Add a new function SWIG_GET_WRAPPER_DEPENDENCIES to UseSWIG.cmake

This commit fixes BUG: 0004147 it directly uses swig executable
to compute a list of dependencies directly from the .i files
to make sure to rebuild the swig module any of its direct dep.
is touched

Modules/UseSWIG.cmake

@@ -4,6 +4,9 @@
 #     - Define swig module with given name and specified language
 #   SWIG_LINK_LIBRARIES(name [ libraries ])
 #     - Link libraries to swig module
+#   SWIG_GET_WRAPPER_DEPENDENCIES(swigFile genWrapper language DEST_VARIABLE)
+#     - Put dependencies of the wrapper genWrapper generated by swig from
+#     swigFile in DEST_VARIABLE
 # All other macros are for internal use only.
 # To get the actual name of the swig module,
 # use: ${SWIG_MODULE_${name}_REAL_NAME}.
@@ -38,6 +41,58 @@ SET(SWIG_EXTRA_LIBRARIES "")
 
 SET(SWIG_PYTHON_EXTRA_FILE_EXTENSION "py")
 
+#
+# Get dependencies of the generated wrapper.
+#
+MACRO(SWIG_GET_WRAPPER_DEPENDENCIES swigFile genWrapper language DEST_VARIABLE)
+  GET_FILENAME_COMPONENT(swig_getdeps_basename ${swigFile} NAME_WE)
+  GET_FILENAME_COMPONENT(swig_getdeps_outdir ${genWrapper} PATH)
+  GET_SOURCE_FILE_PROPERTY(swig_getdeps_extra_flags "${swigFile}" SWIG_FLAGS)
+  IF("${swig_getdeps_extra_flags}" STREQUAL "NOTFOUND")
+    SET(swig_getdeps_extra_flags "")
+  ENDIF("${swig_getdeps_extra_flags}" STREQUAL "NOTFOUND")
+
+  IF(NOT swig_getdeps_outdir)
+    SET(swig_getdeps_outdir ${CMAKE_CURRENT_BINARY_DIR})
+  ENDIF(NOT swig_getdeps_outdir)
+  SET(swig_getdeps_depsfile
+    ${swig_getdeps_outdir}/swig_${swig_getdeps_basename}_deps.txt)
+  GET_DIRECTORY_PROPERTY(swig_getdeps_include_directories INCLUDE_DIRECTORIES)
+  SET(swig_getdeps_include_dirs)
+  FOREACH(it ${swig_getdeps_include_directories})
+    SET(swig_getdeps_include_dirs ${swig_getdeps_include_dirs} "-I${it}")
+  ENDFOREACH(it)
+  EXECUTE_PROCESS(
+    COMMAND ${SWIG_EXECUTABLE}
+    -MM -MF ${swig_getdeps_depsfile} ${swig_getdeps_extra_flags}
+    ${CMAKE_SWIG_FLAGS} -${language}
+    -o ${genWrapper} ${swig_getdeps_include_dirs} ${swigFile}
+    RESULT_VARIABLE swig_getdeps_result
+    ERROR_VARIABLE swig_getdeps_error
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  IF(NOT ${swig_getdeps_error} EQUAL 0)
+    MESSAGE(SEND_ERROR "Command \"${SWIG_EXECUTABLE} -MM -MF ${swig_getdeps_depsfile} ${swig_getdeps_extra_flags} ${CMAKE_SWIG_FLAGS} -${language} -o ${genWrapper} ${swig_getdeps_include_dirs} ${swigFile}\" failed with output:\n${swig_getdeps_error}")
+    SET(swig_getdeps_dependencies "")
+  ELSE(NOT ${swig_getdeps_error} EQUAL 0)
+    FILE(READ ${swig_getdeps_depsfile} ${DEST_VARIABLE})
+    # Remove the first line
+    STRING(REGEX REPLACE "^.+: +\\\\\n +" ""
+      ${DEST_VARIABLE} "${${DEST_VARIABLE}}")
+    # Clean the end of each line
+    STRING(REGEX REPLACE " +(\\\\)?\n" "\n" ${DEST_VARIABLE}
+      "${${DEST_VARIABLE}}")
+    # Clean beginning of each line
+    STRING(REGEX REPLACE "\n +" "\n"
+      ${DEST_VARIABLE} "${${DEST_VARIABLE}}")
+    # clean paths
+    STRING(REGEX REPLACE "\\\\\\\\" "/" ${DEST_VARIABLE}
+      "${${DEST_VARIABLE}}")
+    STRING(REGEX REPLACE "\n" ";"
+      ${DEST_VARIABLE} "${${DEST_VARIABLE}}")
+  ENDIF(NOT ${swig_getdeps_error} EQUAL 0)
+ENDMACRO(SWIG_GET_WRAPPER_DEPENDENCIES)
+
+
 #
 # For given swig module initialize variables associated with it
 #
@@ -166,6 +221,10 @@ MACRO(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   IF(SWIG_MODULE_${name}_EXTRA_FLAGS)
     SET(swig_extra_flags ${swig_extra_flags} ${SWIG_MODULE_${name}_EXTRA_FLAGS})
   ENDIF(SWIG_MODULE_${name}_EXTRA_FLAGS)
+  SWIG_GET_WRAPPER_DEPENDENCIES("${swig_source_file_fullname}"
+    "${swig_generated_file_fullname}" ${SWIG_MODULE_${name}_SWIG_LANGUAGE_FLAG}
+    swig_extra_dependencies)
+  LIST(APPEND SWIG_MODULE_${name}_EXTRA_DEPS ${swig_extra_dependencies})
   ADD_CUSTOM_COMMAND(
     OUTPUT "${swig_generated_file_fullname}" ${swig_extra_generated_files}
     COMMAND "${SWIG_EXECUTABLE}"