Re: [Boost-build] Target alternatives and multiple compilers - again

Subject: Re: [Boost-build] Target alternatives and multiple compilers - again
From: Jürgen Hunold (juergen.hunold_at_[hidden])
Date: 2011-07-12 14:05:23

Hi Edward,

On Tuesday, 12. July 2011 17:54:58 Edward Diener wrote:
> That does not work either. If I change the above to:
> 
> test-suite somelib
> 
>           [ compile some_source.cpp ]
>     ;
> 
> test-suite  somelib_gcc
> 
>          [ compile  some_source.cpp
> 
>            :  <cxxflags>-std=c++0x
>            :  some_source_gcc
> 
>          ]
> 
>     <toolset-gcc:version>4.3.0
>     <toolset-gcc:version>4.4.0
>     <toolset-gcc:version>4.5.0
>     <toolset-gcc:version>4.5.2
>     <toolset-gcc:version>4.6.0
>     ;
> 
> test-suite somelib_gcc ;
> 
> change some_source.cpp, and execute the jamfile for gcc-4.6.0,
> some_source_gcc never gets created even though some_source does.

My fault. The requirement list above means that _all_ requirements must be 
met. The requirements are implicit "and" composited. And as far as I know, 
there is no "or"-able syntax.

> > A more stable solution would be to query the compile in a conditional
> > rule.
> 
> I simply want to have a target alternative for multiple compilers.

It is not easy. You could try:

 <toolset-gcc:version>4.3.0:<cxxflags>-std=c++0x 

but I doubt you will get far.

> Surely this can not need some rule-based programming.

Yes, especially because the toolset version can be arbitrary complex.

I have "gcc-4.2~arm" for cross-platform arm, maybe gcc-4.6~arm next month.

And I usually shorten compiler version to "4.5." instead of 4.5.2. So it gets 
complicated quite fast:

Working example:

import testing ;

test-suite somelib
    :
          [ compile some_source.cpp ]
    ;

test-suite  somelib_gcc
    :
         [ compile  some_source.cpp
           :  <cxxflags>-std=c++0x
           :  some_source_gcc
         ]
    :
        <conditional>@gcc-conditional
    ;

rule gcc-conditional ( properties * )
{
    # Extract version number from toolset
    local version = [ MATCH "<toolset.*version>([0-9.]+).*"
        : $(properties) ] ;

    if $(version) < "4.3.0"
    {
       result += <build>no ;
    }
}

This really gets useful if you have version dependent flags which you want to 
control. 

Off to vacation,

Yours,

Jürgen
-- 
* Dipl.-Math. Jürgen Hunold       ! Ingenieurgesellschaft für 
* voice: ++49 511 262926 57       ! Verkehrs- und Eisenbahnwesen mbH  
* fax  : ++49 511 262926 99       ! Lister Straße 15
* juergen.hunold_at_[hidden]        ! www.ivembh.de
* 
* Geschäftsführer:                ! Sitz des Unternehmens: Hannover
* Prof. Dr.-Ing. Thomas Siefer    ! Amtsgericht Hannover, HRB 56965
* PD Dr.-Ing. Alfons Radtke       !