Re: inopportune rebuild

From: TEMPLIE Cédric (cedric.templie_at_[hidden])
Date: 2005-01-05 10:36:39

I create a little test project to show the rebuilding.
Maybe it will help to explain to me why there is a rebuild...

To run the test, run bjam from top-level, change nothing, and re-run bjam.

My questions are :
- why the project2.h is copied ?
- why project3 is rebuild (I supposed because project2.h is copied) ?

Thx

TEMPLIE Cédric

TEMPLIE Cédric wrote:
> Hi,
> 
> I use <dependency> in my project requirements to specify which projects 
> have to be build before the current project can be build...
> 
> In most cases project to build before have themself dependency project.
> These dependency project could be the same for 2 projects...
> 
> It seems that if there is at least one cross dependency, the system 
> rebuild unnecessary things.
> 
> ex:
> 
> project a : <dependency>/b <dependency>/c
> project b : <dependency>/d
> project c : <dependency>/d
> 
> if I build project a by doing bjam debug in the dir of project a, it 
> build b, c, d and a. Just after without modifying anything, I retry to 
> build project a (bjam debug).
> it rebuild project b, c, d and a....
> 
> I suppose that it is the way <dependency> work.
> 
> Anyway, I do not like very much to use <dependency>, I am sure using 
> <source> to depends on other project libraries is the better way to 
> work. And I think that using that will avoid my rebuild issues.
> 
> 
> I know that my system is complex, but all difficulties I have are 
> because when I build a project, I also need to stage some sources...
> 
> Vladimir Prus told me a solution: have an alias at top-level that calls 
> all of stage rules of my subprojects, but what I want is to stage things 
> only when the project is build... so it is not enough. Or I missed 
> something in the explanation of Vladimir Prus...
> 
> But if there is a way to tell the system to stage some things after 
> building (without to have something like bjam install) I certainly 
> change my build system to use <source>.
> I mean if a project need a lib to build, the fact to build this lib 
> implies that the lib and its headers is exported in a specific directory.
> 
> I know that Vladimir Prus was working on stage dependencies, but I don't 
> know what is the state of the work he did.
> 
> One other thing, I want to be able to build all projects from the 
> top-level and projects individually.
> 
> Thanks in advance
> 
> TEMPLIE Cédric
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 

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