Compiler Errors for a MEX file using the CPLEX C API
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I'm currently writing a MEX file that uses the CPLEX API in C to solve linear programming problems. Unfortunately, I run into a "symbol(s) not found for architecture x86_64" problem when I attempt to compile. I am including a verbose error report below.
Some more information:
- I can compile yprime.c - I am using MATLAB 2011b on Mac OSX 10.7.2 - I am compiling with GCC 4.2 included in XCode 4.2. - I already applied the XCode patch in (<http://www.mathworks.com/support/solutions/en/data/1-FR6LXJ/>)
I would greatly appreciate any advice you might have!
-> mexopts.sh sourced from directory (DIR = $PREF_DIR)
FILE = /Users/berk/.matlab/R2011b/mexopts.sh
----------------------------------------------------------------
-> MATLAB = /Applications/MATLAB_R2011b.app
-> CC = llvm-gcc-4.2
-> CC flags:
CFLAGS = -fno-common -no-cpp-precomp -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -fexceptions -Wall
CDEBUGFLAGS = -g
COPTIMFLAGS = -O2 -DNDEBUG
CLIBS = -L/Applications/MATLAB_R2011b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
arguments = -DMX_COMPAT_32
-> CXX = llvm-g++-4.2
-> CXX flags:
CXXFLAGS = -fno-common -no-cpp-precomp -fexceptions -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5
CXXDEBUGFLAGS = -g
CXXOPTIMFLAGS = -O2 -DNDEBUG
CXXLIBS = -L/Applications/MATLAB_R2011b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
arguments = -DMX_COMPAT_32
-> FC = gfortran
-> FC flags:
FFLAGS = -fexceptions -m64 -fbackslash
FDEBUGFLAGS = -g
FOPTIMFLAGS = -O
FLIBS = -L/Applications/MATLAB_R2011b.app/bin/maci64 -lmx -lmex -lmat -L -lgfortran -L -lgfortranbegin
arguments = -DMX_COMPAT_32
-> LD = llvm-gcc-4.2
-> Link flags:
LDFLAGS = -Wl,-twolevel_namespace -undefined error -arch x86_64 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -bundle -Wl,-exported_symbols_list,/Applications/MATLAB_R2011b.app/extern/lib/maci64/mexFunction.map
LDDEBUGFLAGS = -g
LDOPTIMFLAGS = -O
LDEXTENSION = .mexmaci64
arguments =
-> LDCXX =
-> Link flags:
LDCXXFLAGS =
LDCXXDEBUGFLAGS =
LDCXXOPTIMFLAGS =
LDCXXEXTENSION =
arguments =
----------------------------------------------------------------
-> llvm-gcc-4.2 -c -I/Users/berk/Applications/IBM/ILOG/CPLEX_Studio_Academic123/cplex/include/ilcplex/ -I/Applications/MATLAB_R2011b.app/extern/include -I/Applications/MATLAB_R2011b.app/simulink/include -DMATLAB_MEX_FILE -fno-common -no-cpp-precomp -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -fexceptions -Wall -DMX_COMPAT_32 -O2 -DNDEBUG "addcutsmx.c"
addcutsmx.c:488:4: warning: "/*" within comment
addcutsmx.c:37: warning: 'free_and_null' declared 'static' but never defined
addcutsmx.c:38: warning: 'usage' declared 'static' but never defined
-> llvm-gcc-4.2 -O -Wl,-twolevel_namespace -undefined error -arch x86_64 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.6.sdk -mmacosx-version-min=10.5 -bundle -Wl,-exported_symbols_list,/Applications/MATLAB_R2011b.app/extern/lib/maci64/mexFunction.map -o "addcutsmx.mexmaci64" addcutsmx.o -L/Applications/MATLAB_R2011b.app/bin/maci64 -lmx -lmex -lmat -lstdc++
Undefined symbols for architecture x86_64:
"_CPXLopenCPLEX", referenced from:
_mexFunction in addcutsmx.o
"_CPXLcreateprob", referenced from:
_mexFunction in addcutsmx.o
"_CPXLchgobjsen", referenced from:
_mexFunction in addcutsmx.o
"_CPXLnewcols", referenced from:
_mexFunction in addcutsmx.o
"_CPXLaddrows", referenced from:
_mexFunction in addcutsmx.o
"_CPXLlpopt", referenced from:
_mexFunction in addcutsmx.o
"_CPXLsolution", referenced from:
_mexFunction in addcutsmx.o
"_CPXLgetbase", referenced from:
_mexFunction in addcutsmx.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
mex: link of ' "addcutsmx.mexmaci64"' failed.
Error using mex (line 206)
Unable to complete successfully.
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Accepted Answer
Ken Atwell
on 30 Mar 2012
It looks like MEX can't find the CPLEX libraries. Try adding:
-L<path/to/cplex/libs> -l<name_of_library>
when you invoke MEX.
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