Eroare de compilare: main.cpp: In function 'char nextch()': main.cpp:21:58: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if(pos==BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos=0; ^ ./ccaLKnoR.o: In function `main': main.cpp:(.text.startup+0x496): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State> >, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10unique_ptrINS_6_StateESt14default_deleteIS1_EEPFvvE+0x11): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEEPFvvE+0x5f): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status Non zero exit status: 1