Re: [boost] Release 1_35_0_RC2

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-03-26 12:32:00

K. Noel Belcourt wrote:

> Hi Volodya,
> 
> On Mar 24, 2008, at 11:49 PM, Vladimir Prus wrote:
> 
>> K. Noel Belcourt wrote:
>>
>>> (3) The address-model property in intel-darwin.jam isn't properly
>>> configured.  I've attached a patch to fix tools/build/v2/tools/intel-
>>> darwin.jam to make this work with address-model=32,64.
>>
>> Why you've left  -mcmodel=small commented out? Does this option
>> actually exist, and if so, is it good for anything? Or -m32/-m64 make
>> this option unnecessary.
> 
> When I first added the intel-darwin toolset, the -m32/-m64 options
> were not documented and the only option I could find that dealt with
> the address model was the -mcmodel option.   I've since discovered
> that, though undocumented in the older intel compilers, the intel
> compilers do support -m32/-m64.
> 
> I think that address-model=32,64 maps most closely to -m32/-m64 so
> that's why I removed the mcmodel option.
> 
> -- Noel
> 
> [ Documentation of the -mcmodel option in intel-10.0 ]
> 
>         -mcmodel=<mem_model> (i64em)
>                Tells  the  compiler  to use a specific memory model
> to generate
>                code and  store  data.   Default  is  -
> mcmodel=small.   Possible
>                <mem_model> values are:
> 
>                   small  --  Restrict code and data to the first 2GB
> of address
>                   space.  Use relative addressing.
> 
>                   medium -- Restrict code to the first 2GB.  Code
> access  uses
>                   IP-relative  addressing,  but  data accesses
> require absolute
>                   addressing.
> 
>                   large -- Places no memory restriction on code  or
> data.  All
>                   accesses of code and data must be done with
> absolute address-
>                   ing.

I wonder if -m64 without any additional options limits code and data
to 2GB? That would be not very logical, but I'm not sure.

- Volodya

Hmm. Presumably, -m64