[LLVMdev] Support for Windows Phone 8.1

[Nick Lewycky]

Damanjit Singh wrote:
> Thanks Saleem, Nick.
>
> I will try with the latest code and share the results.
>
> Though, just curious if I need to really use clang to generate the
> object file and the current steps won't work? I ask because using .c
> file was only an illustration. For my project the IR is not generated
> from .c files or clang.

You don't need to use clang. When you use clang you have to tell it what 
target it's targeting.

If you're starting with IR, try "llc -filetype=obj foo.bc -o foo.obj 
-mtriple=..." to produce a .o file directly. I'm not experienced with it 
myself but I've heard that MSVC will produce assembly that it can't 
parse, so it's probably a good idea to leave assembly out of the 
equation when targeting Windows.

Nick

> On 08-Jun-2014, at 11:00 am, "Saleem Abdulrasool" <compnerd at compnerd.org
> <mailto:compnerd at compnerd.org>> wrote:
>
>> On Sat, Jun 7, 2014 at 4:49 PM, Nick Lewycky <nicholas at mxc.ca
>> <mailto:nicholas at mxc.ca>> wrote:
>>
>>     Damanjit Singh wrote:
>>
>>         Hi guys,
>>
>>         Would really appreciate any help here.
>>
>>         Thanks,
>>         Daman
>>
>>         From: Damanjit Singh <dsingh at adobe.com
>>         <mailto:dsingh at adobe.com> <mailto:dsingh at adobe.com
>>         <mailto:dsingh at adobe.com>>>
>>
>>         Date: Friday, 6 June 2014 12:57 pm
>>         To: "llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>
>>         <mailto:llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>>"
>>         <llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>
>>         <mailto:llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu>>>
>>
>>         Subject: Support for Windows Phone 8.1
>>
>>         Hi LLVMdev,
>>
>>         Does the latest trunk code support Windows Phone 8.1 target ?
>>
>>
>>     I don't know this, but ...
>>
>>         I was trying out a simple program, but Visual Studio 2013’s linker
>>         failed for me with this error - app.obj : error LNK2008: Fixup
>>         target is
>>         not aligned ‘add3'
>>
>>         This is what I tried -
>>
>>         * Download latest LLVM sources (as on 4th June) and build them
>>         on my
>>         MAC 10.9 machine.
>>         * Wrote a simple a.c, with add3 function-
>>
>>
>>         int add3(int i, int j)
>>         {
>>         int k = i+j;
>>         return k;
>>         }
>>
>>         * Create LLVM IR using Xcode 5.1’s clang ( *clang –S -O0
>>         -emit–llvm a.c* )
>>         * Create obj file – using llc - *. /i686-apple-darwin11-llc
>>         -filetype=obj -mtriple=thumbv7-windows-msvc -O0 a.s *
>>
>>
>>     ... in general this doesn't work. The transformation from C to
>>     LLVM IR needs to know the target triple. Try "clang
>>     --target=thumbv7-windows-msvc a.c -c -o a.obj"? Since clang has a
>>     built-in assembler, you should get a valid COFF file out, to the
>>     extent that clang and llvm support this target.
>>
>>     If that doesn't work, I may suggest it's unsupported.
>>
>>
>> As Nick mentioned, please generate the object file directly from
>> clang. You can use armv7-windows or thumbv7-windows (clang will
>> translate armv7-windows to thumbv7-windows implicitly). I just fixed a
>> bug that should allow you to link the object files with link.
>>
>>     Nick
>>
>>         * Now on a Windows 8.1 Desktop machine, link this object file
>>         into
>>
>>         sample (new DirectX app, windows phone) Visual Studio 2013
>>         project.
>>         * Declare and Call add3 in the sample windows project.
>>         * I then get a linker error on building the solution.
>>
>>         *1>app.obj : error LNK2008: Fixup target is not aligned 'add3'*
>>         *1>LINK : fatal error LNK1165: link failed because of fixup
>>         errors*
>>         *========== Rebuild All: 0 succeeded, 1 failed, 0 skipped
>>         ==========*
>>
>>
>>
>>         Could someone please confirm about the state of support for
>>         Windows
>>         Phone 8.1 ? Or am I missing something here?
>>
>>         Thanks,
>>         Daman
>>
>>
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>>
>>
>>
>> --
>> Saleem Abdulrasool
>> compnerd (at) compnerd (dot) org