…ter#140478)

This reverts commit acdbcad.

Reland #140478 with `ios_content_validation_test` test fix.
```
[ios_content_validation_test] Process terminated with exit code 0.
Task result:
{
  "success": true,
  "data": null,
  "detailFiles": [],
  "benchmarkScoreKeys": [],
  "reason": "success"
}

```

__________

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also #62902 and #85174 and #101963

Fixes #136060

Reland flutter#140478 with `ios_content_validation_test` test fix.
```
[ios_content_validation_test] Process terminated with exit code 0.
Task result:
{
  "success": true,
  "data": null,
  "detailFiles": [],
  "benchmarkScoreKeys": [],
  "reason": "success"
}

```

__________

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also flutter#62902 and flutter#85174 and flutter#101963

Fixes flutter#136060

…ter#140478)

Build the engine Flutter.framework against a minimum of iOS 12.
Part of flutter/flutter#140474

Flutter tooling already enforcing iOS 12 on app-end: flutter/flutter#140478

See also #574

…ter#140478)

…deps (#5804)

For iOS and macOS move fetch deps from explicity running `pub get` and `pod install` to instead run `flutter build x --config-only` which smartly fetches deps and lays down the required native pieces.  I didn't guard it on whether certain files are present since the command already has similar guards, and runs pretty fast if the native code has already been generated.

This fixes an issue where `pod install` is run before the Flutter native bits and migrations are run.

Fixes issues seen in the Flutter roll #5792 (comment)
```
Running command: "pod install" in /Volumes/Work/s/w/ir/x/w/packages/packages/camera/camera_avfoundation/example/ios
Analyzing dependencies
[!] CocoaPods could not find compatible versions for pod "Flutter":
  In Podfile:
    Flutter (from `Flutter`)

Specs satisfying the `Flutter (from `Flutter`)` dependency were found, but they required a higher minimum deployment target.

[!] Automatically assigning platform `iOS` with version `11.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.
Unable to "pod install"
```

Caused by flutter/flutter#140478

…ter#140478)

…deps (flutter#5804)

For iOS and macOS move fetch deps from explicity running `pub get` and `pod install` to instead run `flutter build x --config-only` which smartly fetches deps and lays down the required native pieces.  I didn't guard it on whether certain files are present since the command already has similar guards, and runs pretty fast if the native code has already been generated.

This fixes an issue where `pod install` is run before the Flutter native bits and migrations are run.

Fixes issues seen in the Flutter roll flutter#5792 (comment)
```
Running command: "pod install" in /Volumes/Work/s/w/ir/x/w/packages/packages/camera/camera_avfoundation/example/ios
Analyzing dependencies
[!] CocoaPods could not find compatible versions for pod "Flutter":
  In Podfile:
    Flutter (from `Flutter`)

Specs satisfying the `Flutter (from `Flutter`)` dependency were found, but they required a higher minimum deployment target.

[!] Automatically assigning platform `iOS` with version `11.0` on target `Runner` because no platform was specified. Please specify a platform for this target in your Podfile. See `https://guides.cocoapods.org/syntax/podfile.html#platform`.
Unable to "pod install"
```

Caused by flutter/flutter#140478

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
3. Compile with `-miphoneos-version-min=12.0`
4. Run the migrator on all example apps and integration tests.

See also:
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue:

1. Update ios_deployment_target from 12.0 to 13.0.
2. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
3. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'`
4. Compile with `-miphoneos-version-min=12.0`
5. Run the migrator on all example apps and integration tests.

See also (ios_deployment_target):
* flutter/buildroot#808
* flutter/buildroot#574

See also (template, migrator):
* flutter#62902
* flutter#85174
* flutter#101963
* flutter#140478

Issue: flutter#167735

This updates the Flutter minimum iOS version from 12.0 to 13.0, adds a
migrator for existing apps, and updates our own examples, tests, and
benchmark apps to 13.0. A follow-up patch will drop iOS 13 `@available`
checks in the embedder.

This is required in order to use Swift in the embedder and not need to
bundle the Swift runtime libs in every app that uses Flutter. Swift
stable ABI

As of March 2025, usage of iOS is well below 1%, see example public
usage data here:
https://telemetrydeck.com/survey/apple/iOS/majorSystemVersions/

This patch makes the following changes:
1. Updates ios_deployment_target from 12.0 to 13.0.
2. Changes templates to `IPHONEOS_DEPLOYMENT_TARGET`,
`MinimumOSVersion`, and Podfile `platform :ios` to 12.0.
3. Adds migrator for Podfile part to migrate `platform :ios, '11.0'` ->
`platform :ios, '12.0'`
4. Compiles with `-miphoneos-version-min=12.0`
5. Runs the migrator on all example apps and integration tests.
6. Updates examples, tests to iOS 13 deployment target

It also updates `verify_exported.dart`:
* iOS 13 introduces stricter separation of const and non-const global
symbols. Previously, these were declared in the Mach-O `__DATA` section
which may be mapped read-write, but now they're in a dedicated
`__DATA_CONST` section which is mapped read-only. This adds
`(__DATA_CONST,__const)` to the allowlist with the same enforcement on
exported symbol naming as before.

See also (ios_deployment_target):
* flutter/buildroot#808
* flutter/buildroot#574

See also (template, migrator):
* #62902
* #85174
* #101963
* #140478

Issue: #167735

## Pre-launch Checklist

- [X] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [X] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [X] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [X] I signed the [CLA].
- [X] I listed at least one issue that this PR fixes in the description
above.
- [X] I updated/added relevant documentation (doc comments with `///`).
- [X] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [X] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [X] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md