[CMake] ExternalProjects: How do ExternalProject_add and ExternalProject_Add_Step interact?

[Luigi Calori]

There is some info at 
http://www.kitware.com/products/archive/kitware_quarterly1009.pdf

based on that I thought it was enouth do depend upon just the install in 
your case...

I am collecting external projects for several libs, It seem you are 
building at least VTK and Tcl and Tk that I lack...
Do you mind sharing? 

my stuff is (dis)organized as a series of packages and assemblies... far 
for being cross platform and complete though
If you like, have a look at
http://3d.cineca.it/storage/bazaar_repo/CmakeDeps/lib/wt/

Thanks in advance

Luigi



kent williams wrote:
> Answering my own question -- I think.  This maybe is information that
> could be added to the documentation for ExternalProjects.cmake!
>
> ExternalProject_Add creates a project, e.g.
>
> ExternalProject_Add(tcl
> CVS_REPOSITORY ":pserver:anonymous:@tcl.cvs.sourceforge.net:/cvsroot/tcl"
> CVS_TAG -r core-8-5-7
> CVS_MODULE  "tcl"
> CONFIGURE_COMMAND
> ${BRAINSTracer_BINARY_DIR}/tcl-prefix/src/tcl/unix/configure
> --prefix=${CMAKE_BINARY_DIR}
> INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}
> UPDATE_COMMAND ""
> )
>
> When the generated makefiles actually build the project, there's a
> directory named
>
> ${CMAKE_CURRENT_BINARY_DIR}/tcl-prefix/src/tcl-stamp
>
> In which a 0-length file is created after each step of the external
> project build is successfully finished.  These files (and THIS is what
> was undocumented, that I had to determine by poking around in the
> build directories) are named
>
> ${proj}-mkdir ${proj}-download ${proj}-update ${proj}-patch
> ${proj}-configure ${proj}-build ${proj}-install ${proj}-done
>
> Where 'proj' is the name you've given the ExternalProject.  So in
> order to add a step you have to list the steps your new custom step
> depends on, after the DEPENDEES keyword. For example:
>
> if(APPLE)
> set(SHARED_LIB_EXT .dylib)
> else(APPLE)
> set(SHARED_LIB_EXT .so)
> endif(APPLE)
>
> ExternalProject_Add_Step(${proj} after_install
> COMMAND chmod u+w ${BRAINSTracer_BINARY_DIR}/lib/libtcl8.5${SHARED_LIB_EXT}
> COMMENT "----------------------
> ${BRAINSTracer_BINARY_DIR}/lib/libtcl8.5.so installed read-only!"
> DEPENDEES mkdir update patch download configure build install
> )
>
> Now it appears that you have to list ALL the prerequisite steps, not
> just the one after which your step should occur.
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