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The flag will automatically initialize all variables to a pattern based on it's type. The goal being here is to eradicate an entire bug class of issues that can originate from uninitialized stack memory. Some examples include: - Kernel information disclosure, where uninitialized struct members or struct padding is copied back to usermode, leaking kernel information such as stack or heap addresses, or secret data like stack cookies. - Control flow based on uninitialized memory can cause a variety of issues at runtime, including stack corruptions like buffer overflows, heap corruptions due to deleting stray pointers. Even basic logic bugs can result from control flow operating on uninitialized data. As of GCC 12 this flag is now supported. https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=a25e0b5e6ac8a77a71c229e0a7b744603365b0e9 Clang has already supported it for a few releases. https://reviews.llvm.org/D54604