我正在测试eclipse C for Mac . 我有三个具体问题 .

  • 这是Mac的经典iostream问题 . 它不知道在哪里找到它 . 所以在项目属性中我添加了iostream所在的路径（Preferences-> C / C General-> Paths and Symbols-> includes） . 现在iostream有效 . 但我试图找到一种方法，我不必为每个新项目都这样做 . 是否有特定设置我可以选择自动为每个新项目包含此目录？

  • eclipse是否需要xCode才能工作？如果是的话，如果没有它，我怎么能让eclipse工作？ xCode占用6 GB .

  • 我在测试项目上遇到错误（见下文），我不确定如何修复 . 关于“链接器命令失败”的事情 . 我似乎能够很好地编译常规的C程序 . 请注意，此项目在Visual Studio中工作正常 .

23:37:30 ****增量构建配置调试项目pointClass *使所有构建目标：pointClass调用：MacOS X C Linker g -o "pointClass" ./point.o ./test.o
体系结构x86_64的未定义符号："std::istream::operator>>(double&)"，引用自：test.o中的_main“std :: ostream :: operator <<（std :: ostream＆（）（std :: ostream＆））", referenced from: _main in test.o Point::Point(double, double) in test.o Point::Point(Point const&) in test.o " std :: ostream :: operator << （double）", referenced from: _main in test.o Point::Point(double, double) in test.o " std :: basic_string，std :: allocator> :: ~basic_string（）", referenced from: _main in test.o " std :: ios_base :: Init :: Init（）", referenced from: ___cxx_global_var_init in test.o " std :: ios_base :: Init :: ~Init（）", referenced from: ___cxx_global_var_init in test.o " std： ：cin ", referenced from: _main in test.o " std :: cout ", referenced from: _main in test.o Point::Point(double, double) in test.o Point::Point(Point const&) in test.o " std :: basic_ostream>＆std :: endl>（std :: basic_ostream>＆）", referenced from: _main in test.o Point::Point(double, double) in test.o Point::Point(Point const&) in test.o " std :: basic_ostream>＆std :: operator <<>（std :: basic_ostream> &&，char const）", referenced from: _main in test.o Point::Point(double, double) in test.o Point::Point(Point const&) in test.o " std :: basic_ostream>＆std :: operator <<，std :: allocator>（std :: basic_ostream>＆，std :: basic_string，std :: allocator> const＆）“，引自：测试中的_main . o ld：找不到架构x86_64 clang的符号：错误：链接器命令失败，退出代码为1（使用-v查看调用）make： [pointClass]错误1

c++ eclipse macos