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Allow ReactCommon/Folly to be used in Swift libraries (DEFINES_MODULE) (#31858) #43327

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Summary:

Summary

Swift Pods require the use of modular headers to be statically linked. To interop with Objective-C modules, you need to make the Objective-C module "define a Module", that is modular header export.

This is already the case for a few podspecs so they can be consumed in Swift libraries, but ReactCommon and RCT-Folly don't do this yet and therefore this breaks in a few libraries of mine, for example see this issue: mrousavy/react-native-vision-camera#195.

If I were to include ReactCommon or RCT-Folly in my Swift library's podspec, the following error arises:

[!] The following Swift pods cannot yet be integrated as static libraries:

The Swift pod `VisionCamera` depends upon `RCT-Folly`, which does not define modules.
To opt into those targets generating module maps (which is necessary to import them from Swift
when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or
specify `:modular_headers => true` for particular dependencies.

So this PR fixes this issue by allowing Swift libraries to consume the ReactCommon and RCT-Folly podspecs since they now export modular headers.

Changelog

[General] [Fixed] - Expose Modular Headers for ReactCommon podspec
[General] [Fixed] - Expose Modular Headers for RCT-Folly podspec

Test Plan: * Add s.dependency "ReactCommon" or RCT-Folly to a Swift pod and see what happens. (See mrousavy/react-native-vision-camera#273)

Differential Revision: D54539127

Pulled By: cipolleschi

facebook#31858)

Summary:
<!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. -->

## Summary

Swift Pods require the use of [modular headers](https://blog.cocoapods.org/CocoaPods-1.5.0/) to be statically linked. To interop with Objective-C modules, you need to make the Objective-C module "define a Module", that is modular header export.

This is already the case for a few podspecs so they can be consumed in Swift libraries, but `ReactCommon` and `RCT-Folly` don't do this yet and therefore this breaks in a few libraries of mine, for example see this issue: mrousavy/react-native-vision-camera#195.

If I were to include `ReactCommon` or `RCT-Folly` in my Swift library's podspec, the following error arises:

```
[!] The following Swift pods cannot yet be integrated as static libraries:

The Swift pod `VisionCamera` depends upon `RCT-Folly`, which does not define modules.
To opt into those targets generating module maps (which is necessary to import them from Swift
when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or
specify `:modular_headers => true` for particular dependencies.
```

So this PR fixes this issue by allowing Swift libraries to consume the `ReactCommon` and `RCT-Folly` podspecs since they now export modular headers.

## Changelog

<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
-->

[General] [Fixed] - Expose Modular Headers for `ReactCommon` podspec
[General] [Fixed] - Expose Modular Headers for `RCT-Folly` podspec

Pull Request resolved: facebook#31858

Test Plan: * Add s.dependency "ReactCommon" or RCT-Folly to a Swift pod and see what happens. (See mrousavy/react-native-vision-camera#273)

Differential Revision: D54539127

Pulled By: cipolleschi
@facebook-github-bot facebook-github-bot added CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. p: Facebook Partner: Facebook Partner labels Mar 5, 2024
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This pull request was exported from Phabricator. Differential Revision: D54539127

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@cipolleschi merged this pull request in 8769245.

@Saadnajmi
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Awesome!

cipolleschi pushed a commit that referenced this pull request May 1, 2024
#43327)

Summary:
Pull Request resolved: #43327

<!-- Thanks for submitting a pull request! We appreciate you spending the time to work on these changes. Please provide enough information so that others can review your pull request. The three fields below are mandatory. -->

## Summary

Swift Pods require the use of [modular headers](https://blog.cocoapods.org/CocoaPods-1.5.0/) to be statically linked. To interop with Objective-C modules, you need to make the Objective-C module "define a Module", that is modular header export.

This is already the case for a few podspecs so they can be consumed in Swift libraries, but `ReactCommon` and `RCT-Folly` don't do this yet and therefore this breaks in a few libraries of mine, for example see this issue: mrousavy/react-native-vision-camera#195.

If I were to include `ReactCommon` or `RCT-Folly` in my Swift library's podspec, the following error arises:

```
[!] The following Swift pods cannot yet be integrated as static libraries:

The Swift pod `VisionCamera` depends upon `RCT-Folly`, which does not define modules.
To opt into those targets generating module maps (which is necessary to import them from Swift
when building as static libraries), you may set `use_modular_headers!` globally in your Podfile, or
specify `:modular_headers => true` for particular dependencies.
```

So this PR fixes this issue by allowing Swift libraries to consume the `ReactCommon` and `RCT-Folly` podspecs since they now export modular headers.

## Changelog

<!-- Help reviewers and the release process by writing your own changelog entry. For an example, see:
https://github.com/facebook/react-native/wiki/Changelog
-->

[General] [Fixed] - Expose Modular Headers for `ReactCommon` podspec
[General] [Fixed] - Expose Modular Headers for `RCT-Folly` podspec

Pull Request resolved: #31858

Test Plan: * Add s.dependency "ReactCommon" or RCT-Folly to a Swift pod and see what happens. (See mrousavy/react-native-vision-camera#273)

Reviewed By: dmytrorykun

Differential Revision: D54539127

Pulled By: cipolleschi

fbshipit-source-id: 2291cc0c8d6675521b220b02ef0c3c6a3e73be38
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