Originally posted by: SystemAdmin

Hi,

Recently I downloaded CPLEX 12.4 for Mac OS X. I tried to compile a simple app using clang++ compiler (with c++0x feature and libc++ as STL) and CPLEX libs. The source is the following:

#include <iostream>
#include <vector>
#include <ilcplex/ilocplex.h>

ILOSTLBEGIN

int main()
{ cout << "Instantiating vector<>..." << endl;
vector<int> v;

IloEnv env;

try
{ cout << "Instantiating IloNumArray..." << endl;
IloNumArray a(env);

cout << "Instantiating IloNumArray2..." << endl;
IloNumArray2 rba(env);

cout << "Creating model..." << endl;
IloModel mod(env);
IloCplex cplex(mod);
}

catch (IloException& ex) { cerr << "Error: " << ex << endl; }
catch (...) { cerr << "Error: Unknown exception caught!" << endl; }

env.end();

return 0;
}

The compilation line is:

$ clang++ -g -m64 -fPIC -fexceptions -DNDEBUG -DIL_STD -std=c++0x -stdlib=libc++
-I/Users/Mark/Applications/IBM/ILOG/CPLEX_Studio124/cplex/include
-I/Users/Mark/Applications/IBM/ILOG/CPLEX_Studio124/concert/include
-L/Users/Mark/Applications/IBM/ILOG/CPLEX_Studio124/cplex/lib/x86-64_darwin9_gcc4.0/static_pic
-L/Users/Mark/Applications/IBM/ILOG/CPLEX_Studio124/concert/lib/x86-64_darwin9_gcc4.0/static_pic seg_fault.cpp
-o seg_fault -lcplex -lilocplex -lconcert -lpthread -lstdc++.6 -lm
Then, I run it and I get:

Instantiating vector...
Instantiating IloNumArray...
Instantiating IloNumArray2...
Segmentation fault: 11

So, it seems that it IloNumArray works fine, but it cannot instatiate IloNumArray2.

Any hint??

System info:
Mac OS X Lion 10.7.4
Apple clang++ version 4.0 (based on LLVM 3.1svn)
clang++ language and STL options: -std=c++0x -stdlib=libc++
CPLEX 12.4 libs for x86-64_darwin9_gcc4.0
Thanks in advance
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#DecisionOptimization

Originally posted by: SystemAdmin

I just compiled your code on Linux and it runs without problem there.
Can you please try the following:
1. Go to /Users/Mark/Applications/IBM/ILOG/CPLEX_Studio124/cplex/examples/x86-64_darwin9_gcc4.0/static_pic
2. Type 'make execute_cpp'
3. Pick up the compiler and linker flags that you see when make builds compiles and links the C++ sources.
4. Use the exact same flags with your compilation.
Does this help?
If not, could you provide a backtrace from a debugger?
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Hi,
Thanks for such a quick reply!! I've tried the compilation+linking options but they don't make any better.
Please, note that I'm using clang++ compiler with the c++0x option and their libstd++ STL implementation.
I mean that, if I delete any reference to an STL object (i.e. vector) and then compile without the "-stdlib=libc++" and "-lstdc++.6" options, the program will run OK.

The debugger backtrace is:
(gdb) run
Starting program: /Users/Mark/Developer/_CPLEX_seg_fault_/seg_fault
Reading symbols for shared libraries +......................... done
Instantiating vector...
Instantiating IloNumArray...
Instantiating IloNumArray2...

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
0x00000001007b64bb in IloArrayI::IloArrayI ()
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Sorry, the copy+paste missed the backtrace:

(gdb) backtrace
#0 0x00000001007b64bb in IloArrayI::IloArrayI ()
#1 0x0000000100002381 in IloArray<IloNumArray>::IloArray (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, max=0) at iloenv.h:2161
#2 0x0000000100002303 in IloNumArray2::IloNumArray2 (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, n=0) at iloenv.h:2447
#3 0x0000000100001af5 in IloNumArray2::IloNumArray2 (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, n=0) at iloenv.h:2447
#4 0x000000010000143c in main () at seg_fault.cpp:22
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Sorry, the copy+paste missed the backtrace:

(gdb) backtrace
#0 0x00000001007b64bb in IloArrayI::IloArrayI ()
#1 0x0000000100002381 in IloArray<IloNumArray>::IloArray (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, max=0) at iloenv.h:2161
#2 0x0000000100002303 in IloNumArray2::IloNumArray2 (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, n=0) at iloenv.h:2447
#3 0x0000000100001af5 in IloNumArray2::IloNumArray2 (this=0x7fff5fbff8b8, env={_impl = 0x101801c00}, n=0) at iloenv.h:2447
#4 0x000000010000143c in main () at seg_fault.cpp:22
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#DecisionOptimization

Originally posted by: SystemAdmin

I have double checked the source code and could not find any issue.
The officially supported compiler/runtime environment on MacOS is g++.
So I'm afraid that the problem arises from some incompatibility between the C++ runtime libraries. There is not much you can do other than switching to g++ or not linking with the offending libraries :-(
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#DecisionOptimization

Originally posted by: SystemAdmin

OK, I understand. Actually, if I compile the source without using libc++, it works fine. So, I'll try to switch to g++ for Mac OS.

Thank you very much
#CPLEXOptimizers
#DecisionOptimization