[CMake] Fwd: Generated file dependency

[James Bigler]

On Thu, Apr 23, 2009 at 6:50 AM, Nikolay Mitev <face.mitev at gmail.com> wrote:

> [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
>
>
If you have a C or CXX language file look the documentation for
add_custom_command and IMPLICIT_DEPENDS.

James
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