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Core Development Tools/Discussion/General/Undefined reference error/List of Posts
Forum Topic - Undefined reference error: (20 Items)
   
Update
Girisha SG
09/02/2010 7:29 AM
post65624
Undefined reference error   
1st scenario.

I am having 4 library projects and one application project. Application project is using all the 4 library files.
The libraries are BasicSignalProcessing, ePIAF, FileIO, MainMixer and application is MainMixerTestApplication.

1. ePIAF library project has the reference(Project References) on BasicSignalProcessing.
2. FileIO library project has the reference(Project References) on BasicSignalProcessing and ePIAF library project.
3. MainMixer library project has the reference(Project References) on BasicSignalProcessing and ePIAF library project. 
4. MainMixerTestApplication application project has the reference(Project References) on BasicSignalProcessing, ePIAF, 
FileIO and MainMixer library projects.

Individual libraries are getting built properly but MainMixerTestApplication is failing with error 'undefined reference 
to ...'.
I have added the necessary include folders in search paths and I am linking the above libraries by including them in 
'Properties->QNX C/C++ Project->Linker->Extra library paths'

Attached the build log for your reference.

Can anyone tell me what is the exact reason and how to get rid of this CRITICAL error ?

2nd scenario.

I have created a TestLib library project and TestMain application project where main function calls the TestLibProc 
function implemented in the test library. In this also I am getting similar error even though I am including the library
 while linking and it is getting resolved only if I include the OBJ file(TestLib.o) in the linker(Same is not happening 
in the 1st example as it is flashing an error in both MainMixer & MainMixerTestApplication). I feel including OBJ file 
is a crude method.
Attachment: Text ErrorLog.txt 17.48 KB
Girisha SG
09/02/2010 9:21 AM
post65640
Re: Undefined reference error   
I have added the following command to in the 'other options' of the linker

'-Bstatic -lFileIO -lBasicSignalProcessing -lePIAF -lMainMixer -lm' and I am getting the below error :( ...

It is really IMPORTANT for us to get rid of these kind of errors ...

C:/ide-4.7-workspace/MainMixerTestApplication/private/exampleAppMainMixer.c:344: warning: 'fpOutName1' is used 
uninitialized in this function
C:/ide-4.7-workspace/MainMixerTestApplication/private/exampleAppMainMixer.c:352: warning: 'fpOutName2' is used 
uninitialized in this function
C:/QNX650/host/win32/x86/usr/bin/rm -f  C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/
MainMixerTestApplication_g
C:/QNX650/host/win32/x86/usr/bin/qcc -Vgcc_ntoarm -Wl,--no-keep-memory  -Bstatic -lFileIO -lBasicSignalProcessing -
lePIAF -lMainMixer -lm    -oC:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/MainMixerTestApplication_g    
exampleAppMainMixer.o   -L . -L C:/ide-4.7-workspace/FileIO/arm/a-le-g -L C:/ide-4.7-workspace/BasicSignalProcessing/arm
/a-le-g -L C:/ide-4.7-workspace/ePIAF/arm/a-le-g -L C:/ide-4.7-workspace/MainMixer/arm/a-le-g -L C:/QNX650/target/qnx6/
armle/lib -L C:/QNX650/target/qnx6/armle/usr/lib  -Wl,--rpath-link . -Wl,--rpath-link C:/ide-4.7-workspace/FileIO/arm/a-
le-g -Wl,--rpath-link C:/ide-4.7-workspace/BasicSignalProcessing/arm/a-le-g -Wl,--rpath-link C:/ide-4.7-workspace/ePIAF/
arm/a-le-g -Wl,--rpath-link C:/ide-4.7-workspace/MainMixer/arm/a-le-g -Wl,--rpath-link C:/QNX650/target/qnx6/armle/lib -
Wl,--rpath-link C:/QNX650/target/qnx6/armle/usr/lib    -EL   -g       
C:\QNX650\host\win32\x86\usr\bin\ntoarm-ld: cannot find -lFileIO
make.exe[2]: Leaving directory `C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g'
make.exe[1]: Leaving directory `C:/ide-4.7-workspace/MainMixerTestApplication/arm'
cc: C:/QNX650/host/win32/x86/usr/bin/ntoarm-ld caught signal 1
make.exe[2]: *** [C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/MainMixerTestApplication_g] Error 1
make.exe[2]: Target `all' not remade because of errors.
make.exe[1]: [all] Error 2 (ignored)
Girisha SG
09/02/2010 10:24 AM
post65652
Re: Undefined reference error   
Looking like linker in the IDE is so bad that i is complaining about each and every linked library and it requires .o 
files to be specified !!! a crude requirement :) ofcourse along with the library !
Neil Schellenberger(deleted)
09/02/2010 11:52 AM
post65696
Re: Undefined reference error   
You need to set the linker search path so that it can find the
libraries.  You may want to consult the IDE documentation.

