[CMake] complete rebuild

[Anders Backman]

Hi all.

I have a problem where I have a project of C++ headers and source files
which are built into a .lib .dll.
Now this works just fine with CMake 2.8.x and VisualStudio 2008.

I press F7 everything builds. I press F7 again, it is all built, nothing to
be done.

But now when I move over to vs2010, I get into problems where no matter how
I build the project, it constantly want to rebuild everything.

I have tried both 'msbuild project.sln' from the command line, as well as
build (F7) inside of VisualStudio  as well as using Incredibuild. The result
is the same. If I press F7, it builds everything as it was not built before.

I did some googling on the issue, and some suggest that there is a file in
the project (header) which does not exist on disk, causing the problem.
We do file(glob) on all files, so a file which is not found, should not be
part of the project.

Right now, it seems to be hard to reduce the problem. When I start from the
full project, 107 files, it want to rebuild everything.
When I reduce the problem, I can get down to one single file, still it wants
to build it. Its a c file, and there is nothing special about it. I even
managed to reduce that down to one function, no includes. still the same
problem.

If I copy the relevant files (a few cmakelists.txt and the directory
structure, including the two files (.h .c) it builds as it should again.
I tried to run cmake and generate vs2008 files, that works. Open them in
vs2010, build, then that works (with the two files only).


So anyway, before I put you all to sleep, as far as I know, there are two
dependency parsers involved here:

- CMake runs through source files and generates dependencies, right?
- THen visual studio does the same (generating the External dependencies
folder in the project). Now there is SOMETHING wrong in either one, or both
or none related to VS2010.

Does someone have any hints on how to debug this problem? I have spent
substantial time, and I cant seem to get anywhere.
I cant reduce it to something I can post on the list, as it just magically
works when I want to rip it out.

At one point, I had 3 cmakelists, each with about 3 lines. 2 source files
(.h .c), I did clean on CMakeCache.txt between each cmake . run, loaded the
project build and got the error. Fairly simple scene. But as soon as I try
to move that to another dir, it fails.

Thankful for any advice on the matter.


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