Building cmake in a temporary directory fails because the checks in [Source/Checks/cm_cxx_features.cmake](https://gitlab.kitware.com/cmake/cmake/-/tree/master/Source/Checks) considers all warnings an error. A warning is emitted when building in a temporary directory (cwd in `%TMP%/%TMP%/%TMPDIR%`). This is because msbuild/msvc is emitting the following `MSB` warning: ``` C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppBuild.targets(467,5): warning MSB8029: The Intermediate directory or Output directory cannot reside under the Temporary directory as it could lead to issues with incremental build. [C:\J\w\cci_PR-3053@2\.conan\data\cmake\3.16.2\_\_\build\a79a557254fabcb77849dd623fed97c9c5ab7651\CMakeFiles\CMakeTmp\cmTC_3d17c.vcxproj] ``` I think a check should be added to [Source/Checks/cm_cxx_features.cmake](https://gitlab.kitware.com/cmake/cmake/-/tree/master/Source/Checks) to ignore all messages containing `warning MSB[0-9]{4}`. This error was detected while building conan on the ci of conan-center-index (c3i): see https://github.com/conan-io/conan-center-index/pull/3053 It can be argued that the error is due to the c3i configuration. I believe that a benign thing such as changing directory to a temporary directory should not be able to break a build. Thanks