Subject: Re: [Boost-build] Call of interest
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2009-05-27 00:46:36
Konstantin Litvinenko wrote:
> Hi All!
thanks for sharing these with us!
> First of all I want to say thank you for so great build tool - Boost
> Build v2. I went all path from BBv1 to BBv2 and using BBv2 all the time.
> The concept on witch BBv2 relays is really rocks! But... There is
> always but... 1) Jam language is strange beast and all BBv2 code base is
> hard to understand and extend in the way I was needed; 2) Speed. It is
> terrible on huge projects. My current projects each consists of 30-50
> sub-projects. It takes 30 second for no-op build on my Core2Duo. It is
> too much for edit/compile/run/debug cycles.
> So I decide to start my own project that would be based on BBv2
> concepts but be much faster than BBv2. I decided to write it on c++
> because my goal was fast edit/compile cycles and I don't know Python :).
> For that time I knew about BBv2 Python Port and 'rewrite Jam in C++'
> projects. Both was rejected because they doesn't solve one of my goal -
> clean and precise error messages from build system.
Can you show example error messages from your system?
> It takes huge amount of time to produce something usable, but now I
> think Hammer, as I call it, is more or less ready to go in the wild.
> Here is main highlights:
> * build script syntax very close to Jam, but without any control flow
> statements. Only declarative rules. No variable declaration;
> * borrowed exe, obj, lib and others target declaration. Undistinguished
> from BBv2 declarations;
> * borrowed project hierarchy concept from BBv2. Requirements and usage
> requirements propagates down to sub-projects in filesystem;
> * different usage requirement propagation behavior - apply only to
> direct dependencies;
> * public and internal sources - with new usage requirement this allows
> to mix different library version in build the without conflicts
> lib a : /boost/thread/<version>1.36.0 ;
> lib b : @a /boost/thread/<version>1.39.0 ;
> will compile and run on Windows. On Unix this is problematic because
> of ld machinery. But in c++0x with inlined namespaces this problem will
> * builtin SCM support. I design Hammer to be able to fetch all needed
> projects from SCM in single build shot. You may start with only one
> hamfile(named as good old jamfile :) ) and do 'hammer /hammer/driver -i'
> - this will fetch all projects that needed for building hammer driver
> from the svn repository - about 40 modularized boost libraries,
> libantlr3c and hammer sources. Now it can work with svn only;
> * Hammer can generate Visual Studio 2005 projects and solution files.
> There is no limits in IDE projects generation, just no one write nothing
> else :);
So, is your system generating build description for other underlying tools?
>From the description above I gather that "no", but then I am not sure
what generated IDE projects contain/do.
> * Hammer is really fast. On the same project no-op build:
> BBv2 - 30 seconds
> Hammer - less than a second
> With huge amount of headers and sources it may take more time, but
> theoretically and practically its solvable problem;
> For now Hammer code base is full of hack/bugs/memleaks and all others
> nongood things. It has conceptually broken frontend because I made it
> just to somehow push the work further to have working prototype. But
> backend is more or less stable and clean. For now it can be easily build
> on Windows. It can work only with msvc-8.0 toolset. I has successfully
> build it on Linux and soon provide some rpm to play with it.
Do you have a custom build engine (the thing that decides what has to
be rebuilt, and what not). Is that engine capable of rescanning
header dependencies in a file that is itself generated during build process?
Does it have unit tests? Can it be easily modified to support signatures
(both for file content and for the updating commands)?
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