build: Investigate aarch64 pointer authentication #19075

1. 
   dongcarl commented at 9:22 pm on May 26, 2020: contributor

   This would entail adding -mbranch-protection=standard to our hardening flags. We should also check if this feature requires kernel/glibc support that our ABI doesn’t include.

   More info: https://fedoraproject.org/wiki/Changes/Aarch64_PointerAuthentication

2. dongcarl added the label Build system on May 26, 2020
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14. 
    willcl-ark commented at 10:48 am on February 9, 2026: member

    Has this been completed as part of https://github.com/bitcoin/bitcoin/pull/32071/changes/00ba3ba30341a9073049125334f176d6c05d1b54 ?

    ISTM that that change resulted in our current aarch64/arm64 cmake configuration:

    https://github.com/bitcoin/bitcoin/blob/6d625af2831b7c36d59f245a65df3f70f2110f69/CMakeLists.txt#L532-L538

    …where we use bti on Darwin and standard on all other aarch64/arm64 systems.

15. 
    fanquake commented at 10:50 am on February 9, 2026: member

    Has this been completed as part of https://github.com/bitcoin/bitcoin/commit/00ba3ba30341a9073049125334f176d6c05d1b54 ?

    No, but I do have a branch that does complete this, which I’ll open this week.

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dongcarl willcl-ark fanquake

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