build: Bump clang minimum supported version to 19 #36036

1. 
   maflcko commented at 1:47 PM on August 20, 2026: member

   Most supported operating systems ship with clang-19 (or later), so bump the minimum to that and allow new code to drop workarounds for previous clang bugs.

   (For this bump, only C++20 CTAD will become available.)

   This patch will only be released in version 33.x, next year (2027).

   For reference:

   • https://packages.debian.org/bookworm/clang-22
   • https://packages.ubuntu.com/noble/clang-20
   • CentOS-like 8/9/10 ship clang-21 via Stream
   • Free/Open/Net*BSD ship clang-19
   • OpenSuse Tumbleweed ships with https://software.opensuse.org/package/clang (clang22); leap:latest with clang-19
   • macOS 14: ...💀

   On operating systems where the minimum Clang version is not shipped by default, the user would have to use GCC, or install Clang in a different way. For example:

   • https://packages.debian.org/bookworm/g++ (g++-12)
   • https://packages.ubuntu.com/jammy/g++-12
   • https://apt.llvm.org/, brew, nix, guix, or compile clang from source, ...
2. DrahtBot added the label Build system on Aug 20, 2026
3. 
   DrahtBot commented at 1:47 PM on August 20, 2026: contributor

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   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/36036.

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4. maflcko marked this as a draft on Aug 20, 2026
5. maflcko added this to the milestone 33.0 on Aug 20, 2026
6. maflcko force-pushed on Aug 20, 2026
7. build: Bump clang minimum supported version to 19 faa0298b25
8. DrahtBot added the label CI failed on Aug 20, 2026
9. clang-format: Use Standard: Latest

   It should mostly be irrelevant and generally be fine to format any C++
   code with the latest standard version. So set that here, but it can be
   changed in the future, if there is ever a reason.

   faafb7d739
10. maflcko force-pushed on Aug 20, 2026
11. maflcko removed the label CI failed on Aug 20, 2026
12. DrahtBot added the label CI failed on Aug 20, 2026
13. maflcko removed the label CI failed on Aug 20, 2026
14. ci: warp-ubuntu-2604-x64-8x f134342a94
15. DrahtBot added the label CI failed on Aug 20, 2026
16. maflcko removed the label CI failed on Aug 20, 2026
17. DrahtBot added the label CI failed on Aug 20, 2026

Milestone
33.0