Sweep out some extra warnings

Swept:
`-Wpadded` in some places (where it caused extra size, instead of just
saying "hey, we padded struct at the end to align, just as standard says")
`-Wweak-vtables` everywhere (Clang)
`-Wexit-time-destructors` everywhere (Clang)
`-Wmissing-noreturn` everywhere (Clang)

The last three are enabled for Clang compilation going forward.

Also enabled `-Wunreachable-code` for Clang and GCC

1 files changed, 6 insertions, 0 deletions

diff --git a/include/internal/catch_interfaces_testcase.cpp b/include/internal/catch_interfaces_testcase.cpp
new file mode 100644
index 00000000..35c3db08
--- /dev/null
+++ b/include/internal/catch_interfaces_testcase.cpp
@@ -0,0 +1,6 @@
+#include "internal/catch_interfaces_testcase.h"
+
+namespace Catch {
+    ITestInvoker::~ITestInvoker() = default;
+    ITestCaseRegistry::~ITestCaseRegistry() = default;
+}