[LLVMdev] Linking problem in a pass

[Welson Sun]

HI Duncan,

Your understanding of the problem is correct. However, the XYZ class is not
inside an anonymous name space. Also, all the XYZ methods are defined in
the .cpp file. Looking at the error message:

opt: symbol lookup error: path/to/pass.so: undefined symbol:
_ZN12DataTransferD1Ev

Where DataTransfer is the class name. Maybe I am missing certain type of
constructors?

Thanks,
Welson




On Thu, Mar 1, 2012 at 10:00 AM, Duncan Sands <baldrick at free.fr> wrote:

> Hi Welson, are you saying that the .o file containing the class is being
> linked
> into the .so file, but nonetheless you get "undefined symbol XYZ" errors
> where
> XYZ is that class?  Maybe you defined the class inside an anonymous name
> space?
> Alternatively, if XYZ refers to a method of the class, maybe you forgot to
> define that method.
>
> Ciao, Duncan.
>
> On 01/03/12 17:36, Welson Sun wrote:
> > Originally, the problem is the lack of .cpp file. Then I noticed the
> compilation
> > log is not showing the .o file being generated for the non-pass classes.
> >
> > Then I added the .cpp files for each .h file, then the .o files are being
> > generated, shown in the Debug directory. Actually, if I add "VERBOSE =
> 1" in the
> > Makefile, it shows the linking command is actually linking all the .o
> files into
> > the pass.so file.
> >
> > Any help will be appreciated.
> >
> > Thanks!
> > Welson
> >
> >
> > On Thu, Mar 1, 2012 at 6:45 AM, John Criswell <criswell at illinois.edu
> > <mailto:criswell at illinois.edu>> wrote:
> >
> >     On 2/29/12 11:03 PM, Welson Sun wrote:
> >>     My pass uses another class which is defined in a separate .h file,
> which
> >>     sits in the same folder as the pass .cpp file. The pass compiles
> fine, but
> >>     when using the pass "opt -load ...", there is an error: opt symbol
> lookup
> >>     error  .... undefined symbol xxx,  where xxx is the class name. It
> looks
> >>     like that class file's object file is not linked into the pass.so
> file.
> >>     How should I change the Makefile to make the linking happen?
> >
> >     If your .cpp file isn't including the .h file, then the class in the
> .h file
> >     isn't being compiled and, therefore, isn't being included in the
> final
> >     library file.
> >
> >     Classes should be declared in header files and have their methods
> defined in
> >     .cpp files.  That's the easiest way to fix the problem.
> >
> >     -- John T.
> >
> >
> >>
> >>     Thanks,
> >>     Welson
> >>
> >>
> >>     _______________________________________________
> >>     LLVM Developers mailing list
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> http://llvm.cs.uiuc.edu
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> >
> >
> >     _______________________________________________
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> http://llvm.cs.uiuc.edu
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> >
> >
> >
> >
> > --
> > Welson
> >
> > Phone: (408) 418-8385
> > Email: welson.sun at gmail.com <mailto:welson.sun at gmail.com>
> >
> >
> >
> >
> > _______________________________________________
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-- 
Welson

Phone: (408) 418-8385
Email:  welson.sun at gmail.com
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