Custom build not working with CPLEX and .NET

[alexandredias3d]

What version of OR-Tools and what language are you using?
Version: v9.5 (92eab40)
Language: C#

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

What operating system (Linux, Windows, ...) and version?
Windows 11

What did you do?
Steps to reproduce the behavior:

1. Clone https://github.com/google/or-tools.
2. Change FindCPLEX.cmake to update CPLEX version to 20.10.

diff --git a/cmake/FindCPLEX.cmake b/cmake/FindCPLEX.cmake
index b47cc8556a..82fe089bb2 100644
--- a/cmake/FindCPLEX.cmake
+++ b/cmake/FindCPLEX.cmake
@@ -85,7 +85,7 @@ if(CPLEX_FOUND AND NOT TARGET CPLEX::CPLEX)
       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")
+      IMPORTED_LOCATION "${CPLEX_ROOT}/cplex/lib/x64_windows_msvc14/stat_mda/cplex2010.lib")
   else()
     message(FATAL_ERROR "CPLEX not supported for ${CMAKE_SYSTEM}")
   endif()

3 Configure.

cmake -S. -Bbuild -G "Visual Studio 17 2022" -A x64  
            -DCMAKE_BUILD_TYPE=Release 
            -DBUILD_DEPS=ON 
            -DBUILD_DOTNET=ON 
            -DBUILD_SAMPLES=ON 
            -DBUILD_EXAMPLES=ON 
            -DUSE_SCIP=ON 
            -DUSE_XPRESS=ON 
            -DXPRESS_ROOT="C://tool/xpress/xpress900" 
            -DUSE_CPLEX=ON -DCPLEX_ROOT="C://Program Files/IBM/ILOG/CPLEX_Studio201"

4. Build.

cmake --build build --config Release --target ALL_BUILD  

5. Added the OR-Tools packages (generated at or-tools\build\dotnet\packages ) to my project.

What did you expect to see
Correct initialization of the solver using the CPLEX backend.

What did you see instead?

WARNING: Logging before InitGoogleLogging() is written to STDERR
W0223 08:02:05.859726  4572 linear_solver.cc:645] Support for CPLEX not linked in, or the license was not found.

Anything else we should know about your project / environment
It seems that CPLEX support was built correctly since this test works:

I0221 13:09:36.278439 10628 linear_programming.cc:31] ---- Linear programming example with CPLEX_LP ----
I0221 13:09:36.279101 10628 linear_programming.cc:78] Number of variables = 3
I0221 13:09:36.279178 10628 linear_programming.cc:79] Number of constraints = 3
I0221 13:09:36.295479 10628 linear_programming.cc:88] Problem solved in 17 milliseconds
I0221 13:09:36.295574 10628 linear_programming.cc:91] Optimal objective value = 733.333
I0221 13:09:36.295615 10628 linear_programming.cc:94] x1 = 33.3333
I0221 13:09:36.295644 10628 linear_programming.cc:95] x2 = 66.6667
I0221 13:09:36.295673 10628 linear_programming.cc:96] x3 = 0
I0221 13:09:36.295704 10628 linear_programming.cc:98] Advanced usage:
I0221 13:09:36.295729 10628 linear_programming.cc:99] Problem solved in 2 iterations
I0221 13:09:36.296060 10628 linear_programming.cc:100] x1: reduced cost = 0
I0221 13:09:36.296100 10628 linear_programming.cc:101] x2: reduced cost = 0
I0221 13:09:36.296118 10628 linear_programming.cc:102] x3: reduced cost = -2.66667
I0221 13:09:36.296135 10628 linear_programming.cc:104] c0: dual value = 3.33333 activity = 100
I0221 13:09:36.296154 10628 linear_programming.cc:106] c1: dual value = 0.666667 activity = 600
I0221 13:09:36.296172 10628 linear_programming.cc:108] c2: dual value = -0 activity = 200

Also, I can confirm that I am using the custom dotnet package because Xpress works normally.

WARNING: Logging before InitGoogleLogging() is written to STDERR
W0223 08:12:37.446219 29332 xpress_interface.cc:287] XpressInterface : Initialising xpress-MP with parameter C:\tool\xpress\xpress900
W0223 08:12:37.893987 29332 xpress_interface.cc:297] XpressInterface : Xpress banner :
FICO Xpress Solver 64bit v9.0.0 Oct 17 2022
(c) Copyright Fair Isaac Corporation 1983-2022. All rights reserved

This is possible a duplicate of #3475, but I could not find the solution to the problem.

[lperron]

We do not support cplex ourselves. So I will move this to discussions/linear solver. PR welcomes.