Originally posted by: UserCplex

Hello,

I use C API for my development work and thus far I was working on Windows/Visual Studio IDE.

I recently have begun using ubuntu with code::blocks IDE and followed the steps mentioned at http://www-01.ibm.com/support/docview.wss?uid=swg21449771 to setup my cplex project.

However, I am encountering the following errors when I try to build my project. Reproducing the build log from within code::blocks.

g++ -L/opt/ibm/ILOG/CPLEX_Studio128/cplex/lib/x86-64_linux/static_pic -L/opt/ibm/ILOG/CPLEX_Studio128/concert/lib/x86-64_linux/static_pic -o bin/Debug/Test "obj/Debug/research/cplexroutines/main.o"   -lilocplex -lcplex -lconcert -lm -lpthread
/opt/ibm/ILOG/CPLEX_Studio128/cplex/lib/x86-64_linux/static_pic/libcplex.a(mkl_memory_patched.o): In function `mkl_serv_set_memory_limit':
mkl_memory.c:(.text+0x5a9): undefined reference to `dlopen'
mkl_memory.c:(.text+0x5ca): undefined reference to `dlsym'
mkl_memory.c:(.text+0x618): undefined reference to `dlsym'
mkl_memory.c:(.text+0x62e): undefined reference to `dlsym'
mkl_memory.c:(.text+0x644): undefined reference to `dlsym'
mkl_memory.c:(.text+0x739): undefined reference to `dlerror'
mkl_memory.c:(.text+0x78c): undefined reference to `dlopen'
mkl_memory.c:(.text+0x840): undefined reference to `dlopen'
mkl_memory.c:(.text+0x856): undefined reference to `dlerror'
mkl_memory.c:(.text+0x91a): undefined reference to `dlopen'
mkl_memory.c:(.text+0x922): undefined reference to `dlerror'
mkl_memory.c:(.text+0x937): undefined reference to `dlsym'
mkl_memory.c:(.text+0x95a): undefined reference to `dlopen'
mkl_memory.c:(.text+0x962): undefined reference to `dlerror'
mkl_memory.c:(.text+0x972): undefined reference to `dlsym'
mkl_memory.c:(.text+0x98d): undefined reference to `dlerror'
/opt/ibm/ILOG/CPLEX_Studio128/cplex/lib/x86-64_linux/static_pic/libcplex.a(mkl_memory_patched.o): In function `mkl_serv_allocate':
mkl_memory.c:(.text+0x1897): undefined reference to `dlopen'
mkl_memory.c:(.text+0x18b8): undefined reference to `dlsym'
mkl_memory.c:(.text+0x1906): undefined reference to `dlsym'
mkl_memory.c:(.text+0x191c): undefined reference to `dlsym'
mkl_memory.c:(.text+0x1932): undefined reference to `dlsym'
mkl_memory.c:(.text+0x1a27): undefined reference to `dlerror'
mkl_memory.c:(.text+0x1a7a): undefined reference to `dlopen'
mkl_memory.c:(.text+0x1b2e): undefined reference to `dlopen'
mkl_memory.c:(.text+0x1b44): undefined reference to `dlerror'
mkl_memory.c:(.text+0x1c07): undefined reference to `dlopen'
mkl_memory.c:(.text+0x1c0f): undefined reference to `dlerror'
mkl_memory.c:(.text+0x1c24): undefined reference to `dlsym'
mkl_memory.c:(.text+0x1c47): undefined reference to `dlopen'
mkl_memory.c:(.text+0x1c4f): undefined reference to `dlerror'
mkl_memory.c:(.text+0x1c5f): undefined reference to `dlsym'
mkl_memory.c:(.text+0x1c7a): undefined reference to `dlerror'
/opt/ibm/ILOG/CPLEX_Studio128/cplex/lib/x86-64_linux/static_pic/libcplex.a(mkl_memory_patched.o): In function `mkl_serv_malloc':
mkl_memory.c:(.text+0x2296): undefined reference to `dlopen'
mkl_memory.c:(.text+0x22b7): undefined reference to `dlsym'
mkl_memory.c:(.text+0x2305): undefined reference to `dlsym'
mkl_memory.c:(.text+0x231b): undefined reference to `dlsym'
mkl_memory.c:(.text+0x2331): undefined reference to `dlsym'
mkl_memory.c:(.text+0x2426): undefined reference to `dlerror'
mkl_memory.c:(.text+0x2479): undefined reference to `dlopen'
mkl_memory.c:(.text+0x252b): undefined reference to `dlopen'
mkl_memory.c:(.text+0x2541): undefined reference to `dlerror'
mkl_memory.c:(.text+0x2604): undefined reference to `dlopen'
mkl_memory.c:(.text+0x260c): undefined reference to `dlerror'
mkl_memory.c:(.text+0x2621): undefined reference to `dlsym'
mkl_memory.c:(.text+0x2644): undefined reference to `dlopen'
mkl_memory.c:(.text+0x264c): undefined reference to `dlerror'
mkl_memory.c:(.text+0x265c): undefined reference to `dlsym'
mkl_memory.c:(.text+0x2677): undefined reference to `dlerror'
/opt/ibm/ILOG/CPLEX_Studio128/cplex/lib/x86-64_linux/static_pic/libcplex.a(mkl_memory_patched.o): In function `mkl_serv_deallocate':
mkl_memory.c:(.text+0x3825): undefined reference to `dlopen'
mkl_memory.c:(.text+0x3846): undefined reference to `dlsym'
Process terminated with status 1 (0 minute(s), 0 second(s))
50 error(s), 0 warning(s) (0 minute(s), 0 second(s))

Any help as to how to get the settings right will be highly appreciated.

Thanks.

Originally posted by: UserCplex

I think I figured it out. 

-ldl was an option required by the linker. So, added this below the list specified 

ilocplex
cplex
concert
m
pthread

dl

The project compiles and runs now.

Thanks.

Correct, since version 12.8 you also have to link with the dynamic linker library. You can see this in the example makefiles shipped with CPLEX.