React Native Build Failed CompileC error / Xcode 11.6 Workspace integrity error

Question

I am having an issue with building a react native project using the npx react-native run-ios command and am also unable to load the .xcworkspace file found in the project's ios folder with Xcode 11.6. I ran into issues ejecting from expo with my project and decided to build a bare workflow with react native from scratch. I start metro using

npx react-native start

but when I run

npx react-native run-ios

I get a build error. When I then try to build the project with Xcode, Xcode is unable to load the workspace file.

**What I've Tried: **

Xcode 11.6 load error:

When trying to load the .xcworkspace file for my project with Xcode 11.6, I receive 2 errors:

I have tried looking at other similar questions regarding this issue such as this question: XCode workspace integrity - couldn't load project (pods.xcodepoj) but was unable to resolve the error for Xcode. I thought this would resolve any issues related to the Podfile since this is the source of most issues related to the CompileC build error. I have also tried deleting the DerivedData folder for XCode from Preferences > Locations and clicked on the gray arrow to delete all the content found within DerivedData. I expected this to clear the cache, but the problem continued after trying to load the workspace file with Xcode.

npx react-native run-ios build error:

When running npx react-native run-ios to build my project I receive the following error in the terminal:

** BUILD FAILED **

The following build commands failed: CompileC /Users/macbookpro/Library/Developer/Xcode/DerivedData/RPi4BLETest-aymtjirbusdwgxdwltojdnzrjclc/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/React-Core.build/Objects-normal/x86_64/RCTDatePickerManager.o /Users/macbookpro/Desktop/JSProjects/RPi4BLETest/node_modules/react-native/React/Views/RCTDatePickerManager.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler failure)

For the npx react-native run-ios command, I tried the following: (https://github.com/facebook/react-native/issues/26118)

rm -rf ~/Library/Caches/CocoaPods rm -rf Pods rm -rf ~/Library/Developer/Xcode/DerivedData/* pod deintegrate pod setup

I also tried to comment out the folly lines found in the Podfile file in the ios folder, deleted the Podfile.lock file and ran

pod install

I also edited the folly lines of code in Podfile to use

use_flipper!({ 'Flipper-Folly' => '2.3.0' }) i

instead of

use_flipper!,

deleted Podfile.lock and ran pod install in the ios folder and still no resolution to the error. I have also tried using other commands such as yarn ios and npm run ios, but all of these give me the same error as the npx command.

I would like to know what the solution to resolving this error might be or any insight as to what could be causing it.