g++ - .NET incompatibility??

This is a discussion on g++ - .NET incompatibility?? within the C++ Programming forums, part of the General Programming Boards category; It compiles in .NET; g++ gives me this > g++ prog1.cpp Undefined first referenced symbol in file PCB::~PCB [in-charge]() /var/tmp//ccDyM5iy.o ...

  1. #1
    unleashed alphaoide's Avatar
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    g++ - .NET incompatibility??

    It compiles in .NET; g++ gives me this
    > g++ prog1.cpp
    Undefined first referenced
    symbol in file
    PCB::~PCB [in-charge]() /var/tmp//ccDyM5iy.o
    operator>>(std::basic_istream<char, std::char_traits<char> >&, PCB&)/var/tmp//cc
    DyM5iy.o
    operator<<(std::basic_ostream<char, std::char_traits<char> >&, PCB const&)/var/t
    mp//ccDyM5iy.o
    PCB::getStateStatus() const /var/tmp//ccDyM5iy.o
    PCB::operator>(PCB const&) const /var/tmp//ccDyM5iy.o
    PCB::PCB[in-charge](int, int, int, int, int, int, void const*)/var/tmp//ccDyM5iy
    .o
    ld: fatal: Symbol referencing errors. No output written to a.out
    collect2: ld returned 1 exit status
    titan/jsigar >
    The following is a little bit of everything
    Code:
    PCB::~PCB() 
    {
      // this section is intentionally left blank
    }
    ...
    std::ostream &operator<<(std::ostream &stream, const PCB &pcb)
    {
      stream << pcb.pid << " ";
      stream << pcb.arrival_time << " ";
      stream << pcb.last_cpu_burst << " ";
      stream << pcb.test_cpu_burst << " ";
      stream << pcb.priority << " ";
      stream << pcb.state_status << " ";
      if (pcb.hook != NULL) {
        stream << reinterpret_cast<const char *>(pcb.hook);
      }
    
      return stream;
    }
    ...
    int PCB::getStateStatus() const
    {
      return state_status;
    }
    ...
    bool PCB::operator>(const PCB &anotherPCB) const
    {
      return (priority > anotherPCB.priority);
    }
    Note that I'm so illiterate in UNIX so will need clear answer. Thnx!
    source: compsci textbooks, cboard.cprogramming.com, world wide web, common sense

  2. #2
    and the hat of wrongness Salem's Avatar
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    Did you compile all the files, or is everything in prog1.cpp?

    Eg.
    g++ prog1.cpp pcb.cpp

    The error messages are basically telling you that it can't find the symbols necessary to complete the executable file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    unleashed alphaoide's Avatar
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    g++ prog1.cpp pcb.cpp
    Ohh, that's how you do it. I did "g++ prog1.cpp" only and I though it will compile evertyhing that's l inked to "prog1.cpp". Thnx, it works now.
    source: compsci textbooks, cboard.cprogramming.com, world wide web, common sense

  4. #4
    and the hat of wrongness Salem's Avatar
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    When you have a few more files, you will want to investigate using makefiles, which are the equivalent of VC++ project files.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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