I'm trying to implement the stuff found in
http://www.cmake.org/Bug/bug.php?op=show&bugid=1731
http://www.cmake.org/Bug/bug.php?op=show&bugid=2172
http://www.cmake.org/pipermail/cmake/2005-August/007102.html
http://www.itk.org/cgi-bin/viewcvs.cgi/Wrapping/CSwig/CMakeLists.txt?rev=1.55&root=Insight&view=auto
Here's the general idea:
Basically the custom command runs the first time because the output is
not present. The custom command generates its output AND a list of
dependencies. The list is dumped via copy-if-different to a file that
is read by CMake. This causes CMake to re-run and include the list of
dependencies in the DEPENDS argument of the custom command.
I can't seem to figure out how this is working in this giant file.
CSWIG_CREATE_PYTHON_CXX_FILE seems to build the dependency file from swig:
=====================================================================
MACRO(CSWIG_CREATE_PYTHON_CXX_FILE Bin MasterIdx InputIdx InputXml
OutputTclCxx Library LibraryIndexFiles)
SET(CINDEX)
FOREACH(MIDX ${MasterIdx})
SET(CINDEX ${CINDEX} -Cindex "${MIDX}")
ENDFOREACH(MIDX)
IF("${InputXml}" MATCHES "${ITK_CSWIG_PYTHON_NO_EXCEPTION_REGEX}")
SET(ITK_SWG_FILE "")
ELSE("${InputXml}" MATCHES "${ITK_CSWIG_PYTHON_NO_EXCEPTION_REGEX}")
SET(ITK_SWG_FILE "-l${ITK_TOP}/Wrapping/CSwig/itk.swg")
ENDIF("${InputXml}" MATCHES "${ITK_CSWIG_PYTHON_NO_EXCEPTION_REGEX}")
ADD_CUSTOM_COMMAND(
COMMENT "${OutputTclCxx} from "
SOURCE ${Bin}/${InputIdx}
COMMAND ${CSWIG}
ARGS ${ITK_SWG_FILE}
-I${ITK_SWIG_DEFAULT_LIB}
-I${ITK_SWIG_DEFAULT_LIB}/python
-noruntime ${CINDEX} ${IGNORE_WARNINGS} -depend
${Bin}/${InputXml}.depend
-outdir "${EXECUTABLE_OUTPUT_PATH}/${CMAKE_CFG_INTDIR}"
-o ${Bin}/${OutputTclCxx} -python -c++ ${Bin}/${InputXml}
TARGET ${Library}
OUTPUTS ${Bin}/${OutputTclCxx}
DEPENDS ${LibraryIndexFiles} ${ITK_TOP}/Wrapping/CSwig/itk.swg
${ITK_TOP}/Wrapping/CSwig/itk.swg ${Bin}/${InputXml} ${CSWIG} )
ENDMACRO(CSWIG_CREATE_PYTHON_CXX_FILE)
====================================================================
However, I don't see how the dependency file is pulled into CMake.
Where is the copy-if-different in this example file?
I'm so very confused and frustrated. Perhaps someone could give me a
simple example where dependency files are generated and pulled in, please.
Thanks,
James
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