onqtam onqtam - 9 months ago 285
C++ Question

Problems generating solution for VS 2017 with CMake

So I installed Visual Studio 2017 yesterday. I also installed CMake 3.7.2 which supports VS 2017.

My VS installation is with the

Game development with C++
workflow + a few other components:

individual_components

I've also added the CMake stuff (but I don't think I even needed it - since I'm using CMake as a standalone tool to just generate the VS solutions) and MSBuild (I had
msbuild.exe
even before adding that component - so not sure what exactly does that additional component do).

With VS 2015 I was able to just run
cmake .
from a normal command prompt for a solution.

With VS 2017 the workflow changes - I've read this post from Microsoft.

So I tried the following:


  • I opened the
    Developer Command Prompt for VS 2017
    and from it I ran
    cmake . -G "NMake Makefiles"
    . Then running
    cmake --build .
    compiled everything properly.

  • When I tried the following in the prompt:
    cmake . -G "Visual Studio 15 2017 Win64"
    to force the creation of a solution I got the following errors:

    -- The C compiler identification is unknown
    -- The CXX compiler identification is unknown
    CMake Error at CMakeLists.txt:3 (project):
    No CMAKE_C_COMPILER could be found.
    CMake Error at CMakeLists.txt:3 (project):
    No CMAKE_CXX_COMPILER could be found.
    -- Configuring incomplete, errors occurred!



I also tried setting up the environment using vswhere.exe and running
vcvarsall.bat
like this:


"C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" amd64


and again I could only generate NMake files and not a solution.

So how can I get a solution?

And why does
cl.exe
report
Version 19.10.25017
when it's in
VC\Tools\MSVC\14.10.25017\bin
?

Answer Source

Turning my comments into an answer

The error -- The CXX compiler identification is unknown - No CMAKE_CXX_COMPILER could be found. basically means that CMake wasn't able to compile a simple test program (which it always does as part of identifying/validating the compiler).

You can take a look into CMakeFiles\CMakeError.log (relative to your binary output directory), the error reason should be in there.

Two possible reasons I came across so far:

  1. Missing administrator rights. You can try running this again from a shell that has administrative rights to crosscheck if your Visual Studio was setup with the need for administrator rights.

  2. Missing Windows SDK. Verify your SDK installation e.g. check that you have any Resource Compiler installed. It should be in a path similar to:

    C:\Program Files (x86)\Microsoft SDKs\Windows\v[some version]\bin\RC.Exe
    

Visual Studio 2017 Installation

Please note the Visual Studio may not install all necessary C++ packages even when you select one of the C++ pre-defined packages (as I have e.g. used Desktop development with C++ and then added more packages under the Individual Components tab).

Here is which selection worked for me (VS2017 Community Edition, Windows 10):

enter image description here

If you have projects using MFC/ATL libraries you need to add it under SDKs, libraries, and frameworks subcategory:

enter image description here

References