[CMake] Complete rebuild after svn update

[Eric Noulard]

2010/10/18 Alex Brooks <a.brooks at marathon-targets.com>:
> Hi,
>
> I have a problem where cmake decides to rebuild my entire source tree when an
> svn update pulls in a change to a CMakeLists.txt file.
>
> I have a fairly complicated build tree with a number of sub-libraries etc.
> The whole thing takes something like an hour to build, so it's a big chunk out
> of my day.
>
> I tried a few things to characterise the problem:
>  - If I locally touch CMakeLists.txt files, or even make non-trivial changes,
> cmake does the correct thing and just rebuilds what is necessary.
>  - If an svn update pulls in a changes to .h or .cpp files, cmake again does
> the correct thing.
>  - If an svn update pulls in even a trivial change (e.g. a change to a
> comment), cmake rebuilds every single source file.
>
> I've run out of ideas about how to characterise the problem better, does
> anyone have any ideas what the problem might be, or what to do next to track
> it down further?

May be svn is the culprit.

Did you have a look at the timestamp of the file/directory enclosing
(and up) the
changed CMakeLists.txt after the svn update?

May be a single change inside a directory change the timestamp
of a set of file?

Another option may be that this particular CMakeLists.txt is generating
(using configure_file) some file that is [indirectly] included by many other?

May be you can have look at the dependencies in
CMakeFiles/Makefile.cmake
-- 
Erk
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