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

[Michael Hartmann]

Hi Bill,

I’m using SCons 3.5 on Python 2.7.14.

Daniel,

You’re right, I’m using Express edition.

For Visual Studio 12 I have:
VC\bin\cl.exe
VC\bin\x86_amd64\cl.exe

VS 14.0:
VC\bin\cl.exe
VC\bin\x86_amd64\cl.exe

VS 2017:
bin\Hostx86\x86\cl.exe
bin\Hostx86\x64\cl.exe

So if I set HOST_ARCH (I guess that’s what you meant by HOST_PLATFORM?) to x86, I can get a build with 2017/14.1 to work, but not any earlier versions.

I guess the fix would be in _check_cl_exists_in_vc_dir():

if not host_trgt_dir:

“not host_trgt_dir” evaluates to True. A simple change to “if host_trgt_dir is None” should fix this.

After that change, cl.exe is found for older Visual Studio versions. However, Scons still doesn’t use the correct compiler. My SConstruct looks like this:

Env = Environment(TARGET_ARCH = 'x86',
    HOST_ARCH = 'x86',
    MSVC_VERSION = '12.0')

env.Object(“test.obj”, “test.c”)

SCons still insists on using VS 14.1, even after succesfully finding cl.exe for 12.0:
...
msvc_setup_env()
get_default_version()
get_default_version(): msvc_version:None msvs_version:None
installed_vcs:['14.1', '14.0', '12.0', '12.0Exp', '10.0', '10.0Exp', '9.0Exp']
msvc_setup_env: using default installed MSVC version '14.1'

msvc_setup_env: using specified MSVC version '14.1'
...

Michael

Von: Scons-users <scons-users-bounces at scons.org> Im Auftrag von Bill Deegan
Gesendet: Donnerstag, 28. März 2019 17:53
An: SCons users mailing list <scons-users at scons.org>
Betreff: Re: [Scons-users] MSVC is broken for x86 builds on x64 hosts

Michael,

Which version of SCons, which python?
Is something broken for you?
Or are you just asserting that the current logic is not correct?

-Bill

On Thu, Mar 28, 2019 at 7:04 AM Michael Hartmann <michael.hartmann at qtronic.de<mailto:michael.hartmann at qtronic.de>> wrote:
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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