diff --git a/llvm/docs/HowToCrossCompileLLVM.rst b/llvm/docs/HowToCrossCompileLLVM.rst index 258d3a2eab6fce..1e6f74b144aae2 100644 --- a/llvm/docs/HowToCrossCompileLLVM.rst +++ b/llvm/docs/HowToCrossCompileLLVM.rst @@ -43,12 +43,16 @@ The CMake options you need to add are: * ``-DCMAKE_SYSTEM_NAME=`` * ``-DCMAKE_INSTALL_PREFIX=`` * ``-DLLVM_NATIVE_TOOL_DIR=`` - * ``-DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf`` - * ``-DLLVM_TARGET_ARCH=ARM`` + * ``-DLLVM_HOST_TRIPLE=arm-linux-gnueabihf`` * ``-DLLVM_TARGETS_TO_BUILD=ARM`` Note: ``CMAKE_CROSSCOMPILING`` is always set automatically when ``CMAKE_SYSTEM_NAME`` is set. Don't put ``-DCMAKE_CROSSCOMPILING=TRUE`` in your options. +Also note that ``LLVM_HOST_TRIPLE`` specifies the triple of the system +that the cross built LLVM is going to run on - the flag is named based +on the autoconf build/host/target nomenclature. (This flag implicitly sets +other defaults, such as ``LLVM_DEFAULT_TARGET_TRIPLE``.) + If you're compiling with GCC, you can use architecture options for your target, and the compiler driver will detect everything that it needs: