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It seems that Clang thinks __builtin_constant_p() of undefined variables should return true[1]. This is being fixed separately[2], but in the meantime, expand the fortify tests to help track this kind of thing down faster in the future. Link: https://github.com/ClangBuiltLinux/linux/issues/2073 [1] Link: https://github.com/llvm/llvm-project/pull/130713 [2] Link: https://lore.kernel.org/r/20250312000349.work.786-kees@kernel.org Signed-off-by: Kees Cook <kees@kernel.org>