thr3ads.net - llvm dev - [LLVMdev] Support for Windows Phone 8.1 [Jun 2014]

If this information is useful, please help other people find it:
Share via:

Damanjit Singh

2014-Jun-18 16:09 UTC

[LLVMdev] Support for Windows Phone 8.1

Hi Saleem,

Though a simple app works great I am facing few issues trying to link a slightly
complex object file, generated via LLVM, with some libs generated via Visual
Studio -
1. Seems IMAGE_SCN_MEM_16BIT is only written for the the first header in the
COFF file, thus functions in other headers (if you are using function sections)
don’t work. I was able to workaround this by forcing this entry for each header
by making some (hacky) changes in LLVM sources. I am not much familiar with the
LLVM source code, thus would better let the experts to do a correct fix for this
issue.
2. There is something strange happening with b.w instruction in the final linked
executable. I see that in the disassembly for object code (generated via LLVM
with thumbv7-windows-msvc triple), the b.w instruction correctly points to the
label I want. But after linking, it now points to some random address. Seems
like there are some fixup issues related to b.w instruction. Note that I am
using Visual Studio’s linker to create a Window’s phone app.

I would really appreciate any help, or pointers for further investigation, for
the second issue above.

Thanks,
Daman

On 09/06/14 8:45 pm, "Saleem Abdulrasool" <abdulras at
fb.com<mailto:abdulras at fb.com>> wrote:


On Jun 8, 2014, at 10:46 PM, Damanjit Singh <dsingh at
adobe.com<mailto:dsingh at adobe.com>> wrote:

Thanks a lot Saleem,
The issue is fixed and a simple app works fine now.

Awesome; thanks for the verification.

-Daman
On 08/06/14 12:57 pm, "Nick Lewycky" <nicholas at
mxc.ca<mailto:nicholas at mxc.ca>> wrote:
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>
<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>
<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>>>         <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%20%3Cmailto: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%20%3Cmailto: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 2013¹s
linker
        failed for me with this error - app.obj : error LNK2008: Fixup
        target is
        not aligned Œadd3'
        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 5.1¹s clang ( *clang S -O0
        -emitllvm 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
        ______________________________ _________________
        LLVM Developers mailing list
        LLVMdev at cs.uiuc.edu<mailto:LLVMdev at cs.uiuc.edu>
<mailto:LLVMdev at cs.uiuc.edu>
       
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
       
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
mailman/listinfo/llvmdev
       
<https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f>
    ______________________________ _________________
    LLVM Developers mailing list
    LLVMdev at cs.uiuc.edu<mailto:LLVMdev at cs.uiuc.edu>
<mailto:LLVMdev at cs.uiuc.edu>
   
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
   
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
mailman/listinfo/llvmdev
   
<https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f>
--
Saleem Abdulrasool
compnerd (at) compnerd (dot) org
_______________________________________________
LLVM Developers mailing list
LLVMdev at cs.uiuc.edu<mailto:LLVMdev at cs.uiuc.edu>        
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f

--
Saleem Abdulrasool
abdulras (at) fb (dot) com






-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20140618/02919116/attachment.html>

Saleem Abdulrasool

2014-Jun-18 17:25 UTC

head link

[LLVMdev] Support for Windows Phone 8.1

On Wed, Jun 18, 2014 at 9:09 AM, Damanjit Singh <dsingh at adobe.com>
wrote:
>  Hi Saleem,
>
>  Though a simple app works great I am facing few issues trying to link a
> slightly complex object file, generated via LLVM, with some libs generated
> via Visual Studio -
> 1. Seems IMAGE_SCN_MEM_16BIT is only written for the the first header in
> the COFF file, thus functions in other headers (if you are using function
> sections) don’t work. I was able to workaround this by forcing this entry
> for each header by making some (hacky) changes in LLVM sources. I am not
> much familiar with the LLVM source code, thus would better let the experts
> to do a correct fix for this issue.
>
Sounds like non-default text sections aren't being emitted correctly.  This
would be problematic, particularly in the future if we are to maintain
compatibility with the Microsoft toolchain.  They are switching to grouped
sections by default for aiding optimizations.  I will look into this.

