[Scons-dev] SCons building with MS Visual C++10 on 64-bit Windows.

[Gary Oberbrunner]

On Fri, Jun 15, 2012 at 11:12 AM, Edward d'Auvergne
<edward at nmr-relax.com> wrote:

>  If you like though, I

> can add a warning to my proposed changes through the

> SCons.Warnings.warn() system stating that scons is falling back to the

> 32-bit compiler.


Grumble... this is of course a good idea, EXCEPT that on Windows the
Visual Studio tools are run by default whether you're actually using
them or not.  So people using SCons for LaTeX (for example) would see
this warning, even though they don't care at all about C/C++ programs.
 We have a project to revamp how Tools are created and used which
would address this, but it's a big job.
(http://www.scons.org/wiki/PlatformToolConfigAlt and
http://www.scons.org/wiki/PlatformToolConfig)

It might be OK just to give your warning in the case where you're on a
64 bit system, so TARGET_ARCH has defaulted to 64 bit, but you have
only 32 bit MSVC (but say nothing if you have no MSVC at all).  But
perhaps it would be better to not default TARGET_ARCH so early, so we
could tell what the user's intent is -- if they don't specify
TARGET_ARCH, try all.  That's kind of what you're looking for, right?
(though in your particular case, you'd probably rather it never
produce a 64-bit build).

-- 
Gary