Revert "Add a new function SWIG_GET_WRAPPER_DEPENDENCIES to UseSWIG.cmake"

This reverts commit 1088b0278e.

Wrapper dependency scanning (fix for #4147) does not work at CMake
configuration time if an input file is provided by a custom command
(regression #12307).  Revert to original behavior until a solution is
found.

Modules/UseSWIG.cmake

@@ -4,9 +4,6 @@
 #     - 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}.
@@ -41,58 +38,6 @@ 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 ${swig_getdeps_error} EQUAL 0)
-ENDMACRO(SWIG_GET_WRAPPER_DEPENDENCIES)
-
-
 #
 # For given swig module initialize variables associated with it
 #
@@ -221,10 +166,6 @@ MACRO(SWIG_ADD_SOURCE_TO_MODULE name outfiles infile)
   IF(SWIG_MODULE_${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}"