Bump fmt to 12.1.0 to fix xcode 26.4 by leotm · Pull Request #56099 · react/react-native

leotm · 2026-03-14T20:23:58Z

Summary:

Follow-up to

TODO

bump packages/react-native/third-party-podspecs/fmt.podspec
bump scripts/releases/ios-prebuild/configuration.js
packages/react-native/third-party-podspecs/RCT-Folly.podspec
packages/react-native/gradle/libs.versions.toml
packages/rn-tester/Podfile.lock
- rn-rester (main) ios not building on Xcode 26.3, CI currently only supports Xcode 16
- i cannot downgrade macos26.4b4 locally to macos15 to install Xcode16.4 and bump pods this way
- so on Xcode 26.3 i've attempted to bump only fmt minimally, ignoring remaining RN 0.86 hashes

Ref: https://github.com/search?q=repo%3Afacebook%2Freact-native+%2211.0.2%22&type=code

however unable to test rn-tester, ios doesn't seem to build on Xcode 26.3 let alone 26.4b
not tested previous versions of Xcode
not tested prior branches/tags to main

rn-tester CI is passing on old macos-15 Xcode 16.4.0 only, ideally this should be extended to stable macos lts and Xcode 26.3 stable first

separate follow-ups to this minimal fmt bump

bump CI macos-15 xcode 16.1-4 to macos-26 xcode 26.0-3
bump rn-tester Podfile.lock from RN 0.82 to 0.86 main (aka nightly)
bump folly to 2025.11.03.00
bump folly to 2026.03.09.00

Resolve: #55601

Changelog:

[General][Changed] Bump fmt to 12.1.0 to fix Xcode 26.4

Test Plan:

RNTester

Brett-Best · 2026-03-18T22:43:46Z

Thanks @leotm, now that the RC is out it would be great to get this merged in so testing can commence :)

I think upgrading Folly to latest would be a good idea as well but perhaps it can be done in a separate PR?

Follow-up to - #47033 - #50431Resolve: #55601

meta-codesync · 2026-03-19T20:35:33Z

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this in D97358194.

meta-codesync · 2026-03-19T23:58:48Z

@cipolleschi merged this pull request in faeef2b.

react-native-bot · 2026-03-19T23:58:48Z

This pull request was successfully merged by @leotm in faeef2b

^{When will my fix make it into a release? | How to file a pick request?}

Summary: Follow-up to - #47033 - #50431 TODO - [x] bump packages/react-native/third-party-podspecs/fmt.podspec - [x] bump scripts/releases/ios-prebuild/configuration.js - [x] packages/react-native/third-party-podspecs/RCT-Folly.podspec - [x] packages/react-native/gradle/libs.versions.toml - [x] packages/rn-tester/Podfile.lock - rn-rester (main) ios not building on Xcode 26.3, CI currently only supports Xcode 16 - i cannot downgrade macos26.4b4 locally to macos15 to install Xcode16.4 and bump pods this way - so on Xcode 26.3 i've attempted to bump only fmt minimally, ignoring remaining RN 0.86 hashes Ref: https://github.com/search?q=repo%3Afacebook%2Freact-native+%2211.0.2%22&type=code however unable to test rn-tester, ios doesn't seem to build on Xcode 26.3 let alone 26.4b not tested previous versions of Xcode not tested prior branches/tags to main rn-tester CI is passing on old macos-15 Xcode 16.4.0 only, ideally this should be extended to stable macos lts and Xcode 26.3 stable first separate follow-ups to this minimal fmt bump - bump CI macos-15 xcode 16.1-4 to macos-26 xcode 26.0-3 - bump rn-tester Podfile.lock from RN 0.82 to 0.86 main (aka nightly) - bump folly to 2025.11.03.00 - bump folly to 2026.03.09.00 Resolve: #55601 [General][Changed] Bump fmt to 12.1.0 to fix Xcode 26.4 Pull Request resolved: #56099 Test Plan: RNTester Reviewed By: alanleedev Differential Revision: D97358194 Pulled By: cipolleschi fbshipit-source-id: 3eb578a99a310e3eb77433692bf35502d0d78d24

