I wrote a minimal working example as below:
================================
// test_judy.cpp
#include "mex.h"
#include "matrix.h"
#include <Judy.h>
void test_judy(Pvoid_t p_judy_map)
{
unsigned long index = 0L;
int judy_rv;
JError_t JErr;
judy_rv = Judy1Test(p_judy_map, index, &JErr);
return;
}
void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
int idx=0;
double* p_mapped_samples=NULL;
Pvoid_t PJ1Array = (Pvoid_t) NULL;
test_judy(PJ1Array);
/* create output variable */
plhs[0] = mxCreateDoubleMatrix(3, 1, mxREAL);
if(plhs[0]==NULL){
mexErrMsgTxt("could not create output matrix");
}
p_mapped_samples = mxGetPr(plhs[0]);
for(idx=0; idx<3; idx++){
p_mapped_samples[idx] = 1;
}
return;
}
================================
I tried to compile and link it with the following command:
================================
mex -g -v -lJudy test_judy.cpp
================================
But it gives me the following error:
================================
mex -g -v -lJudy test_judy.cpp
-> mexopts.sh sourced from directory (DIR = $HOME/.matlab/$REL_VERSION)
FILE = /home/wfeng/.matlab/R2007b/mexopts.sh
----------------------------------------------------------------
-> MATLAB = /usr/local/matlab2007b
-> CC = gcc
-> CC flags:
CFLAGS = -ansi -D_GNU_SOURCE -fexceptions -fPIC
-fno-omit-frame-pointer -pthread
CDEBUGFLAGS = -g
COPTIMFLAGS = -O -DNDEBUG
CLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm -lstdc++
arguments = -DMX_COMPAT_32
-> CXX = g++
-> CXX flags:
CXXFLAGS = -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer
-pthread
CXXDEBUGFLAGS = -g
CXXOPTIMFLAGS = -O -DNDEBUG
CXXLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
arguments = -DMX_COMPAT_32
-> FC = g95
-> FC flags:
FFLAGS = -fexceptions -fPIC -fno-omit-frame-pointer
FDEBUGFLAGS = -g
FOPTIMFLAGS = -O
FLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
arguments = -DMX_COMPAT_32
-> LD = g++
-> Link flags:
LDFLAGS = -pthread -shared
-Wl,--version-script,/usr/local/matlab2007b/extern/lib/glnxa64/mexFunction.map
-Wl,--no-undefined
LDDEBUGFLAGS = -g
LDOPTIMFLAGS = -O
LDEXTENSION = .mexa64
arguments = -lJudy
-> LDCXX =
-> Link flags:
LDCXXFLAGS =
LDCXXDEBUGFLAGS =
LDCXXOPTIMFLAGS =
LDCXXEXTENSION =
arguments = -lJudy
----------------------------------------------------------------
-> g++ -c -I/usr/local/matlab2007b/extern/include
-I/usr/local/matlab2007b/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE
-fPIC -fno-omit-frame-pointer -pthread -DMX_COMPAT_32 -g test_judy.cpp
-> gcc -c -I/usr/local/matlab2007b/extern/include
-I/usr/local/matlab2007b/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE
-fexceptions -fPIC -fno-omit-frame-pointer -pthread -DMX_COMPAT_32 -g
/usr/local/matlab2007b/extern/src/mexversion.c
-> g++ -g -pthread -shared
-Wl,--version-script,/usr/local/matlab2007b/extern/lib/glnxa64/mexFunction.map
-Wl,--no-undefined -o test_judy.mexa64 test_judy.o mexversion.o -lJudy
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
/usr/bin/ld:
/usr/lib/gcc/x86_64-linux-gnu/4.0.3/../../../../lib64/libJudy.a(Judy1Test.o):
relocation R_X86_64_32S against `a local symbol' can not be used when making a
shared object; recompile with -fPIC
/usr/lib/gcc/x86_64-linux-gnu/4.0.3/../../../../lib64/libJudy.a: could not read
symbols: Bad value
collect2: ld returned 1 exit status
mex: link of 'test_judy.mexa64' failed.
??? Error using ==> mex at 208
Unable to complete successfully.
