unable to compile with VS2022 Preview 7 with std=c++latest using modules and building with clang

Question

unable to compile with VS2022 Preview 7 with std=c++latest using modules and building with clang

Juan Dent 236

Compiling a static library of modules (extension .ixx) with clang inside VS2022 17.6.0 Preview 7.0 I get this error:

clang-cl : error : no such file or directory: '/scanDependencies'

What is going on?

Viorel 122.5K Reputation points

2023-05-14T17:19:49.4833333+00:00

The MSVC compiler has a “/scanDependencies” command line option. Maybe it is not valid for clang.
Juan Dent 236 Reputation points

2023-05-14T21:09:42.3733333+00:00

is there a way to remove that command line option?

3 answers

Your answer

Viorel 122.5K Reputation points

2023-05-14T17:19:49.4833333+00:00

The MSVC compiler has a “/scanDependencies” command line option. Maybe it is not valid for clang.
Juan Dent 236 Reputation points

2023-05-14T21:09:42.3733333+00:00

is there a way to remove that command line option?

Answer 1

Minxin Yu 13,501 Microsoft External Staff

Hi, @Juan Dent

From the report: clang-cl’ not support C++ 20 modules.
I didn't find information about clang supporting module in Visual Studio release notes.

Best regards,

Minxin Yu

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Minxin Yu 13,501 Reputation points Microsoft External Staff

2023-05-25T07:38:00.5933333+00:00

Hi, @Juan Dent May I know if you have got any chance to check my answer?
TomieAi 10 Reputation points

2023-06-14T00:31:31.12+00:00
if only you guys update Clang regularly or monthly.. it will be nice.. modules are supported at Clang 17. but please tell us how to remove

1>clang-cl : error : no such file or directory: '/scanDependencies' 1>clang-cl : error : no such file or directory: '/interface'

on the command line, I don't even use modules. I just want to test the latest one above c++20
TomieAi 10 Reputation points

2023-06-14T00:40:02.38+00:00
even without using modules, the error occurred. if u use c++20 above. this update breaks it. where exactly are these folders? I tried to make this folder on my source but no luck.

1>clang-cl : error : no such file or directory: '/scanDependencies' 1>clang-cl : error : no such file or directory: '/scanDependencies' 1>clang-cl : error : no such file or directory: '/interface' 1>clang-cl : error : no such file or directory: '/interface'

Answer 2

Thomas Lyons 0

I upgraded to the release candidate of Clang 17.0.0. Still getting this error in Visual Studio. I make no use of modules. This has completely broken clang in Visual Studio 2022 for me.

Thomas Lyons 0 Reputation points

2023-08-07T17:41:49.0733333+00:00

I fixed the problem.
In all of my projects, under Project Properties->C++->All Options
Change "Build ISO C++23 Standard Library Modules" to "No"

Answer 3

l t 0

same here, i just cannot understand that. I reported this as issue at the microsoft support (issue) but apparently its low priority.

However the error changed, its now just "Module file not found". You can add every file manually via the command line i guess but apparently that requires multiple build steps etc.

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unable to compile with VS2022 Preview 7 with std=c++latest using modules and building with clang

3 answers

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