react-native-bot · 2026-03-20T18:02:01Z

This pull request was successfully merged by @leotm in 506943c

^{When will my fix make it into a release? | How to file a pick request?}

Summary: Follow-up to - #47033 - #50431 TODO - [x] bump packages/react-native/third-party-podspecs/fmt.podspec - [x] bump scripts/releases/ios-prebuild/configuration.js - [x] packages/react-native/third-party-podspecs/RCT-Folly.podspec - [x] packages/react-native/gradle/libs.versions.toml - [x] packages/rn-tester/Podfile.lock - rn-rester (main) ios not building on Xcode 26.3, CI currently only supports Xcode 16 - i cannot downgrade macos26.4b4 locally to macos15 to install Xcode16.4 and bump pods this way - so on Xcode 26.3 i've attempted to bump only fmt minimally, ignoring remaining RN 0.86 hashes Ref: https://github.com/search?q=repo%3Afacebook%2Freact-native+%2211.0.2%22&type=code however unable to test rn-tester, ios doesn't seem to build on Xcode 26.3 let alone 26.4b not tested previous versions of Xcode not tested prior branches/tags to main rn-tester CI is passing on old macos-15 Xcode 16.4.0 only, ideally this should be extended to stable macos lts and Xcode 26.3 stable first separate follow-ups to this minimal fmt bump - bump CI macos-15 xcode 16.1-4 to macos-26 xcode 26.0-3 - bump rn-tester Podfile.lock from RN 0.82 to 0.86 main (aka nightly) - bump folly to 2025.11.03.00 - bump folly to 2026.03.09.00 Resolve: #55601 [General][Changed] Bump fmt to 12.1.0 to fix Xcode 26.4 Pull Request resolved: #56099 Test Plan: RNTester Reviewed By: alanleedev Differential Revision: D97358194 Pulled By: cipolleschi fbshipit-source-id: 3eb578a99a310e3eb77433692bf35502d0d78d24

react-native-bot · 2026-04-10T14:24:51Z

This pull request was successfully merged by @leotm in 3dd61db

^{When will my fix make it into a release? | How to file a pick request?}

The earlier fmt podspec bump alone wasn't enough — `RCT-Folly.podspec` pins `fmt` to an exact version (`spec.dependency "fmt", "11.0.2"`), so leaving it at 11.0.2 made CocoaPods unable to resolve a compatible `fmt`. Bumps that pin to 12.1.0 too (matching react/react-native#56099), and regenerates the macOS `Podfile.lock` so the committed lock matches what `pod install` produces.

## Summary Cherry-pick of react@faeef2b (react#56099). fmt 11.0.2 enables `consteval` on Apple clang ≥ 14 (which includes Xcode 26.4), but Xcode 26.4's stricter clang rejects consteval expressions in fmt's format-inl.h. fmt 12.1.0 fixes this. Changes: - `packages/react-native/third-party-podspecs/fmt.podspec`: 11.0.2 → 12.1.0 - `packages/react-native/third-party-podspecs/RCT-Folly.podspec": fmt dep 11.0.2 → 12.1.0 - `packages/react-native/gradle/libs.versions.toml`: 11.0.2 → 12.1.0 - `packages/rn-tester/Podfile.lock`: updated fmt version + checksum - `scripts/releases/ios-prebuild/configuration.js`: 11.0.2 → 12.1.0 ## Test Plan RNTester macOS builds successfully on Xcode 26.4. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Cherry-pick of react@faeef2b (react#56099). fmt 11.0.2 enables `consteval` on Apple clang ≥ 14 (which includes Xcode 26.4), but Xcode 26.4's stricter clang rejects consteval expressions in fmt's format-inl.h. fmt 12.1.0 fixes this. Changes: - `packages/react-native/third-party-podspecs/fmt.podspec`: 11.0.2 → 12.1.0 - `packages/react-native/third-party-podspecs/RCT-Folly.podspec": fmt dep 11.0.2 → 12.1.0 - `packages/react-native/gradle/libs.versions.toml`: 11.0.2 → 12.1.0 - `packages/rn-tester/Podfile.lock`: updated fmt version + checksum - `scripts/releases/ios-prebuild/configuration.js`: 11.0.2 → 12.1.0 RNTester macOS builds successfully on Xcode 26.4. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

meta-claBot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Mar 14, 2026

leotm force-pushed the patch-7 branch from b0a17c1 to bfa2a47Compare March 14, 2026 20:31

leotm changed the title ~~Update fmt library version to 12.1.0~~Bump fmt to 12.1.0Mar 14, 2026

leotm changed the title ~~Bump fmt to 12.1.0~~Bump fmt to 12.1.0 to fix xcode 26.4Mar 14, 2026

leotm force-pushed the patch-7 branch from bfa2a47 to 854b9dbCompare March 19, 2026 17:22

