[expo-gl][expo-gl-cpp]#import <future> file not found in bare react-native project

🐛 Bug Report

Summary of Issue

Adding react-native-unimodules, expo-gl, and expo-gl-cpp has caused some build errors in my Xcode project. I followed installing unimodules documentation.

The errors

• node_modules/expo-gl-cpp/cpp/EXGLContext.h:15:10: ‘future’ file not found
• node_modules/expo-gl/ios/EXGL/EXGLView.h:3:9: Could not build module ‘EXGL_CPP’

My Podfile

platform :ios, '11.1'
require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'
require_relative '../node_modules/react-native-unimodules/cocoapods.rb'

target 'MyTarget' do
  use_frameworks!
  use_unimodules!

  config = use_native_modules!
  use_react_native!(:path => config["reactNativePath"])

end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.name == "React-Core"
        target.build_configurations.each do |config|
          config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= ['$(inherited)']
          config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] << 'RCTLOG_REDBOX_LEVEL=RCTLogLevelFatal'
        end
    end
  end
end

Any suggestions for a fix would be appreciated. Thanks.

Environment - output of expo diagnostics & the platform(s) you’re targeting

Reproducible Demo

Steps to Reproduce

npx react-native init AwesomeProject
cd AwesomeProject
npm i -S react-native-unimodules expo-gl expo-gl-cpp
# edit AppDelegate.m according to unimodules installation instructions
# edit Podfile according to unimodules installation instructions
# add use_frameworks! below use_unimodules!
# comment out the flipper section of the Podfile
cd ios && pod install && cd ..
npx react-native start
# open a second terminal
npx react-native run-ios

Alternatively, the .xcworkspace file can be opened in Xcode and the errors can be viewed there.

Expected Behavior vs Actual Behavior

The Xcode project is expected to build without failure.

[DingSoung]

usually Xcode buildsetting - GCC_INPUT_FILETYPE is set to automatic (by file type)

if a header is imported by c file, it will be combined as c, if is imported by cpp file, it will be combined as cpp

I have check EXGLContext.h is always imported by cpp file, so the source code is correct.

finally I found EXGLContext.h is imported by EXG_CPP-umbrella.h, witch is combined by automatic（default obj-c)

#ifdef __OBJC__
#import <UIKit/UIKit.h>
#else
#ifndef FOUNDATION_EXPORT
#if defined(__cplusplus)
#define FOUNDATION_EXPORT extern "C"
#else
#define FOUNDATION_EXPORT extern
#endif
#endif
#endif

#import "EXiOSUtils.h"
#import "EXJSConvertTypedArray.h"
#import "EXJSUtils.h"
#import "stb_image.h"
//#import "EXGLContext.h"
#import "UEXGL.h"
#import "UEXGLcppheader.cpp.h"

FOUNDATION_EXPORT double EXGL_CPPVersionNumber;
FOUNDATION_EXPORT const unsigned char EXGL_CPPVersionString[];

solution

    ss.private_header_files = '**/{EXGLContext.h}'

[DingSoung]

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