Can clang compile 64-bit code?

[wjk]

I was trying to manually compile some code as 64-bit, but when I pass the -m64 flag to WinObjC clang, it fails with the following error:

failed to load c2 (file not found)

It seems that the MSVC 64-bit backend is missing. However, the rest of my project is also marked as 64-bit (using the MSBuild $(Platform) variable), and compiles just fine. What is going on here? Is there another flag I need to pass to Clang to get it to compile correctly as 64-bit?

[wjk]

As it turns out, none of my code is compiled as 64-bit. Even though the MSBuild $(Platform) variable was set to x64, inspecting the resulting object files using dumpbin.exe reveals that they are compiled as x86. It seems that none of the compiler toolchain supports 64-bit executables. @s5msft @jmsaunders-ms is there any way to change this?

[jmsaunders-ms]

You're right, clang/c2 for Objective-C does not presently support codegen for x64. This is something we're aware of. ARM support and optimizations have higher priority than x64 code generation, so I would expect to see support after those.

[DHowett-MSFT]

Clang can now do this, but the rest of WinObjC can't!