Bump fmt to 12.1.0 to fix Xcode 26.4
4b39a9e
Follow-up to - #47033 - #50431Resolve: #55601

leotm force-pushed the patch-7 branch from 854b9db to 4b39a9eCompare March 19, 2026 18:50

leotm marked this pull request as ready for review March 19, 2026 18:51

facebook-github-toolsBot added the Shared with Meta Applied via automation to indicate that an Issue or Pull Request has been shared with the team. label Mar 19, 2026

meta-codesyncBot closed this in faeef2bMar 19, 2026

facebook-github-toolsBot added the Merged This PR has been merged. label Mar 19, 2026

chrfalch mentioned this pull request Mar 25, 2026
[0.83] Fix XCode 26.4 build errors reactwg/react-native-releases#1259
Closed

simarmol mentioned this pull request Mar 25, 2026
[0.81] Fix XCode 26.4 build errors reactwg/react-native-releases#1261
Closed

HSRAKTU mentioned this pull request Mar 26, 2026
Backport: Bump fmt to 12.1.0 to fix Xcode 26.4 compilation #56225
Open

SamuelBrucksch mentioned this pull request Mar 26, 2026
Does not build on xcode 26.4 for iOS Shopify/react-native-skia#3782
Closed
1 task

This was referenced Mar 27, 2026
[0.82] Fix XCode 26.4 build errors reactwg/react-native-releases#1262
Closed
[0.84] Fix XCode 26.4 build errors reactwg/react-native-releases#1263
Open

russellwheatley mentioned this pull request Mar 31, 2026
ci(macos): fix macos test runner invertase/react-native-firebase#8947
Merged
9 tasks

g4rb4g3 mentioned this pull request Apr 8, 2026
fix: xcode 26.4 builds fail Iternio-Planning-AB/react-native-auto-play#66
Merged

tsapeta mentioned this pull request Jun 4, 2026
[ci][macos] Bump macOS workflow to Xcode 26.4.1 and fmt to 12.1.0 expo/expo#46581
Merged

This was referenced Jun 16, 2026
RNCLI incompatible with Xcode 27 leotm/react-native-template-new-architecture#1994
Closed
React Native incompatible with Xcode 26 leotm/react-native-template-new-architecture#1995
Closed

This was referenced Jun 25, 2026
chore: bump fmt to 12.1.0 to fix Xcode 26.4 microsoft/react-native-macos#2996
Merged
chore(0.81): bump fmt to 12.1.0 to fix Xcode 26.4 microsoft/react-native-macos#2997
Merged

Navigation Menu

Uh oh!

Bump fmt to 12.1.0 to fix xcode 26.4 - #56099

Bump fmt to 12.1.0 to fix xcode 26.4#56099
leotm wants to merge 1 commit into
react:mainfrom
leotm:patch-7

leotm commented Mar 14, 2026•
edited
Loading

Uh oh!

Brett-Best commented Mar 18, 2026•
edited
Loading

Uh oh!

meta-codesyncBot commented Mar 19, 2026

Uh oh!

meta-codesyncBot commented Mar 19, 2026

Uh oh!

react-native-bot commented Mar 19, 2026

Uh oh!

react-native-bot commented Mar 20, 2026

Uh oh!

react-native-bot commented Apr 10, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

Uh oh!

Conversation

leotm commented Mar 14, 2026• edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Summary:

Changelog:

Test Plan:

Uh oh!

Brett-Best commented Mar 18, 2026• edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

meta-codesyncBot commented Mar 19, 2026

Uh oh!

meta-codesyncBot commented Mar 19, 2026

Uh oh!

react-native-bot commented Mar 19, 2026

Uh oh!

react-native-bot commented Mar 20, 2026

Uh oh!

react-native-bot commented Apr 10, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

3 participants

leotm commented Mar 14, 2026•
edited
Loading

Brett-Best commented Mar 18, 2026•
edited
Loading