ntwin32.mak not found - R2018b w/ Visual Studio 2017 Pro

I am building for a target in R2108b (9.5.0.944444) with Microsoft Visual C++ 2017 (C) set up as my compiler. I have the Windows SDK v7 and v10 installed. The ntwin32.mak file is located where it should be in the include folder for the v7 SDK. When building the model it eventually aborts:

### Building FullEHStrRTW_Model: .\FullEHStrRTW_Model.bat
...... 
C:\Dater\FullEHStrCoSim_Subsys_v00\FullEHStrRTW_Model_dyn_rtw>set "VSCMD_START_DIR=C:\Dater\FullEHStrCoSim_Subsys_v00\FullEHStrRTW_Model_dyn_rtw"  
 
C:\Dater\FullEHStrCoSim_Subsys_v00\FullEHStrRTW_Model_dyn_rtw>call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Auxiliary\Build\VCVARSALL.BAT " amd64  
********************************************************************** 
** Visual Studio 2017 Developer Command Prompt v15.9.15 
** Copyright (c) 2017 Microsoft Corporation 
**********************************************************************
[vcvarsall.bat] Environment initialized for: 'x64' 
 
Microsoft (R) Program Maintenance Utility Version 14.16.27032.1 
Copyright (C) Microsoft Corporation.  All rights reserved.
C:\PROGRA~1\MATLAB\R2018b\rtw\c\tools\vctools.mak(18) : fatal error U1052: file 'ntwin32.mak' not found
Stop.
The make command returned an error of 2
'An_error_occurred_during_the_call_to_make' is not recognized as an internal or external command,
operable program or batch file.

I have reinstalled basically everything and still get stuck here. Any thoughts?

Answer 1

[Fangjun Jiang]

Run "mex -setup" and follow instructions.

[Joshua Mason]

mex -setup
MEX configured to use 'Microsoft Visual C++ 2017 (C)' for C language compilation.

I've run mex -setup numerous times; it always correctly identifies the compiler.

[Fangjun Jiang]

You might want to check that the ntwin32.mak file needs to exist in both these two folders:

C:\Program Files\Microsoft SDKs\Windows\v7.1\Include

C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include

[Joshua Mason]

Can confirm it is present in both locations. If I use an older version of Matlab, say R2017b and set the C compiler to the Microsoft Windows 7 SDK it compiles fine in both 32 bit and 64 bit. It's only when I try to use Visual Studio as my compiler (doesn't matter which version of Matlab I use - I've tried 14b,17b,18b, and 19a) that I get this error. Unfortunately Windows 7 SDK is not a supported compiler in either of the Matlab versions my source files are being authored in so it won't solve my problem to just compile using the Windows 7 SDK. I also can't use MinGW because the .tlc I'm using is not compatible.

[Fangjun Jiang]

In your "Code Generation" configurations, select the "Automatically located an installed toolchain" or try "MVC++2017 ... nmaker (64-bit Windows)"

[Joshua Mason]

I don't see any of those options anywhere within the "Code Generation" configurations.

Answer 2

[Joshua Mason]

I manually edited vctools.mak:

From:

!include <ntwin32.mak>

to:

!include C:\Program Files\Microsoft SDKs\Windows\v7.1\Include\ntwin32.mak

and it will build fine. I have added the directory to the matlab path and the environments variable PATH and neither seem to allow the vctools.mak reference work.

Answer 3

[Joshua Mason]

Similarly if I add 17.0 to the or statement on Visual studio version check:

!if "$(VISUAL_VER)" == "11.0" || "$(VISUAL_VER)" == "12.0" || "$(VISUAL_VER)" == "14.0" || "$(VISUAL_VER)" == "15.0" || "$(VISUAL_VER)" == "17.0"

This will also result in a compiled .dll.