depends: drop `ltcg` for Windows Qt #32496

1. 
   fanquake commented at 11:45 AM on May 14, 2025: member

   The related Windows patches were dropped in 5e794e62024eef612e1fbb71c76ea54d17435c14, and "Cross-compiling does not support LTO." (from #30997).

2. 
   DrahtBot commented at 11:45 AM on May 14, 2025: contributor

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   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32496.

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3. DrahtBot added the label Build system on May 14, 2025
4. fanquake requested review from hebasto on Jun 3, 2025
5. depends: remove support for Windows Qt LTO builds

   The patches needed to support this were dropped in
   5e794e62024eef612e1fbb71c76ea54d17435c14 and "Cross-compiling does not
   support LTO." (from #30997), so remove it for now.

   9653ebc053
6. fanquake renamed this:
   depends: add Qt `-ltcg` for Darwin, drop it for Windows
   depends: drop `ltcg` for Windows Qt
   on Jun 4, 2025
7. fanquake force-pushed on Jun 4, 2025
8. 
   fanquake commented at 1:56 PM on June 4, 2025: member

   Qt + lto works for native, but is broken for Darwin cross builds, so dropped the second commit.

9. 
   maflcko commented at 2:56 PM on June 4, 2025: member

   lgtm ACK 9653ebc053602a30aee6d8676913306d615841cf

10. fanquake merged this on Jun 5, 2025
11. fanquake closed this on Jun 5, 2025

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12. fanquake deleted the branch on Jun 5, 2025
13. sedited referenced this in commit f236a50dc1 on Jun 14, 2025
14. yuvicc referenced this in commit 069643f094 on Jul 6, 2025
15. yuvicc referenced this in commit 22f55cf11d on Aug 26, 2025
16. bug-castercv502 referenced this in commit cfdba67027 on Sep 28, 2025
17. stickies-v referenced this in commit a19c56cd7c on Nov 4, 2025
18. luke-jr referenced this in commit e00d724242 on Feb 5, 2026
19. kwsantiago referenced this in commit cb1e8fedaa on Feb 16, 2026
20. Kino1994 referenced this in commit cc52141c85 on Jun 28, 2026
21. BigcoinBGC referenced this in commit f1f7281dc3 on Jun 30, 2026
22. bitcoin locked this on Jul 30, 2026

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