From 963837cf173fac75ffdabfa0ba754775968b5547 Mon Sep 17 00:00:00 2001
From: Marc Chevrier <marc.chevrier@sap.com>
Date: Tue, 10 Apr 2018 10:54:01 +0200
Subject: UseSWIG: fix erroneous generator expressions

Add note regarding multi-config generators
---
 Modules/UseSWIG.cmake | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/Modules/UseSWIG.cmake b/Modules/UseSWIG.cmake
index 5f9afc1..8713cd8 100644
--- a/Modules/UseSWIG.cmake
+++ b/Modules/UseSWIG.cmake
@@ -28,7 +28,11 @@ Defines the following command for use with ``SWIG``:
   those targets can be used with any command expecting a target (e.g.
   :command:`target_link_libraries`).
 
-  The arguments are:
+  .. note::
+
+    For multi-config generators, this module does not support
+    configuration-specific files generated by ``SWIG``. All build
+    configurations must result in the same generated source file.
 
   ``TYPE``
     ``SHARED``, ``MODULE`` and ``STATIC`` have the same semantic as for the
@@ -297,7 +301,7 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   # handle various swig compile flags properties
   get_source_file_property (include_directories "${infile}" INCLUDE_DIRECTORIES)
   if (include_directories)
-    list (APPEND swig_source_file_flags "-I$<JOIN:${include_directories},$<SEMICOLON>-I>")
+    list (APPEND swig_source_file_flags "$<$<BOOL:${include_directories}>:-I$<JOIN:${include_directories},$<SEMICOLON>-I>>")
   endif()
   set (property "$<TARGET_PROPERTY:${name},SWIG_INCLUDE_DIRECTORIES>")
   list (APPEND swig_source_file_flags "$<$<BOOL:${property}>:-I$<JOIN:${property},$<SEMICOLON>-I>>")
@@ -306,7 +310,7 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   list (APPEND swig_source_file_flags "$<$<BOOL:${property}>:-D$<JOIN:${property},$<SEMICOLON>-D>>")
   get_source_file_property (compile_definitions "${infile}" COMPILE_DEFINITIONS)
   if (compile_definitions)
-    list (APPEND swig_source_file_flags "-D$<JOIN:${compile_definitions},$<SEMICOLON>-D>")
+    list (APPEND swig_source_file_flags "$<$<BOOL:${compile_definitions}>:-D$<JOIN:${compile_definitions},$<SEMICOLON>-D>>")
   endif()
 
   list (APPEND swig_source_file_flags "$<TARGET_PROPERTY:${name},SWIG_COMPILE_OPTIONS>")
@@ -348,7 +352,7 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   list (REMOVE_DUPLICATES cmake_include_directories)
   set (swig_include_dirs)
   if (cmake_include_directories)
-    set (swig_include_dirs "-I$<JOIN:${cmake_include_directories},$<SEMICOLON>-I>")
+    set (swig_include_dirs "$<$<BOOL:${cmake_include_directories}>:-I$<JOIN:${cmake_include_directories},$<SEMICOLON>-I>>")
   endif()
 
   set(swig_special_flags)
@@ -374,7 +378,7 @@ function(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
     list (APPEND swig_dependencies ${file_depends})
   endif()
 
-  if (UseSWIG_MODULE_VERSION VERSION_EQUAL 2)
+  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}")
@@ -501,7 +505,7 @@ function(SWIG_ADD_LIBRARY name)
     if (CMAKE_SWIG_OUTDIR)
       set (outputdir "${CMAKE_SWIG_OUTDIR}")
     else()
-      if (UseSWIG_MODULE_VERSION VERSION_EQUAL 2)
+      if (UseSWIG_MODULE_VERSION VERSION_GREATER 1)
         set (outputdir "${workingdir}/${_SAM_LANGUAGE}.files")
       else()
         set (outputdir "${CMAKE_CURRENT_BINARY_DIR}")
@@ -550,7 +554,7 @@ function(SWIG_ADD_LIBRARY name)
   endforeach()
   set_property (DIRECTORY APPEND PROPERTY
     ADDITIONAL_MAKE_CLEAN_FILES ${swig_generated_sources} ${swig_generated_timestamps})
-  if (UseSWIG_MODULE_VERSION VERSION_EQUAL 2)
+  if (UseSWIG_MODULE_VERSION VERSION_GREATER 1)
     set_property (DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES "${outputdir}")
   endif()
 
-- 
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