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[CMake] Add cross Windows to ARM Linux toolchain CMake cache file.
This cache file can be used to build a cross Windows to ARM Linux toolchain. Differential Revision: https://reviews.llvm.org/D69651
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‎clang/cmake/caches/CrossWinToARMLinux.cmake

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# CrossWinToARMLinux.cmake
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#
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# Set up a CMakeCache for a cross Windows to ARM Linux toolchain build.
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#
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# This cache file can be used to build a cross toolchain to ARM Linux
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# on Windows platform.
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#
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# NOTE: the build requires a development ARM Linux root filesystem to use
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# proper target platform depended library and header files.
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#
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# Configure:
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# cmake -G Ninja ^
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# -DCMAKE_INSTALL_PREFIX=../install ^
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# -DDEFAULT_SYSROOT=<path-to-develop-arm-linux-root-fs> ^
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# -DLLVM_AR=<llvm_obj_root>/bin/llvm-ar[.exe] ^
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# -DCMAKE_CXX_FLAGS="-D__OPTIMIZE__" ^
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# -C<llvm_src_root>/llvm-project/clang/caches/CrossWinToARMLinux.cmake ^
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# <llvm_src_root>/llvm-project/llvm
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# Build:
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# cmake --build . --target install
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# Test:
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# cmake --build . --target check-llvm
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# cmake --build . --target check-clang
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# cmake --build . --target check-lld
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if (NOT DEFINED DEFAULT_SYSROOT)
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message(WARNING "DEFAULT_SYSROOT must be specified for the cross toolchain build.")
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endif()
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if (DEFINED LLVM_AR)
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set(CMAKE_AR "${LLVM_AR}" CACHE STRING "")
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endif()
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if (NOT DEFINED LLVM_TARGETS_TO_BUILD)
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set(LLVM_TARGETS_TO_BUILD "ARM" CACHE STRING "")
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endif()
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if (NOT DEFINED CMAKE_C_COMPILER_TARGET)
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# Required if COMPILER_RT_DEFAULT_TARGET_ONLY is ON
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set(CMAKE_C_COMPILER_TARGET "armv7-linux-gnueabihf" CACHE STRING "")
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endif()
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if (NOT DEFINED CMAKE_BUILD_TYPE)
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set(CMAKE_BUILD_TYPE "Release" CACHE STRING "")
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endif()
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set(CMAKE_CROSSCOMPILING ON CACHE BOOL "")
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set(CMAKE_CL_SHOWINCLUDES_PREFIX "Note: including file: " CACHE STRING "")
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set(LLVM_ENABLE_ASSERTIONS ON CACHE BOOL "")
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set(LLVM_ENABLE_PROJECTS "clang;clang-tools-extra;lld" CACHE STRING "")
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set(LLVM_ENABLE_RUNTIMES "compiler-rt;libunwind;libcxxabi;libcxx" CACHE STRING "")
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set(LLVM_DEFAULT_TARGET_TRIPLE "${CMAKE_C_COMPILER_TARGET}" CACHE STRING "")
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set(LLVM_TARGET_ARCH "${CMAKE_C_COMPILER_TARGET}" CACHE STRING "")
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set(LLVM_LIT_ARGS "-vv ${LLVM_LIT_ARGS}" CACHE STRING "" FORCE)
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set(CLANG_DEFAULT_LINKER "lld" CACHE STRING "")
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set(COMPILER_RT_BUILD_BUILTINS ON CACHE BOOL "")
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set(COMPILER_RT_BUILD_SANITIZERS OFF CACHE BOOL "")
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set(COMPILER_RT_BUILD_XRAY OFF CACHE BOOL "")
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set(COMPILER_RT_BUILD_LIBFUZZER OFF CACHE BOOL "")
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set(COMPILER_RT_BUILD_PROFILE OFF CACHE BOOL "")
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set(COMPILER_RT_DEFAULT_TARGET_ONLY ON CACHE BOOL "")
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set(LIBUNWIND_USE_COMPILER_RT ON CACHE BOOL "")
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set(LIBUNWIND_TARGET_TRIPLE "${CMAKE_C_COMPILER_TARGET}" CACHE STRING "")
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set(LIBUNWIND_SYSROOT "${DEFAULT_SYSROOT}" CACHE STRING "")
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set(LIBUNWIND_ENABLE_SHARED OFF CACHE BOOL "")
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set(LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
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set(LIBCXXABI_ENABLE_STATIC_UNWINDER ON CACHE BOOL "")
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set(LIBCXXABI_USE_COMPILER_RT ON CACHE BOOL "")
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set(LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS OFF CACHE BOOL "")
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set(LIBCXXABI_TARGET_TRIPLE "${CMAKE_C_COMPILER_TARGET}" CACHE STRING "")
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set(LIBCXXABI_SYSROOT "${DEFAULT_SYSROOT}" CACHE STRING "")
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set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
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set(LIBCXX_TARGET_TRIPLE "${CMAKE_C_COMPILER_TARGET}" CACHE STRING "")
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set(LIBCXX_SYSROOT "${DEFAULT_SYSROOT}" CACHE STRING "")
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set(BUILTINS_CMAKE_ARGS "-DCMAKE_SYSTEM_NAME=Linux;-DCMAKE_AR=${CMAKE_AR}" CACHE STRING "")
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set(RUNTIMES_CMAKE_ARGS "-DCMAKE_SYSTEM_NAME=Linux;-DCMAKE_AR=${CMAKE_AR}" CACHE STRING "")
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set(LLVM_INSTALL_TOOLCHAIN_ONLY ON CACHE BOOL "")
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set(LLVM_TOOLCHAIN_TOOLS
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llvm-ar
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llvm-cov
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llvm-cxxfilt
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llvm-dwarfdump
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llvm-lib
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llvm-nm
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llvm-objdump
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llvm-profdata
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llvm-ranlib
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llvm-readobj
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llvm-size
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llvm-symbolizer
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CACHE STRING "")
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set(LLVM_DISTRIBUTION_COMPONENTS
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clang
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lld
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LTO
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clang-format
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builtins
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runtimes
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${LLVM_TOOLCHAIN_TOOLS}
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CACHE STRING "")

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