UseSWIG: Add OUTPUT_DIR and OUTFILE_DIR source file properties

These properties enable to manage output directories on
per source file basis.

Fixes: #21250

1 files changed, 42 insertions, 9 deletions

diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index 59a0707..757e539 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -76,8 +76,8 @@ Defines the following command for use with ``SWIG``:
 
   ``OUTFILE_DIR``
     Specify an output directory name where the generated source file will be
-    placed (swig -o option). If not specified, the ``SWIG_OUTFILE_DIR`` variable
-    will be used. If neither is specified, ``OUTPUT_DIR`` or
+    placed (swig ``-o`` option). If not specified, the ``SWIG_OUTFILE_DIR``
+    variable will be used. If neither is specified, ``OUTPUT_DIR`` or
     ``CMAKE_SWIG_OUTDIR`` is used instead.
 
   ``SOURCES``
@@ -156,6 +156,19 @@ ensure generated files will receive the required settings.
     If policy :policy:`CMP0086` is set to ``NEW``, ``-module <module_name>``
     is passed to ``SWIG`` compiler.
 
+``OUTPUT_DIR``
+  Specify where to write the language specific files (swig ``-outdir`` option)
+  for the considered source file. If not specified, the other ways to define
+  the output directory applies (see ``OUTPUT_DIR`` option of
+  ``swig_add_library()`` command).
+
+``OUTFILE_DIR``
+  Specify an output directory where the generated source file will be placed
+  (swig ``-o`` option) for the considered source file. If not specified,
+  ``OUTPUT_DIR`` source property will be used. If neither are specified, the
+  other ways to define output file directory applies (see ``OUTFILE_DIR``
+  option of ``swig_add_library()`` command).
+
 Target library properties can be set to apply same configuration to all SWIG
 input files.
 
@@ -209,6 +222,11 @@ information about support files generated by ``SWIG`` interface compilation.
   This output property specifies the directory where support files will be
   generated.
 
+  .. note::
+
+    When source property ``OUTPUT_DIR`` is defined, multiple directories can be
+    specified as part of ``SWIG_SUPPORT_FILES_DIRECTORY``.
+
 Some variables can be set to customize the behavior of ``swig_add_library``
 as well as ``SWIG``:
 
@@ -375,15 +393,24 @@ endfunction()
 function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   get_filename_component(swig_source_file_name_we "${infile}" NAME_WE)
   get_source_file_property(swig_source_file_cplusplus "${infile}" CPLUSPLUS)
-
-  # If CMAKE_SWIG_OUTDIR was specified then pass it to -outdir
-  if(CMAKE_SWIG_OUTDIR)
+  get_source_file_property(swig_source_file_outdir "${infile}" OUTPUT_DIR)
+  get_source_file_property(swig_source_file_outfiledir "${infile}" OUTFILE_DIR)
+
+  if (swig_source_file_outdir)
+    # use source file property
+    set(outdir "${swig_source_file_outdir}")
+    if (NOT swig_source_file_outfiledir)
+      set (swig_source_file_outfiledir "${outdir}")
+    endif()
+  elseif(CMAKE_SWIG_OUTDIR)
     set(outdir ${CMAKE_SWIG_OUTDIR})
   else()
     set(outdir ${CMAKE_CURRENT_BINARY_DIR})
   endif()
 
-  if(SWIG_OUTFILE_DIR)
+  if (swig_source_file_outfiledir)
+    set (outfiledir "${swig_source_file_outfiledir}")
+  elseif(SWIG_OUTFILE_DIR)
     set(outfiledir ${SWIG_OUTFILE_DIR})
   else()
     set(outfiledir ${outdir})
@@ -725,6 +752,7 @@ function(SWIG_ADD_LIBRARY name)
 
   set(swig_generated_sources)
   set(swig_generated_timestamps)
+  set(swig_generated_outdirs "${outputdir}")
   list(LENGTH swig_dot_i_sources swig_sources_count)
   if (swig_sources_count GREATER "1")
     # option -interface cannot be used
@@ -740,11 +768,16 @@ function(SWIG_ADD_LIBRARY name)
         "${workingdir}" swig_timestamp)
       list (APPEND swig_generated_timestamps "${swig_timestamp}")
     endif()
+    get_source_file_property(swig_source_file_outdir "${swig_it}" OUTPUT_DIR)
+    if (swig_source_file_outdir)
+      list (APPEND swig_generated_outdirs "${swig_source_file_outdir}")
+    endif()
   endforeach()
+  list(REMOVE_DUPLICATES swig_generated_outdirs)
   set_property (DIRECTORY APPEND PROPERTY
     ADDITIONAL_CLEAN_FILES ${swig_generated_sources} ${swig_generated_timestamps})
   if (UseSWIG_MODULE_VERSION VERSION_GREATER 1)
-    set_property (DIRECTORY APPEND PROPERTY ADDITIONAL_CLEAN_FILES "${outputdir}")
+    set_property (DIRECTORY APPEND PROPERTY ADDITIONAL_CLEAN_FILES ${swig_generated_outdirs})
   endif()
 
   add_library(${target_name}
@@ -828,8 +861,8 @@ function(SWIG_ADD_LIBRARY name)
     set_target_properties (${target_name} PROPERTIES PREFIX "")
   endif ()
 
-  # target property SWIG_SUPPORT_FILES_DIRECTORY specify output directory of support files
-  set_property (TARGET ${target_name} PROPERTY SWIG_SUPPORT_FILES_DIRECTORY "${outputdir}")
+  # target property SWIG_SUPPORT_FILES_DIRECTORY specify output directories of support files
+  set_property (TARGET ${target_name} PROPERTY SWIG_SUPPORT_FILES_DIRECTORY ${swig_generated_outdirs})
   # target property SWIG_SUPPORT_FILES lists principal proxy support files
   if (NOT SWIG_MODULE_${name}_NOPROXY)
     string(TOUPPER "${_SAM_LANGUAGE}" swig_uppercase_language)