Upgrade to libfmt 12#30171

Merged

StephanDollberg merged 14 commits into

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stephan/remove-fmt-deprecated-ostream

Apr 17, 2026

Commits on Apr 14, 2026

base/format_to: add HasFormatToFreeFunction concept and auto-generated operator<<
StephanDollberg
committed

Commits on Apr 17, 2026

model: migrate all types from operator<< to format_to
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raft: migrate all types from operator<< to format_to
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storage: migrate types from operator<< to format_to
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config: migrate all types from operator<< to format_to
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kafka/protocol: update generator to emit format_to instead of operator<<
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kafka: migrate types from operator<< to format_to
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security: migrate types from operator<< to format_to
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misc: migrate remaining subsystems from operator<< to format_to
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cluster: migrate types from operator<< to format_to
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misc: add formatters for third-party types
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misc: fix remaining call sites and stale includes
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base/format_to: add fmt_streamed() compile-time guard
StephanDollberg
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build: upgrade fmt 9.1.0 to 12.1.0, remove FMT_DEPRECATED_OSTREAM
StephanDollberg
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