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While doing a DLL dependency analysis of my C++ application, I noticed that msvcp140.dll and concrt140.dll from the Microsoft Visual C++ 2015-2022 Redistributable (x64) have a odd dependency relationship. concrt140.dll lists msvcp140.dll in its import directory table, while msvcp140.dll lists concrt140.dll in its delay import directory table. This suggests that msvcp140.dll is a hard dependency of concrt140.dll, while concrt140.dll is a soft dependency of msvcp140.dll. What's the reason behind such a dependency relationship? This is the only time I've ever seen two DLLs that depend on each other.
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Is your problem solved? Can you give some screenshots?
I just installed the Microsoft Visual C++ 2015-2022 Redistributable (x64) and did not observe the imports/dependencies mentioned.
The above were produced by dumpbin.exe from the files installed by the version 14.34.31938.0 x64 redist.
Huh. It looks like only some versions of msvcp140.dll have the delay-load dependency on concrt140.dll. Version 14.27.29016.0 shows the following according to the Dependencies tool.
If you look at the images that I posted both DLLs that I checked were located in the system32 folder. However, the image above shows that you looked at the msvcp140.dll file residing in the "C:\Program Files\Java\jdk-16\bin" folder.
The one I posted is just one example of msvcp140.dll having a delay-load dependency on concrt140.dll. There are many versions of msvcp140.dll that have been released, and I have found that some of them have this dependency and some don't. Here's one more version that does have this dependency.
Regardless of the reason for the dependency relationship, I suspect that only a Microsoft developer who works on the Visual C++ runtime library can answer my question. It's not critical to know why this dependency exists for some versions of msvcp140.dll; it was just a curiosity that I was hoping someone could answer.
(deleted duplicate comment)
For what its worth, the copy of msvcp140.dll in the VS2022 IDE folder is the VS2017 version -
The delay load for concrt140.dll relates to the following imports-
And yes, only Microsoft can provide the reasons for these choices.
One possible reason for the VS2017 msvcp140.dll (STL) delay load dependency on imports from concrt140.dll (concurrency runtime) is to support Windows XP. VS2017 was the last version of VS that supports XP and the docs at Concurrency Runtime implementation history say "Also, the STL requires this DLL on Windows XP to power synchronization primitives, because Windows XP does not have condition variables."