[CMake] complete rebuild

Thu Dec 30 06:06:01 EST 2010

I think I managed to reproduce the problem, partially.

The file below contains a project which for me reproduces the problem when I
use msbuild.
F7 (Build->BuildSolution) works (builds only once, then next time, it does
nothing).

So there is something in the combination of CMake and msbuild which causes
the problem.
We use Incredibuild, which uses msbuild, hence we get the problem also in
Incredibuild.
I do not know the difference between F7 and msbuild though.

http://rapidshare.com/files/439941435/DependencyBug.rar

Instructions:

1. Unpack dep2.rar into a new empty directory
2. install CMake (2.8.2 or later)
http://www.cmake.org/files/v2.8/cmake-2.8.3-win32-x86.exe
3 go to the directory in a command prompt
4. execute: cmake .
5. msbuild DepBug.sln
6. msbuild DepBug.sln << Builds everything again from scratch.

/A
On Wed, Dec 29, 2010 at 1:26 PM, Anders Backman <andersb at cs.umu.se> wrote:

> Ok, Im already using the nightly build (from Tuesday I believe), as I
> discovered a bug in CMake yesterday.
> I will bug M$ too :-)
>
> /A
>
>
> On Wed, Dec 29, 2010 at 1:03 PM, David Cole <david.cole at kitware.com>wrote:
>
>> For Visual Studio generators, CMake does *NO* depedency analysis. It
>> generates solution and project files such that Visual Studio can do
>> all the dependency analysis and decide what to re-build when files
>> change.
>>
>> My advice to you would be:
>> - use only CMake 2.8.3 or newer (a nightly development build of CMake)
>> with Visual Studio 10 -- CMake 2.8.2 and earlier had significant bugs
>> related to VS10 that have since been resolved...
>> - using a newer CMake, isolate the problem to a minimally reproducible
>> case and then report a bug in the bug tracker about it including the
>> steps to reproduce the problem
>>
>> Reply here again and point us to the bug.
>>
>>
>> HTH,
>> David
>>
>>
>> On Wed, Dec 29, 2010 at 4:07 AM, Anders Backman <andersb at cs.umu.se>
>> wrote:
>> > 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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>>
>
>
>
> --
>
>

-- 
__________________________________________
Anders Backman, CTO  Algoryx Simulation AB
Uminova Science Park, Box 7973,  SE-907 19
Umeå,  Sweden
anders at algoryx.se http://www.algoryx.se
Cell: +46-70-392 64 67
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