diff --git a/ortools/algorithms/python/CMakeLists.txt b/ortools/algorithms/python/CMakeLists.txt
index 2d290400d0..3b1e9f3e17 100644
--- a/ortools/algorithms/python/CMakeLists.txt
+++ b/ortools/algorithms/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE knapsack_solver.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE knapsack_solver.i PROPERTY SWIG_MODULE_NAME pywrapknapsack_solver)
+set_property(SOURCE knapsack_solver.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(pywrapknapsack_solver
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/constraint_solver/python/CMakeLists.txt b/ortools/constraint_solver/python/CMakeLists.txt
index 26636031b8..8264c7ca42 100644
--- a/ortools/constraint_solver/python/CMakeLists.txt
+++ b/ortools/constraint_solver/python/CMakeLists.txt
@@ -1,7 +1,8 @@
-list(APPEND CMAKE_SWIG_FLAGS "-nofastunpack")
-
 set_property(SOURCE routing.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE routing.i PROPERTY SWIG_MODULE_NAME pywrapcp)
+set_property(SOURCE routing.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
+set_property(SOURCE routing.i PROPERTY COMPILE_OPTIONS -nofastunpack)
 swig_add_library(pywrapcp
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/data/python/CMakeLists.txt b/ortools/data/python/CMakeLists.txt
index 5bc3a9afae..83b3f97daa 100644
--- a/ortools/data/python/CMakeLists.txt
+++ b/ortools/data/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE rcpsp.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE rcpsp.i PROPERTY SWIG_MODULE_NAME pywraprcpsp)
+set_property(SOURCE rcpsp.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(pywraprcpsp
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/graph/python/CMakeLists.txt b/ortools/graph/python/CMakeLists.txt
index 563b5a8cd8..1ac6081e67 100644
--- a/ortools/graph/python/CMakeLists.txt
+++ b/ortools/graph/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE graph.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE graph.i PROPERTY SWIG_MODULE_NAME pywrapgraph)
+set_property(SOURCE graph.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(pywrapgraph
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/linear_solver/python/CMakeLists.txt b/ortools/linear_solver/python/CMakeLists.txt
index 6d06aaae14..02d320b8d2 100644
--- a/ortools/linear_solver/python/CMakeLists.txt
+++ b/ortools/linear_solver/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE linear_solver.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE linear_solver.i PROPERTY SWIG_MODULE_NAME pywraplp)
+set_property(SOURCE linear_solver.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(pywraplp
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/sat/python/CMakeLists.txt b/ortools/sat/python/CMakeLists.txt
index 1305f1cb2e..ffa1ac8757 100644
--- a/ortools/sat/python/CMakeLists.txt
+++ b/ortools/sat/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE sat.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE sat.i PROPERTY SWIG_MODULE_NAME pywrapsat)
+set_property(SOURCE sat.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(pywrapsat
   TYPE SHARED
   LANGUAGE python
diff --git a/ortools/util/python/CMakeLists.txt b/ortools/util/python/CMakeLists.txt
index 596bd70e3f..8a483788e3 100644
--- a/ortools/util/python/CMakeLists.txt
+++ b/ortools/util/python/CMakeLists.txt
@@ -1,5 +1,7 @@
 set_property(SOURCE sorted_interval_list.i PROPERTY CPLUSPLUS ON)
 set_property(SOURCE sorted_interval_list.i PROPERTY SWIG_MODULE_NAME sorted_interval_list)
+set_property(SOURCE sorted_interval_list.i PROPERTY COMPILE_DEFINITIONS
+  ${OR_TOOLS_COMPILE_DEFINITIONS} ABSL_MUST_USE_RESULT)
 swig_add_library(sorted_interval_list
   TYPE SHARED
   LANGUAGE python