[LLVMdev] Linking problem in a pass

[Welson Sun]

OK, problem found! Inspired by Duncan's message, I double checked the XYZ
class, and what I was missing is the definition of the destructor! What a
stupid mistake!

Thanks,
Welson



On Thu, Mar 1, 2012 at 1:09 PM, Welson Sun <welson.sun at gmail.com> wrote:

> 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
>> >>
>> >>
>> >>     _______________________________________________
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>> http://llvm.cs.uiuc.edu
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>> >
>> >
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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
>
>
>


-- 
Welson

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