On Thu, 2010-09-02 at 10:24 -0400, Girisha SG wrote:
> Looking like linker in the IDE is so bad that i is complaining about each and every linked library and it requires .o 
files to be specified !!! a crude requirement :) ofcourse along with the library !
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post65652
>
Girisha SG
09/03/2010 1:12 AM
post65822
Re: Undefined reference error   
I had set the linker search path in 'linker->Extra library paths' and I had mentioned the library name in 'linker->Extra
 libraries' and even then i was getting the linker error however after specifying couple of object files in 'linker->
Extra object files' for MainMixerTestApplication(application) and MainMixer(library) it is getting built properly. 

I am of the opinion that specifying the object files in the project is a crude method. Ofcourse the libraries that are 
built are already using these object files and I am specifying these libraries while linking !!!

Any insights how I can get rid of this ?
Elena Laskavaia
09/02/2010 11:09 AM
post65683
Re: Undefined reference error   
All -l options should be at the end of the command line. Where is libFileIO.a?

On 02/09/10 09:21 AM, Girisha SG wrote:
> I have added the following command to in the 'other options' of the linker
> 
> '-Bstatic -lFileIO -lBasicSignalProcessing -lePIAF -lMainMixer -lm' and I am getting the below error :( ...
> 
> It is really IMPORTANT for us to get rid of these kind of errors ...
> 
> C:/ide-4.7-workspace/MainMixerTestApplication/private/exampleAppMainMixer.c:344: warning: 'fpOutName1' is used 
uninitialized in this function
> C:/ide-4.7-workspace/MainMixerTestApplication/private/exampleAppMainMixer.c:352: warning: 'fpOutName2' is used 
uninitialized in this function
> C:/QNX650/host/win32/x86/usr/bin/rm -f  C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/
MainMixerTestApplication_g
> C:/QNX650/host/win32/x86/usr/bin/qcc -Vgcc_ntoarm -Wl,--no-keep-memory  -Bstatic -lFileIO -lBasicSignalProcessing -
lePIAF -lMainMixer -lm    -oC:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/MainMixerTestApplication_g    
exampleAppMainMixer.o   -L . -L C:/ide-4.7-workspace/FileIO/arm/a-le-g -L C:/ide-4.7-workspace/BasicSignalProcessing/arm
/a-le-g -L C:/ide-4.7-workspace/ePIAF/arm/a-le-g -L C:/ide-4.7-workspace/MainMixer/arm/a-le-g -L C:/QNX650/target/qnx6/
armle/lib -L C:/QNX650/target/qnx6/armle/usr/lib  -Wl,--rpath-link . -Wl,--rpath-link C:/ide-4.7-workspace/FileIO/arm/a-
le-g -Wl,--rpath-link C:/ide-4.7-workspace/BasicSignalProcessing/arm/a-le-g -Wl,--rpath-link C:/ide-4.7-workspace/ePIAF/
arm/a-le-g -Wl,--rpath-link C:/ide-4.7-workspace/MainMixer/arm/a-le-g -Wl,--rpath-link C:/QNX650/target/qnx6/armle/lib -
Wl,--rpath-link C:/QNX650/target/qnx6/armle/usr/lib    -EL   -g       
> C:\QNX650\host\win32\x86\usr\bin\ntoarm-ld: cannot find -lFileIO
> make.exe[2]: Leaving directory `C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g'
> make.exe[1]: Leaving directory `C:/ide-4.7-workspace/MainMixerTestApplication/arm'
> cc: C:/QNX650/host/win32/x86/usr/bin/ntoarm-ld caught signal 1
> make.exe[2]: *** [C:/ide-4.7-workspace/MainMixerTestApplication/arm/o-le-g/MainMixerTestApplication_g] Error 1
> make.exe[2]: Target `all' not remade because of errors.
> make.exe[1]: [all] Error 2 (ignored)
> 
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post65640
>
Girisha SG
09/03/2010 1:13 AM
post65823
Re: Undefined reference error   
I had set the linker search path in 'linker->Extra library paths' and I had mentioned the library name in 'linker->Extra
 libraries' and even then i was getting the linker error however after specifying couple of object files in 'linker->
Extra object files' for MainMixerTestApplication(application) and MainMixer(library) it is getting built properly. 

