Thread: Error Linking with IUP toolkit

  1. #1
    Registered User
    Join Date
    Dec 2011

    Error Linking with IUP toolkit


    Been trying to compile a simple C program using the open source IUP toolkit provided by Tecgraf (makers of Lua). Keep getting the error below:

    Based on the documentation the following libraries are dependancies:
    iupwin* -> gdi32 user32 comdlg32 comctl32 ole32 (system - Windows)
    button.o is a sample program provided in the IUP distribution

    gcc -L C:\dev\IUP\libs -o main.exe button.o libiup.a libiupcd.a libiupim.a -lgdi32 -luser32 -lcomdlg32 -lcomctl32 -lole32
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x229): undefined reference to `IID_IUnknown'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x245): undefined reference to `IID_IDropTarget'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x2a1): undefined reference to `IID_IUnknown'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x2bd): undefined reference to `IID_IDropSource'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x319): undefined reference to `IID_IUnknown'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x335): undefined reference to `IID_IEnumFORMATETC'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x391): undefined reference to `IID_IUnknown'
    libiup.a(iupwin_dragdrop.o):iupwin_dragdrop.c:(.text+0x3ad): undefined reference to `IID_IDataObject'
    collect2: ld returned 1 exit status
    make: *** [main.exe] Error 1
    Can anyone see the issue here...

  2. #2
    Registered User ledow's Avatar
    Join Date
    Dec 2011
    Put the libraries in your library path and then just -liup etc.

    And check that they are in fact linkable libraries with those functions exported.

    - Compiler warnings are like "Bridge Out Ahead" warnings. DON'T just ignore them.
    - A compiler error is something SO stupid that the compiler genuinely can't carry on with its job. A compiler warning is the compiler saying "Well, that's bloody stupid but if you WANT to ignore me..." and carrying on.
    - The best debugging tool in the world is a bunch of printf()'s for everything important around the bits you think might be wrong.

  3. #3
    'Allo, 'Allo, Allo
    Join Date
    Apr 2008
    Or you could just add -luuid after -lole32

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