Re: Incrementally rebuild bjam?

From: David Abrahams (dave_at_[hidden])
Date: 2004-12-09 17:22:04

Toon Knapen wrote:
> David Abrahams wrote:
>> Hi,
>> 
>> I'd like to be able to issue some command to rebuild bjam only when it's
>> out of date. I am going to run a script that does this repeatedly and I
>> don't want to waste CPU cycles rebuilding bjam when it's unneeded. Is
>> there a way (that doesn't involve knowing the guessed toolset name
>> beforehand?)
> 
> 
> IIUC build.sh first builds bjam0 from the sources. And than bjam is 
> generated from the sources using bjam0. Well if you know you already 
> have a bjam0, you can directly call bjam0. I don't know the different 
> between bjam0 and the final bjam executable that is generated but I 
> guess that bjam0 will also do dependency checking and thus only rebuild 
> what is out of date.

Yes it does do that. The problem is that jam0 is built into a bootstrap
directory whose identity depends on the guessed toolset.

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