[CMake] Building ADD_CUSTOM_TARGET dependency

[William A. Hoffman]

You may want to look here:

http://public.kitware.com/Wiki/CMake_FAQ#How_can_I_generate_a_source_file_during_the_build.3F


At 09:02 AM 11/14/2005, Alex Brooks wrote:
>Hi,
>
>I've used CMake for a while now, but I can't seem to do the following kinda 
>complicated task:
>[ I'm using CMake version 2.2.2 ]
>
>
>(1): ADD_CUSTOM_TARGET definition
>================================
>
>I want to generate .cfg files from .def files using the following macro:
>
>MACRO( GENERATE_FROM_DEF DEF_FILE )
>  STRING( REGEX REPLACE "\\.def" ".cfg" CFG_FILE ${DEF_FILE} )
>  ADD_CUSTOM_TARGET( 
>    ${CFG_FILE} ALL
>    generatecfg ${DEF_FILE} ${CFG_FILE}
>    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${DEF_FILE} generatecfg )
>ENDMACRO( GENERATE_FROM_DEF DEF_FILE )
>
>The problem is that generatecfg is a c++ executable that has to be compiled 
>first.  That's why I put it as a dependency (the last term in 
>ADD_CUSTOM_TARGET above).
>
>(2): generatecfg taget definition
>==========================
>
>The generatecfg target is defined as follows (in 
>src/utils/liborcadefutil/orcadefutil/):
>
>INCLUDE_DIRECTORIES( ${PROJ_SOURCE_DIR}/src/utils/liborcadefutil )
>ADD_LIBRARY( OrcaDefUtil SHARED defparser.cpp componentdefinition.cpp )
>ADD_EXECUTABLE( generatecfg generatecfg.cpp )
>TARGET_LINK_LIBRARIES( generatecfg OrcaDefUtil )
>
>The important bit here is the INCLUDE_DIRECTORIES line, which is required to 
>build generatecfg.cpp.
>
>(3): generatecfg use
>=================
>
>At some point (from src/components/lasermon) I call the macro:
>
>GENERATE_FROM_DEF( lasermon.def )
>
>This command relies on generatecfg.  From (1), CMake knows that generatecfg 
>has to be built first.  So if I try to compile from the 
>src/components/lasermon directory I get:
>
>$ cd src/components/lasermon
>$ make VERBOSE=1
>
><snip>
>make[3]: Entering directory `/home/users/a.brooks/cvs/orca2'
>/home/users/a.brooks/bin/g++     
>src/utils/liborcadefutil/orcadefutil/generatecfg.cpp   -o 
>src/utils/liborcadefutil/orcadefutil/generatecfg
>src/utils/liborcadefutil/orcadefutil/generatecfg.cpp:1:35: 
>orcadefutil/defparser.h: No such file or directory
><snip>
>
>The problem is that when compiling generatecfg, CMake seems to have neglected 
>to add "-Isrc/utils/liborcadefutil/orcadefutil/".  It should have done this 
>from the "INCLUDE_DIRECTORIES( ${PROJ_SOURCE_DIR}/src/utils/liborcadefutil )" 
>line in (2).
>
>Does anyone know what's happening here?  I've been battling with this for a 
>while...
>
>
>Thanks very much,
>
>Alex
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