I am of the opinion that specifying the object files in the project is a crude method. Ofcourse the libraries that are 
built are already using these object files and I am specifying these libraries while linking !!!

Any insights how I can get rid of this ?
Aleksandar Ristovski(deleted)
09/03/2010 11:36 AM
post65913
Re: Undefined reference error   
Can you list files in your

 C:/ide-4.7-workspace/FileIO/arm/a-
le-g


Does the library name have "_g" appendded, e.g. libFileIO_g.so ?

If so, you need to add it as "-lFileIO_g".
Girisha SG
09/06/2010 4:24 AM
post66038
Re: Undefined reference error   
waveFileFunctions.o
libFileIO_g.a
Makefile

are the threee files in this folder. However when I try to add new library using linker options tab it shows only one 
library 'static' and it seems to me that it actually links release version of the library
Aleksandar Ristovski(deleted)
09/07/2010 9:34 AM
post66129
Re: Undefined reference error   
The issue with the linker complaining about not finding "FileIO" was due
to you trying to link libFileIO.a and you had libFileIO_g.a in your -L
path.

What you are reporting now looks like you are adding both "-g" and
release paths in -L, release being first, and still specifying -lFileIO
which will link the "libFileIO.a" and NOT "libFileIO_g.a". For "_g" to
be linked, you need to specify "-lFileIO_g".


On Mon, 2010-09-06 at 04:24 -0400, Girisha SG wrote:
> waveFileFunctions.o
> libFileIO_g.a
> Makefile
> 
> are the threee files in this folder. However when I try to add new library using linker options tab it shows only one 
library 'static' and it seems to me that it actually links release version of the library


>From the command line you pasted in one of the previous posts, options
you pass to the linker (-L) show that only static libraries were listed
in the search path. Shared objects are in "so-le[-g]" directories.
Aleksandar Ristovski(deleted)
09/02/2010 1:03 PM
post65735
Re: Undefined reference error   
What are the actual files of your libraries? e.g. ePIAF, what is the
file name (full name)?


On Thu, 2010-09-02 at 07:29 -0400, Girisha SG wrote:
> 1st scenario.
> 
> I am having 4 library projects and one application project. Application project is using all the 4 library files.
> The libraries are BasicSignalProcessing, ePIAF, FileIO, MainMixer and application is MainMixerTestApplication.
> 
> 1. ePIAF library project has the reference(Project References) on BasicSignalProcessing.
> 2. FileIO library project has the reference(Project References) on BasicSignalProcessing and ePIAF library project.
> 3. MainMixer library project has the reference(Project References) on BasicSignalProcessing and ePIAF library project.
 
