Re: [Boost-build] bug? bultin properties not set

Subject: Re: [Boost-build] bug? bultin properties not set
From: Vladimir Prus (ghost_at_[hidden])
Date: 2010-04-02 09:19:56

Rene Rivera wrote:
> Oliver Kowalke wrote:
>> Rene Rivera schrieb:
>>> Oliver Kowalke wrote:
>>>> bjam --debug-building does notcontain the builtin properites such as 
>>>> <architecture>, <address-model>, <instruction-set>. But <target-os> 
>>>> is set. Because the User Handbook doesn't tell anything why some of 
>>>> the bultin props are not set (props of the target os/platform) I 
>>>> assume it is a bug.
>>>> May this be correct?
>>>
>>> Those three properties you mention, architecture, address-model, and 
>>> instruction-set, are defined as optional. Hence they are not set by 
>>> default. This fits the model of compilers to have a default for those 
>>> that they compile to.
>>
>> Does boost.build provide functions returning the correct values or do 
>> I have to implement those by myself?
> 
> I'm not sure what you are asking here. Do you want some programatic way 
> to find out what the compilers default values are? Or do you want to 
> know what the possible values BBv2 has for those?
> 
> For the latter they are listed in builtin.jam 
> <https://svn.boost.org/trac/boost/browser/trunk/tools/build/v2/tools/builtin.jam#L235>. 
> Note that the ability to actually specify those and have them take 
> effect in building depends on whether the toolset has mappings for them 
> to the corresponding compiler options. BUt you can always specify them 
> and then add your own options based on them.

Note that I do plan to automatically set at least address-model based on discovered
information from gcc -- but this is likely to be only available for gcc.

- Volodya