================================
As Alan pointed out, the -shared option could have something to do with it. So
I went in and edited the file /home/wfeng/.matlab/R2007b/mexopts.sh by deleting
the -shared option. The following is the result:
================================
mex -g -v -lJudy test_judy.cpp
-> mexopts.sh sourced from directory (DIR = $HOME/.matlab/$REL_VERSION)
FILE = /home/wfeng/.matlab/R2007b/mexopts.sh
----------------------------------------------------------------
-> MATLAB = /usr/local/matlab2007b
-> CC = gcc
-> CC flags:
CFLAGS = -ansi -D_GNU_SOURCE -fexceptions -fPIC
-fno-omit-frame-pointer -pthread
CDEBUGFLAGS = -g
COPTIMFLAGS = -O -DNDEBUG
CLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm -lstdc++
arguments = -DMX_COMPAT_32
-> CXX = g++
-> CXX flags:
CXXFLAGS = -ansi -D_GNU_SOURCE -fPIC -fno-omit-frame-pointer
-pthread
CXXDEBUGFLAGS = -g
CXXOPTIMFLAGS = -O -DNDEBUG
CXXLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
arguments = -DMX_COMPAT_32
-> FC = g95
-> FC flags:
FFLAGS = -fexceptions -fPIC -fno-omit-frame-pointer
FDEBUGFLAGS = -g
FOPTIMFLAGS = -O
FLIBS =
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
arguments = -DMX_COMPAT_32
-> LD = g++
-> Link flags:
LDFLAGS = -pthread
-Wl,--version-script,/usr/local/matlab2007b/extern/lib/glnxa64/mexFunction.map
-Wl,--no-undefined
LDDEBUGFLAGS = -g
LDOPTIMFLAGS = -O
LDEXTENSION = .mexa64
arguments = -lJudy
-> LDCXX =
-> Link flags:
LDCXXFLAGS =
LDCXXDEBUGFLAGS =
LDCXXOPTIMFLAGS =
LDCXXEXTENSION =
arguments = -lJudy
----------------------------------------------------------------
-> g++ -c -I/usr/local/matlab2007b/extern/include
-I/usr/local/matlab2007b/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE
-fPIC -fno-omit-frame-pointer -pthread -DMX_COMPAT_32 -g test_judy.cpp
-> gcc -c -I/usr/local/matlab2007b/extern/include
-I/usr/local/matlab2007b/simulink/include -DMATLAB_MEX_FILE -ansi -D_GNU_SOURCE
-fexceptions -fPIC -fno-omit-frame-pointer -pthread -DMX_COMPAT_32 -g
/usr/local/matlab2007b/extern/src/mexversion.c
-> g++ -g -pthread
-Wl,--version-script,/usr/local/matlab2007b/extern/lib/glnxa64/mexFunction.map
-Wl,--no-undefined -o test_judy.mexa64 test_judy.o mexversion.o -lJudy
-Wl,-rpath-link,/usr/local/matlab2007b/bin/glnxa64
-L/usr/local/matlab2007b/bin/glnxa64 -lmx -lmex -lmat -lm -lm
/usr/lib/gcc/x86_64-linux-gnu/4.0.3/../../../../lib64/crt1.o: In function
`_start':../sysdeps/x86_64/elf/start.S:109: undefined reference to `main'
collect2: ld returned 1 exit status
mex: link of 'test_judy.mexa64' failed.
??? Error using ==> mex at 208
Unable to complete successfully.
=========================================
I also tried to use gcc instead of g++ by renaming my file to .c. But it gave
me the same errors.
Any ideas how I could fix this problem?
Best Regards,
Wei
>>> Troy Heber <[email protected]> 9/18/2009 10:55 AM >>>
On 09/18/09 10:40, Wei Feng wrote:
> BTW, when I said I did not intentionally specify -shared option, I mean I did
> not type in the g++ command. It was generated by the mex command that I used:
> ===================
> mex -g -v -largeArrayDims -I/usr/include -L/usr/lib -lJudy
> mex_test_cir_map_target.cpp ...
> ===================
With out a copy of your code it is hard to guess. I have attached a
copy of the Judy1LCheck.c file from the Judy source. Can you compile
this as a simple test using:
gcc -o Judy1LCheck Judy1LCheck.c -lJudy -lm
You should then be able to run the resulting binary "Judy1LCheck".
Please let us know the results from this simple test.
Thanks,
Troy
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