Clash with Reanimated - CLANG_CXX_LANGUAGE_STANDARD has different values

[MydusApps]

When installing both RN Reanimated and RN Skia, upon pod install I come across the following error message:

"Can't merge user_target_xcconfig for pod targets: ["RNReanimated", "hermes-engine", "react-native-skia", "Api", "Jsi", "RNSkia", "SkiaHeaders", "Utils"]. Singular build setting CLANG_CXX_LANGUAGE_STANDARD has different values"

This has happened across all versions of React from 0.65 to 0.68, as well as earlier versions of RN Reanimated.

Thanks in advance.

Kind regards,
Mani

[leechanghoon3024]

same issue

[chrfalch]

@schiller-manuel Should we remove our CLANG-version to avoid this, or is there another solution to fix this?

[schiller-manuel]

reanimated explicitly specifies c++14:

https://github.com/software-mansion/react-native-reanimated/blob/main/RNReanimated.podspec#L82

so this collides with our c++17.

So for now, removing CLANG_CXX_LANGUAGE_STANDARD from react-native-skia solves this issue, I guess ideally all RN libs settle for c++17 when RN 0.68 is supported.

[chrfalch]

Will this affect in any way compilation of react-native-skia, or should we just do this to make sure we don't collide with Reanimated?

[schiller-manuel]

We might get some warnings when trying to use C++17 features. Reanimated could also raise its c++ version, a PR there might be worth a try.

[schiller-manuel]

I tried to reproduce this issue but it builds fine for me:

npx react-native init SkiaReanimated
cd SkiaReanimated
yarn add react-native-reanimated
yarn add @shopify/react-native-skia
npx pod-install
yarn ios

"dependencies": {
    "@shopify/react-native-skia": "^0.1.121",
    "react": "17.0.2",
    "react-native": "0.68.1",
    "react-native-reanimated": "^2.7.0"
  },

Can you help me reproduce this issue please? Which combination of the dependencies cause it for you?

[kyonru-nomad]

How did you guys solve this?

[schiller-manuel]

I could not reproduce this issue. If you have hints on how to reproduce, please let me know.

[FrancoTanzarellaEviivo]

I'm experiencing this with the below dependencies. We will be updating packages later this week so will update if that changes anything.

dependencies: {
"@shopify/react-native-skia": "^0.1.122",
"react": "17.0.2",
"react-native": "0.66.3",
"react-native-reanimated": "2.8.0",
}

[kyonru-nomad]

I'm experiencing this with the below dependencies.

dependencies: {
"@shopify/react-native-skia": "^0.1.119",
"react": "17.0.2",
"rn-skia-sketch-canvas": "^0.3.1",
"react-native": "0.68.0",
"react-native-reanimated": "2.6.0",
}

[billnbell]

How did you guys solve this?

yarn add [email protected]

Then patch it

software-mansion/react-native-reanimated#3326

[kockok]

I am using [email protected] and [email protected]

but still having multiple warnings:

[!] Can't merge user_target_xcconfig for pod targets: ["RNReanimated", "hermes-engine"]. Singular build setting CLANG_CXX_LANGUAGE_STANDARD has different values.

[!] Can't merge user_target_xcconfig for pod targets: ["RNReanimated", "hermes-engine"]. Singular build setting CLANG_CXX_LANGUAGE_STANDARD has different values.

[!] Can't merge user_target_xcconfig for pod targets: ["RNReanimated", "hermes-engine"]. Singular build setting CLANG_CXX_LANGUAGE_STANDARD has different values.

[!] Can't merge user_target_xcconfig for pod targets: ["RNReanimated", "hermes-engine"]. Singular build setting CLANG_CXX_LANGUAGE_STANDARD has different values.

Is this really solved?

[chrfalch]

Hi @kockok, this doesn't seem related to react-native-skia, which should have been in the list of targets (related to ["RNReanimated", "hermes-engine"]). We changed this to use a per-pod based configuration a while ago.

[billnbell]

Just set the CXX n the podspec.

node_modules/react-native-reanimated/RNReanimated.podspec

Change to:

"CLANG_CXX_LANGUAGE_STANDARD" => "c++17",

[ken0nek]

It seems RNReanimated uses c++17 now.

https://github.com/software-mansion/react-native-reanimated/blob/main/RNReanimated.podspec#L105

[billnbell]

This is not true. in 2.10.0 it is still c++14

https://github.com/software-mansion/react-native-reanimated/blob/2.10.0/RNReanimated.podspec#L97

[dankocher]

react-native-reanimated version 3 uses c++17

just run yarn add react-native-reanimated@last and select version 3.0.0-rc.2

[billnbell]

That is a rc.2 and not released properly yet.

[coawazie]

react-native-reanimated version 3 uses c++17

just run yarn add react-native-reanimated@last and select version 3.0.0-rc.2

It worked. Thanks @dankocher