iOS拓展---[轉載]使用clang將OC代碼轉爲C++（親測有效）

[轉載]使用clang將OC代碼轉爲C++（親測有效）

2018年11月19日 10:08:47 蝸牛非牛 閱讀數：149

 

最近在研究RunLoop運行機制，想看看他的底層代碼是什麼樣子的，因而百度看看你們如何操做的。最終絕望的發現基本的操做都同樣，然並卵。

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

顯示異常以下：

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.

試了屢次，發現仍是報一樣的錯誤，因而只能繼續耐心的看看還有沒有不一樣的操做，最終獲得了一個完美的操做：

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

轉換成功

補充一下

指定真機

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

指定模擬器

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

指定SDK版本

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

Ç語言轉C ++

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

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

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