Re: [boost] [context review] Several Questions

Subject: Re: [boost] [context review] Several Questions
From: Oliver Kowalke (oliver.kowalke_at_[hidden])
Date: 2011-03-22 03:10:10

-------- Original-Nachricht --------
> Datum: Mon, 21 Mar 2011 22:04:54 -0700 (PDT)
> Von: Artyom <artyomtnk_at_[hidden]>
> An: boost_at_[hidden]
> Betreff: Re: [boost] [context review] Several Questions

> > could you please so kind to get my working  tree?
> 
> > 
> > git clone git://git.gitorious.org/boost-dev/boost-dev.git
> > 
> > It  would help that we are using the same code basis.
> > 
> 
> Ok, I can take a look on this, but see notes below.

not necessary - thx

> I'm not missing -fPIC option. -fPIC is used only for 
> building shared object, you don't use it for executables!
> 
> I don't know why bjam adds it for executables. It is plane
> wrong (harmless but wrong). No other mature build systems
> like CMake or autotools does this.
> 
> In the real world users would not use bjam and would
> not compile their executables with -fPIC as it is not
> required.

it was too late last night - I'll take care of it this afternoon

> > I think it is better to build the examples with  bjam. That means:
> > 
> 
> No, I should build libraries with bjam, but by no means,
> any code I write should be build with it. :-)

I thought bjam is the default for compiling boost libs? at least the docs tell it

> > > I  mean something like
> > >
> > > boost::context<>  // some  default
> > > boost::ucontext<>
> > >  boost::fcontext<>

> You can always fall-back to ucontext if assembly version is not provided.
> 
> I think it would be very useful. Because different parts of program
> may required different contexts and inability to use two of them
> in same executable is quite problematic.

the problem is that it is unlikely that I can implement fcontext for all platforms and ucontext is not available for some platforms (for instance ARM - I know glibc-ports but you don't have always the possiblity to patch/recompile the C-lib).
that means on some systems boost::ucontext<>/boost::fcontext<> may not be available. I've some doubt that this is acceptable.

regards, Oliver

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