Originally posted by: LuisdelaTorre

I've got some code that works in Windows in C++ just fine, and when I tried to compile it on my department's linux server, I'm getting errors I don't recognize. I'm thinking it might be related to my makefile (I'm not too experienced in making them). Below I've posted the Makefile, the error I'm getting, and the code that gives me the error. Any help is appreciated. Thanks.

SYSTEM     = x86-64_debian4.0_4.1
LIBFORMAT  = static_pic
 
#------------------------------------------------------------
#
# When you adapt this makefile to compile your CPLEX programs
# please copy this makefile and set CPLEXDIR and CONCERTDIR to
# the directories where CPLEX and CONCERT are installed.
#
#------------------------------------------------------------
 
CPLEXDIR      = /share/apps/cplex/cplex121
CONCERTDIR    = /share/apps/cplex/concert29
# ---------------------------------------------------------------------
# Compiler selection 
# ---------------------------------------------------------------------
 
CCC = g++
 
# ---------------------------------------------------------------------
# Compiler options 
# ---------------------------------------------------------------------
 
CCOPT = -m64 -O -fPIC -fexceptions -DNDEBUG -DIL_STD
 
# ---------------------------------------------------------------------
# Link options and libraries
# ---------------------------------------------------------------------
 
CPLEXBINDIR   = $(CPLEXDIR)/bin/$(BINDIST)
CPLEXJARDIR   = $(CPLEXDIR)/lib/cplex.jar
CPLEXLIBDIR   = $(CPLEXDIR)/lib/$(SYSTEM)/$(LIBFORMAT)
CONCERTLIBDIR = $(CONCERTDIR)/lib/$(SYSTEM)/$(LIBFORMAT)
 
CCLNFLAGS = -L$(CPLEXLIBDIR) -lilocplex -lcplex -L$(CONCERTLIBDIR) -lconcert -lm -pthread
CLNFLAGS  = -L$(CPLEXLIBDIR) -lcplex -lm -pthread
 
 
all:
        make all_cpp
 
CONCERTINCDIR = $(CONCERTDIR)/include
CPLEXINCDIR   = $(CPLEXDIR)/include
 
CCFLAGS = $(CCOPT) -I$(CPLEXINCDIR) -I$(CONCERTINCDIR) 
 
#------------------------------------------------------------
#  make all      : to compile the examples. 
#  make execute  : to compile and execute the examples.
#------------------------------------------------------------
 
 
 
all_cpp: SAATest
 
SAATest: main.o
        g++ main.o -o SAATest
 
main.o: main.cpp
        g++ $(CCFLAGS) main.cpp
 
# ------------------------------------------------------------
 
clean:
        rm *o SAATest
 
# ------------------------------------------------------------

[luisdlt@euler SAATest]$ make all
make all_cpp
make[1]: Entering directory `/home/luisdlt/SAATest'
g++ -m64 -O -fPIC -fexceptions -DNDEBUG -DIL_STD -I/share/apps/cplex/cplex121/include -I/share/apps/cplex/concert29/include  main.cpp
/tmp/cc8Q0RNV.o: In function `main':
main.cpp:(.text+0x70): undefined reference to `IloEnv::IloEnv()'
collect2: ld returned 1 exit status
make[1]: *** [main.o] Error 1
make[1]: Leaving directory `/home/luisdlt/SAATest'
make: *** [all] Error 2

#include <ilcplex/ilocplex.h>
 
ILOSTLBEGIN
 
 
int main() {
  IloEnv env;
  return 0;
}

#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Your Makefile is wrong. First of all, the target for building the object file is missing a '-c' flag. It should look like this:

main.o: main.cpp
        g++ $(CCFLAGS) -c main.cpp

I usually prefer the more general form:

%.o: %.cpp
        g++ $(CCFLAGS) -c -o $@ $<

this way you don't have to write a separate rule for each source file.

The second problem are the missing linker flags for the rule that builds the executable. This should look like that:

SAATest: main.o
        g++ main.o -o SAATest $(CCLNFLAGS)

#CPLEXOptimizers
#DecisionOptimization