Problems linking--"undefined reference to..."
Peter Mills
peteymills@hotmail.com
Sat Jan 30 21:26:00 GMT 2010
I get two rather cryptic errors when I try to compile some of my own software. In the first, the software links fine normally, but when I
try to add debug information with the -g switch, I get the following
error or something similar:
$ make
g++ -I/home/Petey/include
-Wno-deprecated -g -o model1 model1.cc -L/home/Petey/lib -ldataset-g
-lpetey -lsparse-g -lgsl -lgslcblas
/tmp/cc5e9G8Z.o: In function
`_ZN7datasetD0Ev':
/home/Petey/include/simple_temp.h:(.dtors+0x0):
undefined reference to `global destructors keyed to x_grid'
/home/Petey/lib/libdataset-g.a(simple_temp-g.o):
In function `_ZN6simpleIdEeqIdEEiRKS_IT_E':
/home/Petey/my_software/datasets/simple_temp.cpp:(.dtors+0x0):
undefined reference to `global destructors keyed to
_ZN6simpleIfE8set_typeEv'
collect2: ld returned 1 exit status
make:
*** [model1] Error 1
(I create multiple versions of the
libraries by appending the optimization flag, e.g. -g, -O2 etc.)
The
second error, and the simpler-looking of the two, is as follows:
g++
-I/home/Petey/include -Wno-deprecated -O2 -o model2 model2.cc
traj_int_obj.o tcoord_defs.o -L/home/Petey/lib -ldataset-O2 -lpetey
-lsparse-O2 -lgsl -lgslcblas
model2.cc: In function `int main(int,
char**)':
model2.cc:140: warning: converting to `long int' from
`double'
traj_int_obj.o:traj_int_obj.cc:(.text+0x12): undefined
reference to `_mcount'
traj_int_obj.o:traj_int_obj.cc:(.text+0x6f):
undefined reference to `_mcount'
traj_int_obj.o:traj_int_obj.cc:(.text+0x165):
undefined reference to `_mcount'
traj_int_obj.o:traj_int_obj.cc:(.text+0x212):
undefined reference to `_mcount'
traj_int_obj.o:traj_int_obj.cc:(.text+0x382):
undefined reference to `_mcount'
traj_int_obj.o:traj_int_obj.cc:(.text+0x702):
more undefined references to `_mcount' follow
There is no variable
or function called "mcount" in traj_int_obj.cc. The only external
header I use is stdio.h so it must be somehow connected.
Any help
anyone could offer would be greatly appreciated.
Regards,
Peter
Peter Mills
Maverick scientist and software developer
http://sourceforge.net/users/peteysoft/
-Innovative, original and efficient numerical algorithms
http://libagf.sourceforge.net/
-Fast, simple and accurate statistical classification.
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