'inline' function definition for could not be written to module due to unrecognized expression or statement

Question

I am experimenting with MSVC and modules.

I have the following code:

module;
#include "windows.h"
export module Module;

When I compile it in Win32 configuration I get the following:

1>C:\Program Files (x86)\Windows Kits\10\Include\10.0.22000.0\um\winnt.h(1005,1): message : sorry: 'inline' function definition for 'ULONGLONG Int64ShllMod32(ULONGLONG,DWORD)' could not be written to module due to unrecognized expression or statement at 'C:\Program Files (x86)\Windows Kits\10\Include\10.0.22000.0\um\winnt.h(1010,5)'.
1>If possible please provide a repro here: https://developercommunity.visualstudio.com

The same happens for functions LONGLONG Int64ShraMod32(LONGLONG,DWORD) and ULONGLONG Int64ShrlMod32(ULONGLONG,DWORD).

The message does not show in x64 configuration.

So I would like to know:

• Why the message comes out?
• If it is safe to suppress it, how can I suppress it?

I am using Visual Studio 2022 version 17.5.0 (v143) and compiling with /std:c++20.

Answer 1

I have encountered a similar accident to the problem you are having, so I am not sure if it will be helpful, but I will try to answer.

... In my case, it happened when I created the project using Visual Studio. According to that, the compiler may recognize the header file as a target for compilation. The proof is in the .vcproj included in the solution.

<ClCompile Include="srcfile.cpp" />

"srcfile.cpp" written in vcproj must contain only the source file. If a header file is included here, the compiler will compile it and look for 'inline' functions. Therefore, the following example is NG.

<ClCompile Include="srcfile.h" />

The header file needs to be rewritten as below and included in the nearby chunk.

<ClInclude Include="srcfile.h" />

My point may be wrong, or the problem in the title may be caused by another reason. Also, I'm Japanese and don't understand English very well. sorry.