IExceptionTranslatorRegistry::~IExceptionTranslatorRegistry() {}
+    IReporter::~IReporter() {}
+    IReporterFactory::~IReporterFactory() {}
+    IReporterRegistry::~IReporterRegistry() {}
+    BasicReporter::~BasicReporter() {}
+    IRunner::~IRunner() {}
+    IMutableContext::~IMutableContext() {}
+    IConfig::~IConfig() {}
+    XmlReporter::~XmlReporter() {}
+    JunitReporter::~JunitReporter() {}
+    TestRegistry::~TestRegistry() {}
+    FreeFunctionTestCase::~FreeFunctionTestCase() {}
+    IGeneratorInfo::~IGeneratorInfo() {}
+    IGeneratorsForTest::~IGeneratorsForTest() {}
+
+    void Config::dummy() {}
+
+}
+
+#pragma clang diagnostic pop