Thread: build error -- can not find operator new

  1. #1
    Registered User
    Join Date
    May 2006

    build error -- can not find operator new

    Hello everyone,

    I am using Red Hat Enterprise Linux 4 with gcc version 3.4.5. Here is my issue,

    1. I have a shared library called wirtten in C++ and has C interface (extern C wrapper);
    2. I have another shared called, which is written in C and is dependent on, and I am using -lA to build shared library and it is successful;
    3. I have an application called C, which is written in C and is dependent on shared library, and when using -lB -lA to build the application C, here are the link error messages,

    .// undefined reference to `operator new[](unsigned int)
    .// undefined reference to `operator delete(void*)
    .// undefined reference to `__gxx_personality_v0

    For the whole process, I am using gcc other than g++. And I am wondering how to solve this issue in step 3?

    I think we are able to build C application with dependent C++ shared library, right?

    thanks in advance,

  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    Add -lg++ I think.

    Or use "g++" to link your application, and it should add it by default - there is no reason you can't compile and link with g++ even for plain C.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    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.

  4. #4
    Registered User
    Join Date
    Apr 2006
    Quote Originally Posted by Salem View Post
    If the library is built with a C wrapper, then presumably it is intended to be callable from a C program.

    I would look at the library vender's site. There is no standard way to link C++ source code into a C program. C does not have any portable functionality to link code written in any language accept assembly. If somebody wrote a library in C++ that an be called from C, it would be up to them to explain how to link the code.
    It is too clear and so it is hard to see.
    A dunce once searched for fire with a lighted lantern.
    Had he known what fire was,
    He could have cooked his rice much sooner.

  5. #5
    Officially An Architect brewbuck's Avatar
    Join Date
    Mar 2007
    Portland, OR
    You need to link with -lstdc++.

    But really, you should be using g++ to link, not gcc. It doesn't matter if the code is C or C++, g++ can link it either way.

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