build: Bump Xcode CLT minimum supported version to 26.3 #36287

1. 
   maflcko commented at 1:00 PM on September 17, 2026: member

   Now that macOS 14 is EOL (https://en.wikipedia.org/wiki/MacOS_Sonoma), it seems odd to still support native Xcode CLT builds on it.

   (macOS Sonoma 14.8.9 received its final security update on 06 Aug 2026: https://support.apple.com/en-us/100100)

   This patch will only be released in version 33.x, another 6 months out from now. Also, depends builds (and thus release builds) are unaffected. Affected devs or users are free to build via brew, nix, etc...

   This is mostly needed to get an equivalent of llvm-19-ish via CLT, see https://en.wikipedia.org/wiki/Xcode#Toolchain_versions. Specifically, it will allow to use C++20 CTAD and also allow switching the project to C++23.

2. DrahtBot added the label Build system on Sep 17, 2026
3. maflcko marked this as a draft on Sep 17, 2026
4. 
   DrahtBot commented at 1:00 PM on September 17, 2026: contributor

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   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/36287.

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5. build: Bump Xcode CLT minimum supported version to 26.3 fa0df9d336
6. maflcko force-pushed on Sep 17, 2026
7. maflcko added this to the milestone 33.0 on Sep 17, 2026
8. DrahtBot added the label CI failed on Sep 17, 2026
9. maflcko marked this as ready for review on Sep 17, 2026
10. DrahtBot removed the label CI failed on Sep 17, 2026
11. 
    fanquake commented at 4:16 PM on September 19, 2026: member

    Concept ACK

Milestone
33.0