UseSWIG: Take care of support files in sub-directories

Fixes: #20833

Modules/UseSWIG/ManageSupportFiles.cmake

@@ -4,7 +4,7 @@
 
 if (ACTION STREQUAL "CLEAN")
   # Collect current list of generated files
-  file (GLOB files LIST_DIRECTORIES FALSE RELATIVE "${SUPPORT_FILES_WORKING_DIRECTORY}" "${SUPPORT_FILES_WORKING_DIRECTORY}/*")
+  file (GLOB_RECURSE files LIST_DIRECTORIES TRUE RELATIVE "${SUPPORT_FILES_WORKING_DIRECTORY}" "${SUPPORT_FILES_WORKING_DIRECTORY}/*")
 
   if (files)
     # clean-up the output directory
@@ -22,7 +22,7 @@ endif()
 
 if (ACTION STREQUAL "COPY")
   # Collect current list of generated files
-  file (GLOB files LIST_DIRECTORIES FALSE "${SUPPORT_FILES_WORKING_DIRECTORY}/*")
+  file (GLOB files LIST_DIRECTORIES TRUE "${SUPPORT_FILES_WORKING_DIRECTORY}/*")
 
   if (files)
     # copy files to the output directory

Tests/UseSWIG/CMakeLists.txt

@@ -33,6 +33,16 @@ if (CMAKE_CSharp_COMPILER)
     --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
     )
 endif()
+add_test(NAME UseSWIG.NamespaceCsharp COMMAND
+  ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>
+  --build-and-test
+  "${CMake_SOURCE_DIR}/Tests/UseSWIG/NamespaceCsharp"
+  "${CMake_BINARY_DIR}/Tests/UseSWIG/NamespaceCsharp"
+  ${build_generator_args}
+  --build-project TestNamespaceCsharp
+  --build-options ${build_options}
+  --test-command ${CMAKE_CTEST_COMMAND} -V -C $<CONFIGURATION>
+  )
 
 add_test(NAME UseSWIG.BasicPython COMMAND
   ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION>

Tests/UseSWIG/NamespaceCsharp/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.12...3.13)
+
+project(TestNamsespaceCsharp CXX)
+
+include(CTest)
+
+find_package(SWIG REQUIRED)
+include(${SWIG_USE_FILE})
+
+set(UseSWIG_MODULE_VERSION 2)
+
+
+add_library(ns_example STATIC ns_example.cpp)
+target_include_directories(ns_example PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")
+
+set_property(SOURCE ns_example.i PROPERTY CPLUSPLUS ON)
+
+swig_add_library(ns_csharp TYPE SHARED LANGUAGE csharp SOURCES ns_example.i)
+set_target_properties(ns_csharp PROPERTIES SWIG_USE_TARGET_INCLUDE_DIRECTORIES TRUE)
+
+target_link_libraries(ns_csharp PRIVATE ns_example)
+
+get_target_property(NS_CSHARP_SUPPORT_FILES_DIR ns_csharp SWIG_SUPPORT_FILES_DIRECTORY)
+
+add_test(NAME NamespaceCsharp COMMAND "${CMAKE_COMMAND}" "-DSUPPORT_FILES_DIRECTORY=${NS_CSHARP_SUPPORT_FILES_DIR}" -P "${CMAKE_CURRENT_SOURCE_DIR}/ValidateSupportFiles.cmake")

Tests/UseSWIG/NamespaceCsharp/ValidateSupportFiles.cmake

@@ -0,0 +1,8 @@
+
+file (GLOB_RECURSE files LIST_DIRECTORIES TRUE RELATIVE "${SUPPORT_FILES_DIRECTORY}" "${SUPPORT_FILES_DIRECTORY}/*")
+
+list(SORT files)
+
+if (NOT files STREQUAL "NSExample.cs;NSExamplePINVOKE.cs;ns;ns/my_class_in_namespace.cs")
+  message (FATAL_ERROR "Support files not correctly collected.")
+endif()

Tests/UseSWIG/NamespaceCsharp/ns_example.cpp

@@ -0,0 +1,14 @@
+#include "ns_example.hpp"
+
+namespace ns {
+
+void my_class_in_namespace::add(int value)
+{
+  Sum += value;
+}
+
+int my_class_in_namespace::get_sum() const
+{
+  return Sum;
+}
+}

Tests/UseSWIG/NamespaceCsharp/ns_example.hpp

@@ -0,0 +1,19 @@
+#pragma once
+
+namespace ns {
+
+class my_class_in_namespace
+{
+public:
+  my_class_in_namespace()
+    : Sum(0)
+  {
+  }
+
+  void add(int value);
+  int get_sum() const;
+
+private:
+  int Sum;
+};
+}

Tests/UseSWIG/NamespaceCsharp/ns_example.i

@@ -0,0 +1,8 @@
+%module NSExample
+
+%{
+#include "ns_example.hpp"
+%}
+
+%nspace ns::my_class_in_namespace;
+%include "ns_example.hpp"