Messages in this thread | | | Date | Mon, 7 Aug 2023 17:06:17 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 1/3] compiler_types: Introduce the Clang __preserve_most function attribute |
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On Mon, Aug 07, 2023 at 02:36:53PM +0200, Florian Weimer wrote:
> I think the GCC vs Clang thing is expected to work today, isn't it? > Using the Clang-based BPF tools with a GCC-compiled kernel requires a > matching ABI.
Nope, all bets are off. There is no module ABI, in the widest possible sense.
There's all sorts of subtle breakage, I don't remember the exact details, but IIRC building the kernel with a compiler that has asm-goto-output and modules with a compiler that doesn't have it gets you fireworks.
We absolutely do even bother tracking any of this.
There's also things like GCC plugins, they can randomly (literally in the case of struct randomization) change things around that isn't compatible with what the other compiler does -- or perhaps even a later version of the same compiler.
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