libjson.so: undefined reference to `isinf'
libjson.so: undefined reference to `isnan'
collect2: ld returned 1 exit status
解决办法:在连接选项中添加 -lm
libxml2.so: undefined reference to `dlerror'
libxml2.so: undefined reference to `dlclose'
libxml2.so: undefined reference to `dlopen'
libxml2.so: undefined reference to `dlsym'
collect2: ld returned 1 exit status
链接的时候添加-ldl
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