[Scons-users] MSVC is broken for x86 builds on x64 hosts

[Michael Hartmann]

The code to support Visual Studio tries to construct a path to cl.exe form the host arch (amd64) and the target arch (x86):

vc.py:get_host_target()
vc.py:get_host_target() req_target_platform:x86
_check_cl_exists_in_vc_dir(): host platform amd64, target platform x86
_check_cl_exists_in_vc_dir(): checking for cl.exe at C:\Program Files (x86)\Microsoft Visual Studio\2017\WDExpress\VC\Tools\MSVC\14.14.26428\bin\Hostx64\x86\cl.exe
find_vc_pdir no compiler found 14.1
trying to find VC 14.0
find_vc_dir(): found VC in registry: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\
found VC 14.0
vc.py:get_host_target()
vc.py:get_host_target() req_target_platform:x86
_check_cl_exists_in_vc_dir(): host platform amd64, target platform x86
_check_cl_exists_in_vc_dir(): checking for cl.exe at C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64_x86\cl.exe
find_vc_pdir no compiler found 14.0
trying to find VC 14.0Exp
find_vc_dir(): no VC registry key 'Microsoft\\VCExpress\\14.0\\Setup\\VC\\ProductDir'
find_vc_pdir return None for ver 14.0Exp

The problem is: Visual Studio is always a x86 application. The compiler for a x86 target is not a cross compiler and is found in VC\bin, not VC\bin\amd64_x86.
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