[llvm-dev] bug: cross-compile Clang/LLVM for ARM using Clang/LLVM

[李阳 via llvm-dev]

Hi James,

1. I have tried with your suggestion, the command is as follows:

CC='clang' CXX='clang++' cmake -G Ninja ../llvm-source-code
-DCMAKE_CROSSCOMPILING=True
-DCMAKE_INSTALL_PREFIX=./llvm
-DLLVM_TABLEGEN=/home/lab/workspace/llvm/build4x86/bin/llvm-tblgen
-DCLANG_TABLEGEN=/home/lab/workspace/llvm/build4x86/bin/clang-tblgen
-DLLVM_DEFAULT_TARGET_TRIPLE=arm-linux-gnueabihf
-DLLVM_TARGET_ARCH=ARM -DLLVM_TARGETS_TO_BUILD=ARM
-DCMAKE_CXX_FLAGS='-target armv7a-linux-gnueabihf -mcpu=cortex-a9
--sysroot=/usr/arm-linux-gnueabihf/ -mfloat-abi=hard -ccc-gcc-name
arm-linux-gnueabihf-gcc'
-DLLVM_ENABLE_LIBCXX=ON -DLLVM_ENABLE_PIC=False

But it still produce error, like this:

CMake Error at
/home/lab/workspace/cmake-3.2.0-Linux-x86_64/share/cmake-3.2/Modules/CMakeTestCXXCompiler.cmake:54
(message):
  The C++ compiler "/home/lab/workspace/llvm/build4x86/bin/clang++" is not
  able to compile a simple test program.

/usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi

  Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 i386linux elf_l1om
  elf_k1om i386pep i386pe

  clang-3.9: error: linker command failed with exit code 1 (use -v to see
  invocation)

  ninja: build stopped: subcommand failed.

2. If I maually add all the libraries/headers, it don't produce the errors
above.

So I think I still need to download some necessary libraries.

Thanks for your reply!

Best,
Liyang

2016-04-25 23:42 GMT+08:00 James Molloy <james at jamesmolloy.co.uk>:

> You shouldn't need any. Did you attempt my suggestion ?
>
> On Mon, 25 Apr 2016 at 16:40, 李阳 <yanglee.cqu at gmail.com> wrote:
>
>> Hi James, renato,
>>
>> So how do I download the missing ARM libraries on Ubuntu14.04? I cannot
>> find any available libraries.
>>
>> Best,
>> Liyang
>>
>
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