Re: [Boost-build] [bjam] Incremental builds and deleted/moved header dependencies

From: David Abrahams (dave_at_[hidden])
Date: 2007-05-02 11:14:36

on Tue Apr 24 2007, "Johan Nilsson" <r.johan.nilsson-AT-gmail.com> wrote:

> This is probably not possible (or perhaps not even desirable to resolve), 
> but I just need to get some comments on this issue:
>
> 1. Suppose that file a.cpp depends on a.hpp and a_util.hpp (included from 
> a.cpp).
> 2. Suppose that running bjam in the project folder happily produces the exe 
> "a".
> 3. Then, I delete a_util.hpp and rerun bjam (without the -a flag).
> 4. Nothing happens, as the change isn't detected.
>
> This can't be the desired result.  Intuitively, I'd expect an
> attempt for recompilation of a.cpp with a failure due to the missing
> header.

I'm inclined to agree.

> I realize why the recompilation shouldn't happen in the general case, as 
> this would otherwise cause constant rebuilds whenever bjam couldn't locate 
> an included header file. 

Hm.  I'm not sure that's a big deal except for system headers.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com
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