Force SCons to use 32-bit MSVC compiler on 64-bit Windows

[nneesshh]

See https://stackoverflow.com/questions/24810474/force-scons-to-use-32-bit-msvc-compiler-on-64-bit-windows

I encounted the same bug: I want scons to use x86 version "cl.exe", but it always use x64 version "cl.exe".
When I modified the "C:\Python27\scons-3.0.1\SCons\Environment.py" line 950

form "self._dict['TARGET_ARCH'] = self._dict.get('TARGET_ARCH',None)" to "self._dict['TARGET_ARCH'] = self._dict.get('TARGET_ARCH','x86')"

It use x86 version "cl.exe" now.

[bdbaddog]

This is not a bug.
It's by design.
And you're using TARGET_ARCH incorrectly.

You should set it in each Environment() you want to force a specific (non-native) target for MSVC compiles.

This is the correct answer to that stackoverflow question:
https://stackoverflow.com/a/26592583/82681

Closing.