[SOLVED] linker error in make

prkhr4u · 10-04-2013, 11:53 PM

I am trying to run 'make' command on a cpp file.The makefile has been provided.
After i issue make command the command elaborates to:

Code:

/usr/bin/g++ -I/opt/pylon/genicam/library/CPP/include -I/opt/pylon/include -DUSE_GIGE  -c -o AcquireContinuous.o AcquireContinuous.cpp
/usr/bin/g++ -L/opt/pylon/lib64 -L/opt/pylon/lib -L/opt/pylon/genicam/bin/Linux64_x64 -L/opt/pylon/genicam/bin/Linux64_x64/GenApi/Generic -L/opt/pylon/genicam/bin/Linux32_i86 -L/opt/pylon/genicam/bin/Linux32_i86/GenApi/Generic -Wl,-E -o AcquireContinuous AcquireContinuous.o -lpylonbase

Then 1 linker error is coming as:

Code:

/usr/bin/ld: AcquireContinuous.o: undefined reference to symbol 'GenICam::GenericException::what() const'
/usr/bin/ld: note: 'GenICam::GenericException::what() const' is defined in DSO /opt/pylon/genicam/bin/Linux32_i86/libGCBase_gcc40_v2_1.so so try adding it to the linker command line
/opt/pylon/genicam/bin/Linux32_i86/libGCBase_gcc40_v2_1.so: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
make: *** [AcquireContinuous] Error 1

I have got many solutions on google,but failed to rectify it.
I am not familiar with LD and linking.
Could someone pl guide step by step for this issue.

using ubuntu 12.04 32 bit
Note: code correctly compiling and linking in RHEL6

prkhr4u · 10-05-2013, 12:52 AM

I contact the camera technical support,they have given me the exact solution but i do not know how to implement this,pl help
Their solution is:

Quote:

It turns out that this problem is caused by changing the Linker behavior in newer Linux distributions, i.e. Ubuntu 11.04 or 11.10, Fedora 13 etc.

That is, up to the above mentioned revisions, the Linker used to search for dependent libraries (indirect linking of shared library symbols) automatically. In the case of pylon, it is the libGCBase_gcc40_v2_1.

However, from e.g. Ubuntu 11.04 on all shared libs must be explicitly added to the command-line compiler flags in order to be found during compilation.

Hence, in this given case, use the following command-line switch:

-lGCBase_gcc40_v2_1

More information on that can be found under:
https://wiki.ubuntu.com/NattyNarwhal...hainTransition

Can someone tell step by step what to do..

The Makefile is like this:

Code:

# Makefile for Basler Pylon sample program
.PHONY			: all clean

# the program to build
NAME			:= AcquireContinuous


# Build tools and flags
CXX			:= /usr/bin/g++
LD			:= /usr/bin/g++
CPPFLAGS		:= -I$(GENICAM_ROOT_V2_1)/library/CPP/include \
			   -I$(PYLON_ROOT)/include -DUSE_GIGE
CXXFLAGS		:=    			#e.g., CXXFLAGS=-g -O0 for debugging

# To keep the makefile for 32 and 64 in sync we add 64 and 32-bit library paths
# If you are targeting only 32 bit for you can remove the entries containing "64"
LDFLAGS			:= -L$(PYLON_ROOT)/lib64 \
			   -L$(PYLON_ROOT)/lib \
			   -L$(GENICAM_ROOT_V2_1)/bin/Linux64_x64 \
			   -L$(GENICAM_ROOT_V2_1)/bin/Linux64_x64/GenApi/Generic \
			   -L$(GENICAM_ROOT_V2_1)/bin/Linux32_i86 \
			   -L$(GENICAM_ROOT_V2_1)/bin/Linux32_i86/GenApi/Generic \
			   -Wl,-E
LIBS			:= -lpylonbase,-lGCBase_gcc40_v2_1

all			: $(NAME)

$(NAME)			: $(NAME).o
	$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)

$(NAME).o		: $(NAME).cpp
	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c -o $@ $<

clean			:
	$(RM) $(NAME).o $(NAME)

colucix · 10-05-2013, 01:50 AM

Quote:

Originally Posted by prkhr4u

Can someone tell step by step what to do..

Code:

LIBS			:= -lpylonbase,-lGCBase_gcc40_v2_1

The Makefile already has the solution: they added -lGCBase_gcc40_v2_1 to the list of libraries that is used by the $(LD) command some lines below. I have doubts about the comma as separator (if it doesn't work change it to a blank space. Anyway, it's not clear what Makefile is this? This doesn't seem the one you had when trying make the first time, since in the command line you posted there is only -lpylonbase. If it is a Makefile they provided along with their support, you simply have to substitute the Makefile in the main installation directory and run make again.

prkhr4u · 10-05-2013, 04:45 AM

I have added -lGCBase_gcc40_v2_1 after running make.
Anyways I tried a bit,and now i am able to fix the issue.

My resolution was:
$(NAME) : $(NAME).o
$(LD) $(LDFLAGS) -o $@ $^ $(LIBS) -lGCBase_gcc40_v2_1

while keeping LLIBS := -lpylonbase

only.

Thanks for the help!!

colucix · 10-05-2013, 05:52 AM

Well done!

NevemTeve · 10-06-2013, 11:19 PM

a little fix:

Code:

old: LIBS			:= -lpylonbase,-lGCBase_gcc40_v2_1
new: LIBS			:= -lpylonbase -lGCBase_gcc40_v2_1