Re: MSVC tool cpp source RSP combination problem

From: David Abrahams (dave_at_[hidden])
Date: 2005-08-12 10:22:05

"CyberCying" <cying_at_[hidden]> writes:

> Hi there,
>
> In msvc.jam, there is three lines of comment saying:
>
> # is it possible to combine these?
> # make the generators non-composing, so that they don't convert each 
> source
> # into separate rsp file.
>
> I wonder if someone can solve this issue? Combining all cpp sources 
> into one RSP file greatly *improves* compilation performance. In 
> contrast, current implementation is *MUCH* slower then using DEVENV 
> VC project file because VC DEVENV puts app cpp files into a single 
> RSP file.
>
> Bjam is a good tool in every aspect. It just happen that I have adopt 
> it into several mission-critical projects. And build-time of Bjam in 
> VC project is significant slower than using DEVENV. It's really 
> discouraging. So any helps are greatly appreciated. 

Having the capability you seek _was_ one of the design goals of BBv2.
However, now that we'ver removed the "best conversions sequence"
heuristic, the sequence of generators for constructing a target needs
to be found _unambiguously_ or an error will be issued. That might
have made it impossible to reach that goal; I'm not sure.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com