Fix

* Re-introduce it in base/ BUILD.bazel
* Add explicit deps in every target using it

ortools/base/BUILD.bazel

@@ -70,7 +70,6 @@ cc_library(
         "commandlineflags.h",
         "init_google.h",
         "stl_logging.h",
-        "string_view_migration.h",
         "types.h",
         "version.h",
     ],
@@ -568,6 +567,12 @@ cc_library(
     deps = [":base"],
 )
 
+cc_library(
+    name = "string_view_migration",
+    hdrs = ["string_view_migration.h"],
+    deps = ["@abseil-cpp//absl/strings"],
+)
+
 cc_library(
     name = "strong_int",
     hdrs = ["strong_int.h"],

ortools/linear_solver/wrappers/BUILD.bazel

@@ -37,6 +37,7 @@ cc_library(
     visibility = ["//visibility:public"],
     deps = [
         "//ortools/base:file",
+        "//ortools/base:string_view_migration",
         "//ortools/linear_solver:linear_solver_cc_proto",
         "//ortools/linear_solver:model_exporter",
         "//ortools/linear_solver:solve_mp_model",

ortools/math_opt/core/BUILD.bazel

@@ -64,6 +64,7 @@ cc_library(
         "//ortools/base:status_macros",
         "//ortools/math_opt:model_cc_proto",
         "//ortools/math_opt:model_update_cc_proto",
+        "//ortools/base:string_view_migration",
         "@abseil-cpp//absl/algorithm:container",
         "@abseil-cpp//absl/container:flat_hash_map",
         "@abseil-cpp//absl/log:check",

ortools/math_opt/cpp/BUILD.bazel

@@ -196,6 +196,7 @@ cc_library(
         ":variable_and_expressions",
         "//ortools/base:protoutil",
         "//ortools/base:status_macros",
+        "//ortools/base:string_view_migration",
         "//ortools/gscip:gscip_cc_proto",
         "//ortools/math_opt:result_cc_proto",
         "//ortools/math_opt:solution_cc_proto",
@@ -386,6 +387,7 @@ cc_library(
     srcs = ["streamable_solver_init_arguments.cc"],
     hdrs = ["streamable_solver_init_arguments.h"],
     deps = [
+        "//ortools/base:string_view_migration",
         "//ortools/math_opt:parameters_cc_proto",
         "//ortools/math_opt/solvers:gurobi_cc_proto",
         "@abseil-cpp//absl/status:statusor",

ortools/math_opt/elemental/BUILD.bazel

@@ -62,6 +62,7 @@ cc_library(
         ":symmetry",
         ":thread_safe_id_map",
         "//ortools/base:status_macros",
+        "//ortools/base:string_view_migration",
         "//ortools/math_opt:model_cc_proto",
         "//ortools/math_opt:model_update_cc_proto",
         "//ortools/math_opt:sparse_containers_cc_proto",

ortools/sat/BUILD.bazel

@@ -33,6 +33,7 @@ cc_library(
         ":model",
         ":sat_parameters_cc_proto",
         "//ortools/util:sorted_interval_list",
+        "//ortools/base:string_view_migration",
         "@abseil-cpp//absl/container:flat_hash_map",
         "@abseil-cpp//absl/log:check",
         "@abseil-cpp//absl/strings",

ortools/sat/python/BUILD.bazel

@@ -89,6 +89,7 @@ pybind_extension(
         ":linear_expr",
         ":linear_expr_doc",
         ":proto_builder_pybind11",
+        "//ortools/base:string_view_migration",
         "//ortools/sat:cp_model_cc_proto",
         "//ortools/sat:cp_model_utils",
         "//ortools/sat:sat_parameters_cc_proto",