[llvm-dev] Requesting for help.

[Bruce Hoult via llvm-dev]

You say you want to compile for 64 bit ARM (and most of your settings show
that) but you have "-DLLVM_TARGETS_TO_BUILD=ARM".

32 bit ARM and 64 bit ARM are different and unrelated architectures.

Try

-DLLVM_TARGETS_TO_BUILD=AArch64


On Mon, Jul 23, 2018 at 5:04 AM, sumedh jambekar via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello All,
>
> I need some help with respect to cross compiling for ARM.
>
> While trying to cross compile for the ARM target, I am hitting some
> errors. I need some help in this.
>
> I use the following command to cross compile for ARM Cortex A72 (ARM
> v8-a), 64 bit architecture:
>
> *cmake -v CC='clang' CXX='clang++'
> -DCMAKE_C_COMPILER=../build_directory_llvm/bin/clang
> -DCMAKE_CXX_COMPILER=../build_directory_llvm/bin/clang++
> -DLLVM_TABLEGEN=../build_llvm_directory/bin/llvm-tblgen
> -DCLANG_TABLEGEN=../build_llvm_directory/bin/clang-tblgen
> -DCROSSCOMPILING=True -DCMAKE_INSTALL_PREFIX=../tmp_two
> -DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-linux-gnu -DLLVM_TARGET_ARCH=AARCH64
> -DLLVM_TARGETS_TO_BUILD=ARM -DCMAKE_CXX_FLAGS='-target aarch64-linux-gnu
> --sysroot=../myOwnToolChainTwo/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/aarch64-linux-gnu/libc
> --gcc-toolchain=../myOwnToolChainTwo/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/
> -mcpu=cortex-a72' -DLLVM_ENABLE_LIBCXX=ON -DLLVM_ENABLE_PIC=False ../llvm/*
>
>
> I hit the error stating that "*error: unable to create target: 'No
> available targets are compatible with this triple.*'"
>
> I am using ARMv8-a as my target which is 64 bit. Can you please let me
> know whether the target triple I am using is correct? Can you also please
> let me know whether I am using the right -mcpu option?
>
> Thanks,
> Sumedh
>
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>
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