Re: [Boost-build] Parallel builds and runs

From: David Abrahams (dave_at_[hidden])
Date: 2006-02-21 14:38:20

"Noel Belcourt" <kbelco_at_[hidden]> writes:

> On Feb 21, 2006, at 12:02 AM, Vladimir Prus wrote:
>
>> Hi Noel,
>> Essentially, you ask if Boost.Build supports MPI. I think nobody
>> ever tried, so we can't claim such support. However:
>>
>>> 1) compiling for MPI using the compiler wrapper scripts (mpicc,
>>> mpiCC)
>> If the question in replacing 'gcc' with 'mpicc' in command lines?
>
> Yes.
>
>> Well, you can specify a custom compiler name in 'gcc' invocation, or
>> you can inherit new "mpicc" toolset from gcc.jam and change it as
>> needed.
>
> Okay, I'll try this out.
>
>>> 2) honoring the requested <toolset> by loading the appropriate
>>> module(s)
>> I don't understand what you mean here, sorry.
>
> Sorry, I was a bit too terse.  Consider Darwin (Tiger actually) where
> I can have both gcc 3.3 and 4.0 compilers installed and can use the
> gcc_select command to swap which gcc compiler is picked up.  The
> ability to swap the default compiler is what I mean by loading a
> module.  On many of our systems, we have numerous compilers installed
> and need to load the appropriate compiler module(s) before we build.
>
> For example, if on Darwin I asked for a gcc 3.3 build but the last
> invocation of gcc_select left the 4.0 compilers as the defaults, would
> bjam detect that the wrong compilers were being run?  I guess my
> question is does bjam perform a version check on the compiler if the
> user has requested a specific compiler version?

I know that's a common configuration technique, but Boost.Build
doesn't work that way.  It's designed so you can build with as many
versions of the compiler as you like, in one invocation.  So you
should arrange your

       using gcc : ... ;

invocations in user-config.jam (or site-config.jam) so that they can
run the compilers without using gcc_select.  For example, my
user-config.jam contains:

  using gcc : 4.0.2 : /usr/local/gcc-4.0.2/bin/g++.exe ;

  using gcc : 3.4.4 ;  # this one is what you get when you just say
                       # "gcc" at the command line.

  using gcc : 4.0.0 : /usr/local/gcc-4.0.0/bin/g++.exe ;

  using gcc : 2.95 : /bin/g++-2.exe ;

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com