FindCPLEX.cmake definition of IL_STD and other libraries

[TryerGit]

Hello,

I am looking at the repository provided FindCPLEX.cmake file available at:

https://github.com/google/or-tools/blob/stable/cmake/FindCPLEX.cmake

I notice that this file refers to the following CPLEX documentation:

https://www.ibm.com/docs/en/icos/12.10.0?topic=cplex-setting-up-gnulinuxmacos

The CPLEX documentation requires one to define IL_STD, and also specification of libraries: -lcplex -lm -lpthread during linking.

Contrasting this repository's FindCPLEX.cmake with the one found at AMPL https://github.com/ampl/mp/blob/master/support/cmake/FindCPLEX.cmake

I notice that the latter too does not specify the libraries -lcplex -lm -lpthread but does define -DIL_STD

I have been able to compile my CPLEX project using the FindCPLEX.cmake file provided at this repository. I am obtaining a bunch of linking errors possibly because the libaries and IL_STD are not defined. Could you please let me know if there is a working CPLEX example that makes use of FindCPLEX.cmake in the repository?

I am new to CMAKE. I used raw make before and I used to compile and link to CPLEX thus:

# Link Libraries and Options
LDLIBSOPTIONS=-L /opt/ibm/ILOG/CPLEX_Studio1210/cplex/lib/x86-64_linux/static_pic

${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/linux: ${OBJECTFILES}
	${MKDIR} -p ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}
	${LINK.cc} -o ${CND_DISTDIR}/${CND_CONF}/${CND_PLATFORM}/linux ${OBJECTFILES} ${LDLIBSOPTIONS} -lcplex -lm -lpthread -ldl -lppl -lgmp -lgmpxx

${OBJECTDIR}/_ext/ce8a225a/userfile.o: ../../../userfile.cpp
	${MKDIR} -p ${OBJECTDIR}/_ext/ce8a225a
	${RM} "[email protected]"
	$(COMPILE.cc) -O2 -DIL_STD -DNDEBUG -I/opt/ibm/ILOG/CPLEX_Studio1210/cplex/include -I../include -std=c++14 -MMD -MP -MF "[email protected]" -o ${OBJECTDIR}/_ext/ce8a225a/userfile.o ../../../userfile.cpp

I am new to CMake and in order to use ORTools, I am slowly transitioning to CMake and hence this question. While I know that your repository does not support CPLEX (?) as it does Gurobi and SCIP, could you please suggest what changes I should make in my CMakeLists.txt file to get CPLEX to work alongside the FindCPLEX.cmake file you have provided?

Thank you.