关于Undefined symbols for architecture x86

最近在Mac上做一个程序，需要调用动态链接库，出现两次Undefined symbols for architecture x86_64的错误，所以总结下。

第一个是：

Undefined symbols for architecture x86_64: "_iconv_open", referenced from:

_main in main.o "_iconv", referenced from: _main in main.o "_iconv_close", referenced from:

_main in main.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

我的编译环境是QT，出这个错的原因是没有链接iconv这个库，所以链接就可以了：QMAKE_LFLAGS += -liconv -freamework coreFoundation -framework VideoDecodeAcceleration -framework Quartzcore - framework

第二个是Undefined symbols for architecture x86_64: "_memalign", referenced from: main..........................

出这个错的原因是移植到Mac上之后 main里面调用了memalign，但是Mac上屏蔽了memalign。所以找到memalign函数所在的文件，添加到工程里编译链接。检查

是否屏蔽（解除屏蔽）就可以了

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