fc5688375c
-fstrict-flex-arrays means that the compiler doesn't have to assume that any trailing array is a flex array. I.e. unless the array is declared without a specified size, only indices in the declared range are valid. -Warray-bounds turns on the warnings about out-of-bounds array accesses. -Warray-bounds=2 does some more warnings, with higher false positive rate. But it doesn't seem to yield any false positives in our codebase, so enable it. clang supports -Warray-bounds, but not -Warray-bounds=2. gcc supports both. gcc-13 supports -fstrict-flex-arrays. See https://people.kernel.org/kees/bounded-flexible-arrays-in-c for a long discussion of use in the kernel.
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