HPUX, shared library and static member variables

From: Torsten Mueller (Homunkulus_at_gmx.net)
Date: 01/31/05

  • Next message: Steve: "file length..." 
    Date: Mon, 31 Jan 2005 08:22:23 +0100

    I have to create a shared library containing C++ classes with static
    member variables on HPUX with aCC. I can compile and link the library
    and a test application but when I start the program I get errors like
    these:

      /usr/lib/dld.sl: Unresolved symbol: namespaces (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: m_mapFielTypeIDsUBSHaben__Q2_10Validators9CBaseCopy (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: m_mapFielTypeIDsPFHaben__Q2_10Validators9CBaseCopy (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: typeid__XTQ2_10Validators9CBaseCopy_ (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: m_mapFielTypeIDsUBSSoll__Q2_10Validators9CBaseCopy (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: m_mapFielTypeIDsPFSoll__Q2_10Validators9CBaseCopy (data) from /beda/lib/libLogicalValidation.sl
      /usr/lib/dld.sl: Unresolved symbol: typeid__XTQ2_10Validators21CUBSKtoSplitValidator_ (data) from /beda/lib/libLogicalValidation.sl

    All these unresolved symbols are private static member variables. I
    think their instances (sure they have instances) are not exported from
    the shared library.

    I compile my source files using the following command line:

      aCC -g0 +Z -I ... -c -o ... $<

    -g0 produces debugger information, +Z makes position independent code,
    -I, -c and -o are as usual. I link the shared library using this:

      aCC -g0 -b -n -L ... -l ... -o ... $(OBJ)

    The aCC man page says:
    -----------------------------------------------------------------
    -b Cause the linker ld(1) to create a shared library
              rather than a normal executable file. Object files
              processed with this option must contain position
              independent code (PIC). For details see ld(1), HP-UX
              Linker and Libraries Online User's Guide and the
              Programming on HP-UX manual.

    -n Cause the output file from the linker to be marked as
              shareable. For details and system defaults, see ld(1).
    -----------------------------------------------------------------

    Do I have to use any other specific compiler switch to export static
    variables? Or do I have to use a specific construction in my code? Did
    anybody have this problem?

    T.M.

  • Next message: Steve: "file length..."

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