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

[Kyle J Strand]

I'm not sure--it actually seems like a poor assumption to me to think that 
all (or even most) users with 64 bit host architectures probably want to 
target (exclusively) 64 bit architectures, and as previously noted, the 
error SCons gives when it doesn't find a 64-bit compiler installed is not 
really very helpful at all. This was one of the first issues I ran into 
when trying to use SCons, and I honestly think I just got lucky in 
figuring out early on that I could fix it by specifying TARGET_ARCH or 
installing 64-bit compiler components.

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Kyle Strand, Software Intern
Beckman Coulter, Inc., Life Sciences Division
4862 Innovation Drive, Fort Collins, Colorado, 80525
(970) 204-7036



"Kenny, Jason L" <jason.l.kenny at intel.com> 
Sent by: scons-dev-bounces at scons.org
06/15/2012 10:23 AM
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Re: [Scons-dev] SCons building with MS Visual C++10 on  64-bit  Windows.






I recall chiming in on this. As I help a bit with this rewrite.

I honestly found it better to be precise and error out if that is not the 
case. The difference is for example in the Parts addon you would say this:

Scons mytarget

Just like you would with scons. The difference is that this builds 64-bit 
on a 64-bit system and 32-bit on a 32-bit system. If the compiler is not 
installed you get this type of message:

scons: *** Version of 10 of MSVC not found for target win32-x86_64. Found 
version are ['9.0']
File "C:\Users\jlkenny\code\parts\parts\__init__.py", line 7, in <module>

As in this case the system does not have vc 2010 64-bit install, but it 
does have 9 versions.

If you want to build 32-bit you would say:

scons --target=x86 mytarget

and it would work. If I then want to do a 32-bit vc 9 you would say:

scons --target=x86 --tool-chain=cl_9

The main point here is that while it is great the scons tries to find a 
compiler, I don't believe it should try to cross build for you 
automatically. That part should be clear.

Given the current SCons code the user should be able to say:

scons mytarget TARGET_ARCH=x86

and get a 32-bit build vs a 64-bit one.

Jason 
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