Need ARM64 Supported

[flyingbird]

Need ARM64 Supported
Thanks.

[cryptopathe]

You'll have to wait that Apple releases its own Aarch64 backend, please see http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-September/065480.html for more information.

[mmozeiko]

I'm pretty sure you can use AArch64 backend which is currently in 3.4 release - that includes assembler, disassembler and all the other llvm infrastructure (TargetDesc, etc..).

[flyingbird]

@mmozeiko I use clang in llvm-3.4 with "-arch aarch64".
but it does not recognize this architecture.
how to compile?
Thanks.

[pyknite]

You can use 'llvm-config --targets-build' to see which targets are supported by your compiler.

I got those by default:
AArch64 ARM CppBackend Hexagon Mips MSP430 NVPTX PowerPC R600 Sparc SystemZ X86 XCore

If your compiling from a non darwin plateform, you should use the '-target' flag instead of '-arch' also.

[flyingbird]

@pyknite
When i type "llvm-config --targets-built", it list
AArch64 ARM CppBackend Hexagon Mips MSP430 NVPTX PowerPC R600 Sparc SystemZ X86 XCore

Both of '-target' and '-arch' not work.
use -arch. it says "clang-3.2: error: invalid arch name '-arch AArch64'"
use -target. it says "error: unknown target triple 'AArch64', please use -triple or -arch"

I'm using mac osx 10.8.5

[cryptopathe]

clang-3.2 does not refer to ollvm 3.4 ?! Did you compile the proper ollvm branch?

Furthermore, --target=aarch64 works for me (watch the capital letters). To be more precise, ollvm 3.4 accepts the flag, as expected, and outputs arm64 assembler.

[flyingbird]

@cryptopathe can you show me the whole command line.
Thanks.
I try:
./clang --target=aarch64 *.cpp -o a.out
It says:
/var/folders/xm/y_r68c696gj03myrrjbr4q440000gn/T/main-4fe436.s:4:2: error: unknown directive
.type main,@function

[cryptopathe]

This error message means that the assembler cannot handle arm64 assembly. All the compilation process went OK, but you lacks an arm64 assembler.

In order to be able to generate working binaries, I guess you have to install a complete and properly working cross-compilation environment (see for instance http://stackoverflow.com/questions/20745412/building-the-botan-library-for-ios7-arm64).

By the way, if you would like to integrate ollvm into Xcode, this link might help you. Even if it targets Xcode 3&4, I guess that the principles have not changed much for Xcode 5: http://belkadan.com/blog/2011/07/Using-Clang-from-SVN-in-Xcode/