dotnet with CPLEX: not linked or license not found

[jose-joaquim]

What version of OR-Tools and what language are you using?
Version: stable/v9.4
Language: C#

Which solver are you using (e.g. CP-SAT, Routing Solver, GLOP, BOP, Gurobi)

CPLEX 20.10

What operating system (Linux, Windows, ...) and version?

Windows 11

What did you do?

Right after cloning the repository:

1. Changed Makefile.cpp.mk adding USE_CPLEX ?= ON and providing the -DCPLEX_ROOT option in the third_party target recipe.
2. Executed: tools\make third_party
3. Executed then: tools\make dotnet
4. Created a console application project from scratch in VS 2022.
5. Installed the two nuget packages located in the .\or-tools\build_make\dotnet\packages into my project.

What did you expect to see

Execute with success the simple MIP example.

What did you see instead?

An error. The console outputs:

WARNING: Logging before InitGoogleLogging() is written to STDERR
W0926 16:52:33.024684 30456 linear_solver.cc:625] Support for cplex not linked in, or the license was not found.

Anything else we should know about your project / environment

I thought that this could be an error involving not supported CPLEX versions. After seeing this answer, I changed the FindCPLEX.cmake file right after the elseif(MSVC) line to:

set_target_properties(CPLEX::CPLEX PROPERTIES IMPORTED_LOCATION "${CPLEX_ROOT}/cplex/lib/x64_windows_msvc14/stat_mda/cplex2010.lib")

which was somehow cplex12100.lib before.

[lperron]

Can you check it does not uses the package from nuget ?

[jose-joaquim]

Can you check it does not uses the package from nuget ?

Thanks for the reply.

I'm using the nuget packages generated from the compilation process.
Besides, I updated the section "What did you do" with steps 4. and 5. I hope this clarifies!

PS: a friend of mine reproduced steps 4. and 5. in his computer, with the .nupkgs generated in my local, and it worked with CPLEX 12.7!

[Mizux]

@jjaneto in your cplex install dir what is the name of the "cplex*.lib" (and its relative location from the cplex root dir installation) ?

ps: 12100 stand for 12.10.0 IIRC which is the new cplex naming convention for their lib

note: PR welcome to have a more versatile cplex find package
aka make this work with wild character aka cplex*.lib

or-tools/cmake/FindCPLEX.cmake

Lines 76 to 87 in e8a854d

	if(APPLE) # be aware that `UNIX` is `TRUE` on OS X, so this check must be first
	set_target_properties(CPLEX::CPLEX PROPERTIES
	IMPORTED_LOCATION "${CPLEX_ROOT}/cplex/lib/x86-64_osx/static_pic/libcplex.a")
	elseif(UNIX)
	set_target_properties(CPLEX::CPLEX PROPERTIES
	IMPORTED_LOCATION "${CPLEX_ROOT}/cplex/lib/x86-64_linux/static_pic/libcplex.a")
	elseif(MSVC)
	set_target_properties(CPLEX::CPLEX PROPERTIES
	IMPORTED_LOCATION "${CPLEX_ROOT}/cplex/lib/x64_windows_msvc14/stat_mda/cplex12100.lib")
	else()
	message(FATAL_ERROR "CPLEX not supported for ${CMAKE_SYSTEM}")
	endif()

[jose-joaquim]

@Mizux the name of the lib is cplex2010.lib; I installed in my local with the default settings. The relative path to this library is IBM\ILOG\CPLEX_Studio201\cplex\lib\cplex2010.lib.

I also checked for any error involving environment variables, but could not find evidences for it.

I reproduced again the steps of the original post, changing the FindCPLEX.cmake file according to your suggestion (editing to cplex*.lib), but the outcome that I got was the same error from before!

[lperron]

Make is deprecated.

Followup

• CMake build instructions (Make is deprecated) #3558