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From: Edward Diener (eldiener_at_[hidden])
Date: 2019-07-10 07:42:38

On 7/9/2019 10:01 PM, Rene Rivera via Boost-build wrote:
> On Tue, Jul 9, 2019 at 7:58 PM Edward Diener via Boost-build
> <boost-build_at_[hidden] <mailto:boost-build_at_[hidden]>> wrote:
> On 7/9/2019 11:30 AM, Edward Diener via Boost-build wrote:
> > On 7/9/2019 8:47 AM, Edward Diener via Boost-build wrote:
> >> I would like to include different bjam code, using the 'include'
> rule,
> >> into a jamfile based on the address-model used when b2 is
> invoked. Is
> >> this doable, and if so how ? Would it make any difference if the
> >> jamfile involved were 'user-config.jam' ?
> >>
> >> Essentially I need to use different toolset definitions
> depending on
> >> whether the compile is for 32 bit or 64-bit code and I thought the
> >> easiest way to do this would be just to include different toolset
> >> definitions into my user-config.jam depending on the address
> model. If
> >> there is a better way to do this within bjam I would love to
> know what
> >> it is. Most of the toolsets involved are compilers but some are
> just
> >> other tools such as zip libraries like bzip2 and there is also the
> >> python toolset.
> >>
> >> My current method of doing this is to link a 32-bit user-config to
> >> user-config.jam when I do 32-bit compile and a 64-bit
> user-config to
> >> user-config.jam when I do a 64-bit compile, but this has always
> seemed
> >> to me to be kludgy even if it does work, and I am hoping that
> bjam has
> >> the ability to solve this without my kludge.
> >
> > Solved ! Evidently with 'using' rule for the various compilers
> and tools
> > I can add target alternatives in the requirements section and so can
> > have <address-model>32 and <address-model>64 to achieve my goal.
> I spoke too soon. Using the <address-model>32 and <address-model>64 as
> target alternatives in toolset 'using' statements does not work to
> distinguish 'using' statements with the same name and version.
> Instead I
> get from Boost Build the error of:
> error: duplicate initialization of xxx with the following parameters
> etc.
> for toolset 'xxx', as in
> using xxx : nnn : some_command : <address-model>32 ;
> using xxx : nnn : some_other_command : <address-model>64 ;
> I guess I must go back to my original kludge as there seems to be no
> way
> to have Boost Build pick out the correct toolset based on whether I am
> compiling with a 32-bit or 64-bit address model.
> You can add a global toolset requirement to do that selection. Some
> toolsets initializations take those extra arguments and apply it. For
> example:
> using gcc : : c++ -fx32 : : <address-model>32 ;
> But the common ones don't have that, yet. Instead you can go the post
> init route:
> using toolset ;
> using clang : 9.1 : g++ ;
> toolset.add-requirements
> <toolset>clang,<address-model>32:<toolset-clang:version>9.1 ;
> The syntax for that long requirements might need some tweaking for your
> use case.

I think you meant to write above

import toolset ;

instead of

using toolset ;

or am I wrong ?

Also the syntax in your example for the add-requirements looks strange
considering it is trying to add <address-model>32 to the clang toolset
with version 9.1. Is it really correct as you specified it ? I would
have guessed logically, without actually knowing the syntax, the order
of the parameter would be:

<toolset>clang,<toolset-clang:version>9.1:<address-model>32 ;

in order to say that for toolset clang with version 9.1 add the
requirement for a 32-bit address model. But what do I know ? Is there
any doc on what a 'requirement', in the toolset add-requirements rule,
is supposed to look like ?

Also if I have, using my OP examples above:

using xxx : nnn : some_command ;
using xxx : nnn : some_other_command ;

where both the toolset name and version are the same, and I want to add
the requirement <address-model>32 to the first and the <address-model>64
to the second, do I achieve this by invoking toolset.add-requirements
with each different address model directly after each one, as in:

using xxx : nnn : some_command ;
toolset.add-requirements with <address-model>32 etc.
using xxx : nnn : some_other_command ;
toolset.add-requirements with <address-model>64 etc.

Thanks very much for your help !

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