[cmake] Only attempt to install MSVC system libraries on Windows
Newer versions of CMake (I'm on 3.10, but I believe 3.9 behaves the same
way) attempt to query the system for information about the VS 2017
install. Unfortunately, this query fails on non-Windows systems:
cmake_host_system_information does not recognize <key> VS_15_DIR
CMake isn't going to find these system libraries on non-Windows anyway
(and we were previously silencing the resultant warnings in our
cross-compilation toolchain), so it makes sense to just omit the
attempted installation entirely on non-Windows.
Differential Revision: https://reviews.llvm.org/D41220
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320724 91177308-0d34-0410-b5e6-96231b3b80d8
1 year, 10 months ago
# This allows us to deploy the Universal CRT DLLs by passing -DCMAKE_INSTALL_UCRT_LIBRARIES=ON to CMake
# control which libraries they require.
set(CMAKE_C_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)
set(CMAKE_CXX_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)
# CMake's InstallRequiredSystemLibraries module searches for a Visual Studio
# installation in order to determine where to copy the required DLLs. This
# installation won't exist when cross-compiling, of course, so silence the
# resulting warnings about missing libraries.