[Boost-build] B2 seems to seeking mt.exe at the wrong location (without the windows kits number)?

From: pbristow_at_[hidden]
Date: 2019-07-24 11:47:13

I am using 

VS 2019 version 16.20 preview 4.0  (current) 

I:\boost\libs\hello_boost\example>b2 -v
B2 Version 4.0. OS=NT.
  Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
  Copyright 2001 David Turner.
  Copyright 2001-2004 David Abrahams.
  Copyright 2002-2019 Rene Rivera.
  Copyright 2003-2015 Vladimir Prus.

  DEFAULTS: jobs = 16

I am using a jamfile and a .bat file that has worked before, but working on
nearly current GIT develop.

But something seems to have changed so that clang-win no longer works, failing
at the link.

I:\boost\libs\hello_boost\example>b2  -j16  toolset=clang-win-8.0.0
address-model=64 architecture=x86 release

warning: Did not find command for MSVC toolset. If you have Visual Studio 2017
installed you will need to specify the full path to the command, set
VS150COMNTOOLS for your installation, or build from the 'Visual Studio Command
Prompt for VS 2017'.

(I have ignored these warnings without trouble before).

Output of the link is:

Performing configuration checks

    - default address-model    : 32-bit (cached)
    - default architecture     : x86 (cached)
    - symlinks supported       : yes (cached)
    - BOOST_COMP_GNUC >= 4.3.0 : no  (cached)
...patience...
...found 2277 targets...
...updating 11 targets...
clang-win.link.dll
..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\threa
ding-multi\boost_system-clangw8-mt-x64-1_71.dll
msvc.manifest.dll
..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\threa
ding-multi\boost_system-clangw8-mt-x64-1_71.dll
'"C:\\Program Files (x86)\\Windows Kits\\10\\bin\x64\mt.exe"' is not recognized
as an internal or external command,
operable program or batch file.

        if exist
"..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\thre
ading-multi\boost_system-clangw8-mt-x64-1_71.dll.manifest" (
             "C:\\Program Files (x86)\\Windows Kits\\10\\bin\x64\mt.exe" -nologo
-manifest
"..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\thre
ading-multi\boost_system-clangw8-mt-x64-1_71.dll.manifest"
"-outputresource:..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\addre
ss-model-64\threading-multi\boost_system-clangw8-mt-x64-1_71.dll;2"
        )

...failed msvc.manifest.dll
..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\threa
ding-multi\boost_system-clangw8-mt-x64-1_71.dll
..\..\..\bin.v2\libs\system\build\clang-win-8.0.0\release\address-model-64\threa
ding-multi\boost_system-clangw8-mt-x64-1_71.lib...

Briefly:

Clang 8.0.0 compiles all OK, but fails to link missing right version of mt.exe

"C:\\Program Files (x86)\\Windows Kits\\10\\bin\x64\mt.exe"
 is missing the specification of the sub-folder

 currently \10.0.17763.0

 should be using

 "C:\Program Files (x86)\Windows Kits\10\bin\10.0.17763.0\x64\mt.exe"

What have I done to mess this up?

Paul

Paul A. Bristow
Prizet Farmhouse
Kendal, Cumbria 
LA8 8AB           UK