Should WindowsToolchain set '/X' MSVC flag?

[redbaron]

It feels like it would be safer to set "/X" to guarantee that nothing from env vars (like VS command prompt or CLion on Windows) leaks into build process.

[MarkSchofield]

That’s a great idea. I wasn’t aware of that option.

[redbaron]

Sadly I didn't find anything like that for linker's LIB env var. In theory CMake allows unset($ENV{LIB}) , but IDK if it just clears $ENV or it truly propagates to spawned processes like compilers and linkers.

[redbaron]

This way to clear LIB env vars works for me:

set(CMAKE_CXX_LINKER_LAUNCHER ${CMAKE_COMMAND} -E env --unset=LIB --unset=LIBPATH --)