wrong platform toolset

[aregtech]

Describe:

Configuring CMake for Clang under Windows with following command

cmake -B ./product/cache/msvc-clang-x86 -DAREG_PROCESSOR=x86 -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl

When configuration finished, the generated project files (.vcxproj) contain wrong toolset:

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseOfMfc>false</UseOfMfc>
    <CharacterSet>Unicode</CharacterSet>
    <PlatformToolset>v143</PlatformToolset>
  </PropertyGroup>

The specified <PlatformToolset>v143</PlatformToolset> should be <PlatformToolset>ClangCl</PlatformToolset>. In addition, I get compilation error because the MSVC does not understand Clang specific compiler option to disable warnings like -Wno-c++98-compat.

It differs if configure with command:

cmake -B ./product/cache/msvc-clang-x86 -DAREG_COMPILER_FAMILY=llvm -DAREG_PROCESSOR=x86

This call generates correct PlatformToolset entry.

Expected:

Two commands:

cmake -B ./product/cache/msvc-clang-x86 -DAREG_PROCESSOR=x86 -DCMAKE_CXX_COMPILER=clang-cl -DCMAKE_C_COMPILER=clang-cl

and

cmake -B ./product/cache/msvc-clang-x86 -DAREG_COMPILER_FAMILY=llvm -DAREG_PROCESSOR=x86

should generate absolutely identical project files to build 32-bit binaries and the PlatformToolset should be ClangCl