[Hermes] Can't build a new project for dev

[bartlomein]

Description

Was having issues with my build so I created a brand new one and tried to run it and getting the same error:

ld: building for 'visionOS-simulator', but linking in dylib (/Users/bart/dev/exampleapp/visionos/Pods/hermes-engine/destroot/Library/Frameworks/xros/hermes.framework/hermes) built for 'macOS'
clang: error: linker command failed with exit code 1 (use -v to see invocation)


** BUILD FAILED **```

### Steps to reproduce

Follow instructions to create a new app, and run it locally without any changes.

### React Native Version

0.73.3

### Affected Platforms

Other (please specify)

### Areas

Other (please specify)

### Output of `npx react-native info`

```text
none

Stacktrace or Logs

none

Reproducer

none

Screenshots and Videos

No response

[okwasniewski]

Hey, are you running latest version of cmake? Can you also try the latest version of react native visionOS (0.73.7)?

[bartlomein]

Hmm I updated both of those and ran into another issue

The following build commands failed:
	SwiftEmitModule normal x86_64 Emitting\ module\ for\ mmvisionpro (in target 'mmvisionpro' from project 'mmvisionpro')
(1 failure)

At one point it did build with no errors, just when a simulator was not selected, just a Generic Vision Pro device. I have a feeling I might have messed up some XCode setting.

[bartlomein]

Actually I think I got it!
Had to add hermes to Frameworks, libraries and Embedded content here:

[josh-deprogram]

I'm hitting the same problem...

CMake - 3.28.3
RN-VisionOS - 0.73.7
XCode - 15.3
VisionOS - 1.1

Adding libReact-hermes.a to Frameworks doesn't seem to resolve either

[josh-deprogram]

Aha! I have it compiling, disabled hermes from pods and removed the framework in Xcode..
For anyone else kicking the compiler try, and doesn't mind running without Hermes
:hermes_enabled => false,

[robertherber]

@josh-deprogram Thanks, also got it running by disabling Hermes for now 👍

[jariwalabhavesh]

@josh-deprogram Thanks, I had disable hermes in root ios and visionos podfile and it start working.
Thanks

[okwasniewski]

Can you guys try out RC release? https://github.com/callstack/react-native-visionos/releases/tag/v0.74.0-rc.0-visionos

[15bedirhan]

I tried out RC release version but still have same error. Any updates on this?

[okwasniewski]

@15bedirhan Do you have the latest version of cmake? (3.29.0 or 3.28.4)?

[15bedirhan]

@15bedirhan Do you have the latest version of cmake? (3.29.0 or 3.28.4)?

Yes my cmake version is 3.29.0.

For now I continue disabled hermes in visionos/podfile. It works after that

[okwasniewski]

Okay I did some investigation together with @thiagobrez, looks like it's Logging.cpp file from Hermes which causes those issues for some people. It must be some missing tool/library as its not happening on my Mac.

[thiagobrez]

Workaround for now:

• Double click the error line use of undeclared identifier 'vsnprintf' in the Logs tab
• Logging.cpp from Hermes will open
• Comment everything inside the function
• Rebuild the app

[okwasniewski]

The fix is coming: facebook/hermes#1358

[okwasniewski]

I'm disabling Hermes by default until the above PR gets merged. If you still want to use Hermes remove :hermes_enabled => false from visionos/Podfile. And do what @thiagobrez explained above. The fix should land shortly.

[matthargett]

upstream PR merged, so this can be revisited for the next release of react-native-visionos