調度鏈接錯誤

Question

我曾經可以編譯一個異步Hello World風格的程序，但升級到Yosemite/Xcode 6後，出現鏈接錯誤。如何調整我的編譯指令以成功鏈接到調度庫？

代碼：

https://github.com/mcandre/parhello/tree/master/objc

跟蹤：

$ make 
mkdir -p bin/ 
clang -Wall -Wextra -Wmost -Weverything -framework Foundation -lobjc -fblocks -ldispatch -lBlocksRuntime -o bin/parhello ParHello.m 
ld: library not found for -ldispatch 
clang: error: linker command failed with exit code 1 (use -v to see invocation) 
make: *** [bin/parhello] Error 1 

系統：

$ specs clang xcode os 
Specs: 

specs 0.12 
https://github.com/mcandre/specs#readme 

clang --version 
Apple LLVM version 6.0 (clang-600.0.54) (based on LLVM 3.5svn) 
Target: x86_64-apple-darwin14.0.0 
Thread model: posix 

xcodebuild -version 
Xcode 6.1 
Build version 6A1052d 

system_profiler SPSoftwareDataType | grep 'System Version' 
System Version: OS X 10.10.1 (14B25) 

Answer 1

你看到這些錯誤的原因是因爲Makefile文件是爲一個Linux系統，你正在MacOS下建立。

如果我在你的Makefile從行改爲4：

LINK_OPTIONS=-ldispatch -lBlocksRuntime 

到

LINK_OPTIONS= 

目標編譯與看起來像輸出執行：

[parhello/objc]:;make 
mkdir -p bin/ 
clang -Wall -Wextra -Wmost -Weverything -framework Foundation -lobjc -fblocks -o bin/parhello ParHello.m 
bin/parhello 
2014-12-02 13:05:10.144 parhello[77009:2132933] e 
2014-12-02 13:05:10.144 parhello[77009:2132934] l 
2014-12-02 13:05:10.146 parhello[77009:2132944] ! 
2014-12-02 13:05:10.144 parhello[77009:2132937] 
2014-12-02 13:05:10.144 parhello[77009:2132936] o 
2014-12-02 13:05:10.144 parhello[77009:2132932] H 
2014-12-02 13:05:10.145 parhello[77009:2132940] r 
2014-12-02 13:05:10.144 parhello[77009:2132935] l 
2014-12-02 13:05:10.145 parhello[77009:2132942] l 
2014-12-02 13:05:10.144 parhello[77009:2132939] o 
2014-12-02 13:05:10.145 parhello[77009:2132943] d 
2014-12-02 13:05:10.144 parhello[77009:2132938] W