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[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
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@ -1010,7 +1010,7 @@ if(LLVM_DISTRIBUTION_COMPONENTS)
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endif()
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# This allows us to deploy the Universal CRT DLLs by passing -DCMAKE_INSTALL_UCRT_LIBRARIES=ON to CMake
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if (MSVC)
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if (MSVC AND CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
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include(InstallRequiredSystemLibraries)
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endif()
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@ -299,10 +299,3 @@ set(CMAKE_SHARED_LINKER_FLAGS "${_CMAKE_SHARED_LINKER_FLAGS_INITIAL} ${LINK_FLAG
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# control which libraries they require.
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set(CMAKE_C_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)
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set(CMAKE_CXX_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)
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# CMake's InstallRequiredSystemLibraries module searches for a Visual Studio
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# installation in order to determine where to copy the required DLLs. This
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# installation won't exist when cross-compiling, of course, so silence the
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# resulting warnings about missing libraries.
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set(CMAKE_INSTALL_SYSTEM_RUNTIME_LIBS_NO_WARNINGS ON)
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