iOS拓展---[转载]使用clang将OC代码转为C++（亲测有效）

[转载]使用clang将OC代码转为C++（亲测有效）

2018年11月19日 10:08:47 蜗牛非牛 阅读数：149

 

最近在研究RunLoop运行机制，想看看他的底层代码是什么样子的，于是百度看看大家如何操作的。最终绝望的发现基本的操作都一样，然并卵。

1. zhangquaniMac:3456 zq$ cd /Users/zq/Desktop/3456/3456
2. zhangquaniMac:3456 zq$ clang -x objective-c -rewrite-objc -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk ViewController.m

显示异常如下：

1. clang: warning: using sysroot for 'iPhoneSimulator' but targeting 'MacOSX' [-Wincompatible-sysroot]
2. warning: include path for stdlibc++ headers not found; pass '-std=libc++' on the
3. command line to use the libc++ standard library instead
4. [-Wstdlibcxx-not-found]
5. 1 warning generated.
6. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:12856:188: warning:
7. 'kCFCalendarUnitWeek' is deprecated: first deprecated in macOS 10.10 - Use
8. kCFCalendarUnitWeekOfYear or kCFCalendarUnitWeekOfMonth instead
9. [-Wdeprecated-declarations]
10. ...or NSCalendarUnitWeekOfYear, depending on which you mean"))) = kCFCalend...
11. ^
12. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:5156:2: note:
13. 'kCFCalendarUnitWeek' has been explicitly marked deprecated here
14. kCFCalendarUnitWeek __attribute__((availability(macos,introduced=10.4,d...
15. ^
16. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22487:16: warning:
17. 'ns_returns_retained' attribute only applies to functions that return an
18. Objective-C object [-Wignored-attributes]
19. __attribute__((__ns_returns_retained__)) _Nullable sec_trust_t
20. ^
21. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22493:16: warning:
22. 'ns_returns_retained' attribute only applies to functions that return an
23. Objective-C object [-Wignored-attributes]
24. __attribute__((__ns_returns_retained__)) _Nullable sec_identity_t
25. ^
26. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22496:16: warning:
27. 'ns_returns_retained' attribute only applies to functions that return an
28. Objective-C object [-Wignored-attributes]
29. __attribute__((__ns_returns_retained__)) _Nullable sec_identity_t
30. ^
31. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22505:16: warning:
32. 'ns_returns_retained' attribute only applies to functions that return an
33. Objective-C object [-Wignored-attributes]
34. __attribute__((__ns_returns_retained__)) _Nullable sec_certificate_t
35. ^
36. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22521:16: warning:
37. 'ns_returns_retained' attribute only applies to functions that return an
38. Objective-C object [-Wignored-attributes]
39. __attribute__((__ns_returns_retained__)) _Nullable dispatch_data_t
40. ^
41. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22555:16: warning:
42. 'ns_returns_retained' attribute only applies to functions that return an
43. Objective-C object [-Wignored-attributes]
44. __attribute__((__ns_returns_retained__)) _Nullable dispatch_data_t
45. ^
46. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:22559:16: warning:
47. 'ns_returns_retained' attribute only applies to functions that return an
48. Objective-C object [-Wignored-attributes]
49. __attribute__((__ns_returns_retained__)) _Nullable dispatch_data_t
50. ^
51. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:50310:13: warning:
52. 'CADisplayLink' is only available on macOS 10.14 or newer
53. [-Wunguarded-availability-new]
54. - (nullable CADisplayLink *)displayLinkWithTarget:(id)target selector:(S...
55. ^
56. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:33690:12: note:
57. 'CADisplayLink' has been explicitly marked partial here
58. @interface CADisplayLink : NSObject
59. ^
60. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:50310:1: note:
61. annotate 'displayLinkWithTarget:selector:' with an availability attribute
62. to silence this warning
63. - (nullable CADisplayLink *)displayLinkWithTarget:(id)target selector:(S...
64. ^
65. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52754:18: error:
66. 'UIWebView' is unavailable: not available on macOS
67. - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRe...
68. ^
69. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52702:281: note:
70. 'UIWebView' has been explicitly marked unavailable here
71. ...__attribute__((availability(macos,unavailable))) @interface UIWebView : ...
72. ^
73. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52755:30: error:
74. 'UIWebView' is unavailable: not available on macOS
75. - (void)webViewDidStartLoad:(UIWebView *)webView __attribute__((availabi...
76. ^
77. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52702:281: note:
78. 'UIWebView' has been explicitly marked unavailable here
79. ...__attribute__((availability(macos,unavailable))) @interface UIWebView : ...
80. ^
81. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52756:31: error:
82. 'UIWebView' is unavailable: not available on macOS
83. - (void)webViewDidFinishLoad:(UIWebView *)webView __attribute__((availab...
84. ^
85. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52702:281: note:
86. 'UIWebView' has been explicitly marked unavailable here
87. ...__attribute__((availability(macos,unavailable))) @interface UIWebView : ...
88. ^
89. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52757:18: error:
90. 'UIWebView' is unavailable: not available on macOS
91. - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)err...
92. ^
93. /var/folders/qc/wbfmgr1x6f9246c0jt6yqt100000gn/T/ViewController-4ce726.mi:52702:281: note:
94. 'UIWebView' has been explicitly marked unavailable here
95. ...__attribute__((availability(macos,unavailable))) @interface UIWebView : ...
96. ^
97. 9 warnings and 4 errors generated.

试了多次，发现还是报同样的错误，于是只能继续耐心的看看还有没有不同的操作，最终得到了一个完美的操作：

1. zhangquaniMac:~ zq$ cd /Users/zq/Desktop/3456/3456
2. zhangquaniMac:3456 zq$ xcrun -sdk iphonesimulator clang -rewrite-objc ViewController.m

转换成功

补充一下

指定真机

xcrun -sdk iphoneos clang -rewrite-objc ViewController.m

指定模拟器

xcrun -sdk iphonesimulator clang -rewrite-objc ViewController.m

指定SDK版本

xcrun -sdk iphonesimulator10.3 clang -rewrite-objc ViewController.m

Ç语言转C ++

1. zhangquaniMac:~ zq$ cd /Users/zq/Desktop/Test/Test
2. zhangquaniMac:Test zq$ clang -rewrite-objc main.c

参考：HTTPS：//cotin.tech/iOS/clang-rewrite-objc/

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