[CMake] Top level target depending on a file

[Alexander Broekhuis]

Hi,

>
>
> First of all, you definitely need the library target in order to build
> the library, and CMake ignores each file in the list of sources which
> is not necessary for this purpose. IMO, that's quite reasonable; e.g.,
> you wouldn't want to have the library relinked or even completely re-
> built because the manifest has been touched. Actually, there's simply
> no dependency of the library on the manifest.


This makes sense, the dependency is the other way, from the bundle to the
library. Until now I tried to see the manifest file as part of the target,
but I could as well see it a separate step.


> Furthermore, a TARGET-
> style custom command is triggered only when its target is rebuilt, so
> generating the ZIP file in this way is unsuitable since you will miss
> its dependency on the manifest. Thus, to express this dependency, you
> need to have an own target for the ZIP file, so you will end up with
> two targets if you want to have the dependencies set up correctly,
> although you'd prefer to have just one. BTW, is this really bad?
>

Reading the replies I think this might be the best solution. In this case I
would like to be able to add dependencies to the top-level target, eg I
would like to add my "bundle" targets to "ALL" since building the project
implicitly means the bundles need to be generated.

Again, previously I tried to see the Manifest file as a part of the
compilation unit. So a change to the file would trigger a rebuild of the
library and zip file, instead of only the zip file.


>
> Regards,
>
> Michael
>
> >> PS: Please don't drop the ML.
> >>
> >
> > I am used to mailing lists having the reply-to set, will try to keep it
> in
> > mind.
> >
> >
> >>
> >>> 2011/12/13 Michael Hertling <mhertling at online.de>
> >>>
> >>>> On 12/12/2011 11:40 AM, Alexander Broekhuis wrote:
> >>>>> Hi,
> >>>>>
> >>>>> Can anyone help me with this? I haven't found a proper solution
> myself
> >>>> yet..
> >>>>
> >>>> Does the following examplary project do what you intend?
> >>>>
> >>>> CMAKE_MINIMUM_REQUIRED(VERSION 2.8 FATAL_ERROR)
> >>>> PROJECT(P C)
> >>>> SET(CMAKE_VERBOSE_MAKEFILE ON)
> >>>> # The library target:
> >>>> FILE(WRITE ${CMAKE_BINARY_DIR}/f.c "void f(void){}\n")
> >>>> ADD_LIBRARY(f SHARED f.c)
> >>>> # The README file:
> >>>> FILE(WRITE ${CMAKE_BINARY_DIR}/README "Very important information!\n")
> >>>> # The ZIP file command:
> >>>> ADD_CUSTOM_COMMAND(OUTPUT ${CMAKE_BINARY_DIR}/f.zip
> >>>>    COMMAND zip -j ${CMAKE_BINARY_DIR}/f.zip
> >>>>                   ${CMAKE_BINARY_DIR}/README
> >>>>                   $<TARGET_FILE:f>
> >>>>    DEPENDS ${CMAKE_BINARY_DIR}/README)
> >>>> # The ZIP file target:
> >>>> ADD_CUSTOM_TARGET(zip ALL DEPENDS ${CMAKE_BINARY_DIR}/f.zip)
> >>>> # Trigger ZIP file target after library target:
> >>>> ADD_CUSTOM_COMMAND(TARGET f POST_BUILD
> >>>>    COMMAND ${CMAKE_COMMAND} -E remove ${CMAKE_BINARY_DIR}/f.zip
> >>>>    COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR}
> >>>>                             --config $<CONFIGURATION>
> >>>>                             --target zip)
> >>>>
> >>>> The basic idea is the decomposition of the ZIP file's generation into
> a
> >>>> custom target, an OUTPUT-style custom command and a TARGET-style
> custom
> >>>> command, the latter in conjunction with CMake's --build switch.
> >>>>
> >>>> Regards,
> >>>>
> >>>> Michael
> >>>>
> >>>>> 2011/12/8 Alexander Broekhuis <a.broekhuis at gmail.com>
> >>>>>
> >>>>>> Hi all,
> >>>>>>
> >>>>>> In my project, some top level targets depend on simple text files.
> >> These
> >>>>>> targets produce a zip file as output, this is done using a custom
> >>>> command
> >>>>>> with a post-build to a library target.
> >>>>>> Part of the zip file are some simple text files, which are included
> >>>> using
> >>>>>> some custom CPack handling inside the custom command.
> >>>>>>
> >>>>>> How can I let the top level target depend on these text files as
> well?
> >>>> In
> >>>>>> other words, if a text files changes, the zip file has to be
> >>>> regenerated.
> >>>>>> These text files are not generated or copied etc. So a simple
> DEPENDS
> >>>> would
> >>>>>> suffice. I know add_custom_command(OUTPUT has support for this, but
> am
> >>>>>> wondering how to do this with add_custom_command(TARGET.
> >>>>>>
> >>>>>> TiA!
> >>>>>>
> >>>>>> --
> >>>>>> Met vriendelijke groet,
> >>>>>>
> >>>>>> Alexander Broekhuis
> --
>
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
> Follow this link to subscribe/unsubscribe:
> http://www.cmake.org/mailman/listinfo/cmake
>



-- 
Met vriendelijke groet,

Alexander Broekhuis
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.cmake.org/pipermail/cmake/attachments/20111214/bf1fcb10/attachment.htm>