Xcode 11.0 build get error - Unknown argument type '__attribute__' in method -[RCTAppState getCurrentAppState:error:]

Question

On every build in Xcode i get this error. How can i fix it?

I found this commit https://github.com/facebook/react-native/pull/25146/commits/61b8b9e69d8609fecaaaa7d2c9e32808bc5e98cb which should fix it but nothing happened.

static BOOL RCTParseUnused(const char **input)
{
 return RCTReadString(input, "__unused") ||
     RCTReadString(input, "__attribute__((__unused__))") ||
     RCTReadString(input, "__attribute__((unused))");
}

I have still this error

Can you help me fix it please?

---

I looked in node_modules and i already have this line

static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__unused") ||
         RCTReadString(input, "__attribute__((__unused__))") ||
         RCTReadString(input, "__attribute__((unused))");
}

Do you have another advice please?

Answer 1

The solution is to either Upgrade to RN 59.9 or higher OR to apply this patch manually:

1. go to node_modules/react-native/React/Base/RCTModuleMethod.mm
2. Add the line from the patch.

Answer 2

Solution for this issue: go to node_modules/react-native/React/Base/RCTModuleMethod.mm and update below code

static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__attribute__((unused))") ||
           RCTReadString(input, "__attribute__((__unused__))") ||
           RCTReadString(input, "__unused");
}