[CMake] Fwd: Generated file dependency

[Nikolay Mitev]

[posting to the list, since I accidentally replied only to Sergey]
On Thu, Apr 23, 2009 at 1:48 PM, Sergey Rudchenko <
sergey.rudchenko at gmail.com> wrote:

> On Thu, 2009-04-23 at 13:37 +0300, Nikolay Mitev wrote:
> > Hi
> >
> > I have the following situation:
> >
> > files: test.cpp test.h
> >
> > I want to process the file test.cpp with a custom pre-processor which
> > will generate, say, test.ii.cpp which will get compiled into
> > libtest.a. test.cpp just includes test.h.
> >
> > This is my CMakeLists.txt file:
> >
> > cmake_minimum_required(VERSION 2.6)
> >
> > add_custom_command (OUTPUT test.ii.cpp
> >   COMMAND preprocess test.cpp test.ii.cpp
> >   DEPENDS test.cpp
> >   COMMENT "Creating test.ii.cpp"
> >   VERBATIM)
> >
> > add_library (test test.ii.cpp)
> >
> > All dandy, but when I modify test.h the preprocessing step is not run,
> > but just the compile step for test.ii.cpp. How can I make it so, that
> > when the header is modified the preprocessing and the compilation
> > steps are both run?
>
> Did you try to list the test.h in the DEPENDS list?
>

Yes, and this works, but I really don't want to keep this list up-to-date
manually. The project involves hundreds of files, so I'm looking for a way
to automate this. Is there a way to extract the dependencies of test.cpp and
make test.ii.cpp depend on them?


Nikolay
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