1、Ecplise中, 右鍵 project -> Properties -> C\C++ Build -> Tool Chain Editor.
Current Builder: 選擇 'Gnu make builder' -> Apply (或者 Ok).
問題原因:選擇了不支援GCC、G++兩種編譯器的builder, 'CDT internal builder'
參考:
Build project has encountered a problemm Eclipse C++. - Stack Overflow