Clang -rewrite-objc

通过runtime转换OC为c++，在终端执行

 $ clang -rewrite-objc /Users/sanyolewis/Desktop/ffsdf/ffsdf/AppDelegate.m

但是会报错，

 $ clang -rewrite-objc /Users/sanyolewis/Desktop/ffsdf/ffsdf/AppDelegate.m  
In file included from /Users/sanyolewis/Desktop/ffsdf/ffsdf/AppDelegate.m:9:
/Users/sanyolewis/Desktop/ffsdf/ffsdf/AppDelegate.h:9:9: fatal error: 
      'UIKit/UIKit.h' file not found
#import <UIKit/UIKit.h>
        ^~~~~~~~~~~~~~~
1 error generated.

最终解决方案：

clang -x objective-c -rewrite-objc -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk hahahah.m

但是每次这么输入太繁琐，因此可以通过alias进行简化处理

 $ vim ~/.bash_profile

source ~/.profile
alias rewriteoc='clang -x objective-c -rewrite-objc -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk'
[[ -s "$HOME/.profile" ]] && source "$HOME/.profile" # Load the default .profile
         
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm" # Load RVM into a shell session *as a function*
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"~/.bash_profile" 5L, 393C

然后保存退出，ESC + :wq

 $ source ~/.bash_profile
 $ rewriteoc /Users/sanyolewis/Desktop/LearnOpenGLES-master/LearnOpenGLES/LearnOpenGLES/AppDelegate.m
clang: warning: using sysroot for 'iPhoneSimulator' but targeting 'MacOSX' [-Wincompatible-sysroot]
/var/folders/7f/z7cl7cqs1svctn_dcq8kccjw0000gn/T/AppDelegate-b92d03.mi:12793:188: warning: 
      'kCFCalendarUnitWeek' is deprecated: first deprecated in macOS 10.10 - Use
      kCFCalendarUnitWeekOfYear or kCFCalendarUnitWeekOfMonth instead
      [-Wdeprecated-declarations]
  ...or NSCalendarUnitWeekOfYear, depending on which you mean"))) = kCFCalend...
                                                                    ^
/var/folders/7f/z7cl7cqs1svctn_dcq8kccjw0000gn/T/AppDelegate-b92d03.mi:5142:2: note: 
      'kCFCalendarUnitWeek' has been explicitly marked deprecated here
 kCFCalendarUnitWeek __attribute__((availability(macos,introduced=10.4,d...
 ^
1 warning generated.

这时已经有一个后缀为.cpp的C++文件了。

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