From bb57cb80eb7d9ab779d19112f2da65c60bd37f39 Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@gmail.com>
Date: Sat, 27 Oct 2018 16:49:17 +0200
Subject: UseSWIG: multiple input files must be supported in version 2

Fixes: #18506
---
 Modules/UseSWIG.cmake                    | 11 +++++++++--
 Modules/UseSWIG/ManageSupportFiles.cmake | 31 +++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 Modules/UseSWIG/ManageSupportFiles.cmake

diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index f20a53b..31395d9 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -234,6 +234,8 @@ set(SWIG_PYTHON_EXTRA_FILE_EXTENSIONS ".py")
 set(SWIG_JAVA_EXTRA_FILE_EXTENSIONS ".java" "JNI.java")
 set(SWIG_CSHARP_EXTRA_FILE_EXTENSIONS ".cs" "PINVOKE.cs")
 
+set(SWIG_MANAGE_SUPPORT_FILES_SCRIPT "${CMAKE_CURRENT_LIST_DIR}/UseSWIG/ManageSupportFiles.cmake")
+
 ##
 ## PRIVATE functions
 ##
@@ -444,9 +446,13 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   if (UseSWIG_MODULE_VERSION VERSION_GREATER 1)
     # as part of custom command, start by removing old generated files
     # to ensure obsolete files do not stay
-    set (swig_cleanup_command COMMAND "${CMAKE_COMMAND}" -E remove_directory "${outdir}")
+    set (swig_file_outdir "${workingdir}/${swig_source_file_name_we}.files")
+    set (swig_cleanup_command COMMAND "${CMAKE_COMMAND}" "-DSUPPORT_FILES_WORKING_DIRECTORY=${swig_file_outdir}" "-DSUPPORT_FILES_OUTPUT_DIRECTORY=${outdir}" -DACTION=CLEAN -P "${SWIG_MANAGE_SUPPORT_FILES_SCRIPT}")
+    set (swig_copy_command COMMAND "${CMAKE_COMMAND}" "-DSUPPORT_FILES_WORKING_DIRECTORY=${swig_file_outdir}" "-DSUPPORT_FILES_OUTPUT_DIRECTORY=${outdir}" -DACTION=COPY -P "${SWIG_MANAGE_SUPPORT_FILES_SCRIPT}")
   else()
+    set (swig_file_outdir "${outdir}")
     unset (swig_cleanup_command)
+    unset (swig_copy_command)
   endif()
 
   # IMPLICIT_DEPENDS below can not handle situations where a dependent file is
@@ -476,12 +482,13 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
     COMMAND "${CMAKE_COMMAND}" -E env "SWIG_LIB=${SWIG_DIR}" "${SWIG_EXECUTABLE}"
     "-${SWIG_MODULE_${name}_SWIG_LANGUAGE_FLAG}"
     "${swig_source_file_flags}"
-    -outdir "${outdir}"
+    -outdir "${swig_file_outdir}"
     ${swig_special_flags}
     ${swig_extra_flags}
     "${swig_include_dirs}"
     -o "${swig_generated_file_fullname}"
     "${swig_source_file_fullname}"
+    ${swig_copy_command}
     MAIN_DEPENDENCY "${swig_source_file_fullname}"
     DEPENDS ${swig_dependencies}
     IMPLICIT_DEPENDS CXX "${swig_source_file_fullname}"
diff --git a/Modules/UseSWIG/ManageSupportFiles.cmake b/Modules/UseSWIG/ManageSupportFiles.cmake
new file mode 100644
index 0000000..4a03900
--- /dev/null
+++ b/Modules/UseSWIG/ManageSupportFiles.cmake
@@ -0,0 +1,31 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+
+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}/*")
+
+  if (files)
+    # clean-up the output directory
+    ## compute full paths
+    list (TRANSFORM files PREPEND "${SUPPORT_FILES_OUTPUT_DIRECTORY}/")
+    ## remove generated files from the output directory
+    file (REMOVE ${files})
+
+    # clean-up working directory
+    file (REMOVE_RECURSE "${SUPPORT_FILES_WORKING_DIRECTORY}")
+  endif()
+
+  file (MAKE_DIRECTORY "${SUPPORT_FILES_WORKING_DIRECTORY}")
+endif()
+
+if (ACTION STREQUAL "COPY")
+  # Collect current list of generated files
+  file (GLOB files LIST_DIRECTORIES FALSE "${SUPPORT_FILES_WORKING_DIRECTORY}/*")
+
+  if (files)
+    # copy files to the output directory
+    file (COPY ${files} DESTINATION "${SUPPORT_FILES_OUTPUT_DIRECTORY}")
+  endif()
+endif()
-- 
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