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fatal error: 'boost/preprocessor/control/expr_iif.hpp' file not found

I have a React Native project. I recently updated to macOS Big Sur 11.3 and XCode Version 12.5 (12E262).

When I build the project in XCode I get the following error:

../ios/Pods/Headers/Public/Flipper-Folly/folly/functional/Invoke.h:22:10: fatal error: 'boost/preprocessor/control/expr_iif.hpp' file not found
#include <boost/preprocessor/control/expr_iif.hpp>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

When I browse to Pods folder, expr_iif.hpp file exists.

I tried removing Pods folder, Podfile.lock, .xcworkspace. Deleted npm cache. Then ran pod install.

But no luck.

This build-time error is thrown by Flipper-RSocket and Flipper-Folly.

I can provide further details if requested.

Solution

  • I just had this issue and it happens when you have incompatible versions of Flipper pods.

    This worked for me:

    1. Update your Podfile to install Flipper like this:
    use_flipper!({ 'Flipper' => '0.93.0', 'Flipper-Folly' => '2.6.7', 'Flipper-DoubleConversion' => '3.1.7' })
    1. Update deployment target on both Podfile and Xcode project o 12.1 or newer:
    platform :ios, '12.1'
    1. Remove Podfile.lock
    2. pod install --repo-update
    3. Close and re-open the Xcode project

    You may also try fixing permissions if the above is not enough for you:

    chmod -R 755 ios/Pods/boost-for-react-native

    The error went away after this.