[Bug] Fix: iOS build fails on React Native 0.81+ due to C++ standard mismatch

[Mr-KID-github]

Hello cactus-react-native maintainers,

First off, thank you for your work on this great project!

The Problem

After upgrading my React Native project to a recent version (e.g., 0.81.x or higher), I encountered an iOS build failure.

The key error message occurs when compiling Cactus.mm, which includes headers from React Native's core:

.../ios/Pods/Headers/Public/ReactCommon/react/bridging/Base.h:65:3: error: unknown type name 'requires'

Root Cause

After investigating, the root cause is that recent versions of React Native's core headers (specifically react/bridging/Base.h) now use C++20 language features, such as therequires keyword.

However, the cactus-react-native.podspec file explicitly forces the C++ standard to c++17, which causes the compiler to fail when it encounters the new syntax.

The problematic line is in cactus-react-native.podspec:

s.pod_target_xcconfig = {
  ...
  "OTHER_CPLUSPLUSFLAGS" => base_optimizer_flags + " -std=c++17"
}

The Solution

The solution is to update the C++ standard in the .podspec file from c++17 to c++20. This small change makes the library compatible with the latest versions of React Native.

The specific change is as follows:

- "OTHER_CPLUSPLUSFLAGS" => base_optimizer_flags + " -std=c++17"
+ "OTHER_CPLUSPLUSFLAGS" => base_optimizer_flags + " -std=c++20"

Environment

• React Native Version: 0.81.1 (and higher)
• cactus-react-native Version: 0.2.10
• Platform: iOS
• Xcode Version: 15.x

Hope this feedback helps improve the project.

Thanks again for all your hard work!

Here is the diff that solved my problem:

diff --git a/node_modules/cactus-react-native/android/.project b/node_modules/cactus-react-native/android/.project
new file mode 100644
index 0000000..2c34a94
--- /dev/null
+++ b/node_modules/cactus-react-native/android/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>cactus-react-native</name>
+	<comment>Project cactus-react-native created by Buildship.</comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
+	</natures>
+	<filteredResources>
+		<filter>
+			<id>1757258733415</id>
+			<name></name>
+			<type>30</type>
+			<matcher>
+				<id>org.eclipse.core.resources.regexFilterMatcher</id>
+				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
+			</matcher>
+		</filter>
+	</filteredResources>
+</projectDescription>
diff --git a/node_modules/cactus-react-native/cactus-react-native.podspec b/node_modules/cactus-react-native/cactus-react-native.podspec
index 5225f9d..4cceae4 100644
--- a/node_modules/cactus-react-native/cactus-react-native.podspec
+++ b/node_modules/cactus-react-native/cactus-react-native.podspec
@@ -32,7 +32,7 @@ Pod::Spec.new do |s|
   s.pod_target_xcconfig = {
     "OTHER_LDFLAGS" => base_ld_flags,
     "OTHER_CFLAGS" => base_optimizer_flags,
-    "OTHER_CPLUSPLUSFLAGS" => base_optimizer_flags + " -std=c++17"
+    "OTHER_CPLUSPLUSFLAGS" => base_optimizer_flags + " -std=c++20"
   }
 
   # Don't install the dependencies when we run `pod install` in the old architecture.

This issue body was partially generated by patch-package.