> 4. MainMixerTestApplication application project has the reference(Project References) on BasicSignalProcessing, ePIAF,
 FileIO and MainMixer library projects.
> 
> Individual libraries are getting built properly but MainMixerTestApplication is failing with error 'undefined 
reference to ...'.
> I have added the necessary include folders in search paths and I am linking the above libraries by including them in 
'Properties->QNX C/C++ Project->Linker->Extra library paths'
> 
> Attached the build log for your reference.
> 
> Can anyone tell me what is the exact reason and how to get rid of this CRITICAL error ?
> 
> 2nd scenario.
> 
> I have created a TestLib library project and TestMain application project where main function calls the TestLibProc 
function implemented in the test library. In this also I am getting similar error even though I am including the library
 while linking and it is getting resolved only if I include the OBJ file(TestLib.o) in the linker(Same is not happening 
in the 1st example as it is flashing an error in both MainMixer & MainMixerTestApplication). I feel including OBJ file is a crude method.
> 
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post65624
Girisha SG
09/03/2010 1:14 AM
post65824
Re: Undefined reference error   
I had set the linker search path in 'linker->Extra library paths' and I had mentioned the library name in 'linker->Extra
 libraries' and even then i was getting the linker error however after specifying couple of object files in 'linker->
Extra object files' for MainMixerTestApplication(application) and MainMixer(library) it is getting built properly. 

I am of the opinion that specifying the object files in the project is a crude method. Ofcourse the libraries that are 
built are already using these object files and I am specifying these libraries while linking !!!

Any insights how I can get rid of this ?
Elena Laskavaia
09/03/2010 9:57 AM
post65876
Re: Undefined reference error   
Could be problems with order of the libraries. Do they have circular dependencies?
Girisha SG
09/03/2010 10:49 AM
post65900
Re: Undefined reference error   
Yes I have circular dependencies.
Girisha SG
09/03/2010 10:52 AM
post65904
Re: Undefined reference error   
How to resolve it and also can you suggest some links to refer to ?
Girisha SG
09/03/2010 10:57 AM
post65906
Re: Undefined reference error   
sorry :( ... I have a relook at it but not very sure whether it has any circular dependency or not ... is there any 
other possibality also ?
Girisha SG
09/06/2010 9:29 AM
post66063
Re: Undefined reference error   
If there is a circular dependency how to resolve it ?
Elena Laskavaia
09/07/2010 8:17 AM
post66101
Re: Undefined reference error   
Get rid of it. Either create another library or move some object files from one library to another. Or have just one 
library. If library depend on each other there is no point having two of them - because both are always required.
Of cause you can do what you did before - give object files directly to linker but fixing circular dependency is best 
option.

On 06/09/10 09:29 AM, Girisha SG wrote:
> If there is a circular dependency how to resolve it ?
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post66063
>
Aleksandar Ristovski(deleted)
09/03/2010 10:06 AM
post65880
Re: Undefined reference error   
But is the actual name of the file of your library something like
"libePIAF.so", or literally "ePIAF"?



On Fri, 2010-09-03 at 01:14 -0400, Girisha SG wrote:
> I had set the linker search path in 'linker->Extra library paths' and I had mentioned the library name in 'linker->
Extra libraries' and even then i was getting the linker error however after specifying couple of object files in 'linker
->Extra object files' for MainMixerTestApplication(application) and MainMixer(library) it is getting built properly. 
> 
> I am of the opinion that specifying the object files in the project is a crude method. Ofcourse the libraries that are
 built are already using these object files and I am specifying these libraries while linking !!!
> 
> Any insights how I can get rid of this ?
> 
> 
> 
> _______________________________________________
> 
> General
> http://community.qnx.com/sf/go/post65824
>
Girisha SG
09/03/2010 10:51 AM
post65902
Re: Undefined reference error   
Library name is something like libePIAF.a but when I add it will take as ePIAF and I have referred to QNX document and 
according to that it is proper also as I have explained previously it is getting built after adding some more OBJECT 
files to resolve the dependencies.

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