> 2. There is something strange happening with *b.w* instruction in the
> final linked executable. I see that in the disassembly for object code
> (generated via LLVM with thumbv7-windows-msvc triple), the b.w instruction
> correctly points to the label I want. But after linking, it now points to
> some random address. Seems like there are some fixup issues related to
> *b.w* instruction. Note that I am using Visual Studio’s linker to create
> a Window’s phone app.
>
This is interesting.  It sounds like this should be an
IMAGE_REL_ARM_BRANCH20T relocation.  I've never really seen any issues with
this particular relocation.  I would need some code that generates the
issue that you are seeing so that I can investigate the cause of the bad
linking (or at least something with which to reproduce the issue).

It may be informative to determine what the difference is between the
emitted location and what it should be.

> I would really appreciate any help, or pointers for further investigation,
> for the second issue above.
>
>  Thanks,
> Daman
>
>  On 09/06/14 8:45 pm, "Saleem Abdulrasool" <abdulras at
fb.com> wrote:
>
>
>  On Jun 8, 2014, at 10:46 PM, Damanjit Singh <dsingh at adobe.com>
wrote:
>
>  Thanks a lot Saleem,
>  The issue is fixed and a simple app works fine now.
>
>
>  Awesome; thanks for the verification.
>
>  -Daman
>  On 08/06/14 12:57 pm, "Nick Lewycky" <nicholas at mxc.ca>
wrote:
>
> 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> <compnerd at
compnerd.org%3E>> wrote:
>
> On Sat, Jun 7, 2014 at 4:49 PM, Nick Lewycky <nicholas at mxc.ca
> <mailto:nicholas at mxc.ca> <nicholas at mxc.ca%3E>> 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 <dsingh at adobe.com>> <
> mailto:dsingh at adobe.com>> <dsingh at adobe.com%3E%3E>>   
<
> mailto:dsingh at adobe.com>> <dsingh at adobe.com%3E%3E>>
>          Date: Friday, 6 June 2014 12:57 pm
>         To: "llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu
> <llvmdev at cs.uiuc.edu>>
>         <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu>>
> <llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu%3E%3E>"
>         <llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu
> <llvmdev at cs.uiuc.edu>>
>         <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu>>
> <llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at cs.uiuc.edu%3E%3E>>
>          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 2013¹s
> linker
>         failed for me with this error - app.obj : error LNK2008: Fixup
>         target is
>         not aligned Œadd3'
>          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 5.1¹s clang ( *clang S -O0
>         -emitllvm 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
>          ______________________________ _________________
>         LLVM Developers mailing list
>         LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu
> <LLVMdev at cs.uiuc.edu>>
>
>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
> mailman/listinfo/llvmdev
>         <
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
> >
>      ______________________________ _________________
>     LLVM Developers mailing list
>     LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu <LLVMdev at
cs.uiuc.edu>>
>
>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
> mailman/listinfo/llvmdev
>     <
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
> >
>   --
> Saleem Abdulrasool
> compnerd (at) compnerd (dot) org
>
>    _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu
>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>
>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
>
>
>  --
> Saleem Abdulrasool
> abdulras (at) fb (dot) com
>
>
>
>
>
>
>

-- 
Saleem Abdulrasool
compnerd (at) compnerd (dot) org
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20140618/5fe2495d/attachment.html>

Saleem Abdulrasool

2014-Jun-23 01:19 UTC

head link

[LLVMdev] Support for Windows Phone 8.1

On Wed, Jun 18, 2014 at 10:25 AM, Saleem Abdulrasool <compnerd at
compnerd.org>
wrote:
> On Wed, Jun 18, 2014 at 9:09 AM, Damanjit Singh <dsingh at adobe.com>
wrote:
>
>>  Hi Saleem,
>>
>>  Though a simple app works great I am facing few issues trying to link
a
>> slightly complex object file, generated via LLVM, with some libs
generated
>> via Visual Studio -
>> 1. Seems IMAGE_SCN_MEM_16BIT is only written for the the first header
in
>> the COFF file, thus functions in other headers (if you are using
function
>> sections) don’t work. I was able to workaround this by forcing this
entry
>> for each header by making some (hacky) changes in LLVM sources. I am
not
>> much familiar with the LLVM source code, thus would better let the
experts
>> to do a correct fix for this issue.
>>
>
> Sounds like non-default text sections aren't being emitted correctly.
>  This would be problematic, particularly in the future if we are to
> maintain compatibility with the Microsoft toolchain.  They are switching to
> grouped sections by default for aiding optimizations.  I will look into
> this.
>
-ffunction-sections should be addressed with SVN r211481.  Thanks for
letting us know about this issue.

> 2. There is something strange happening with *b.w* instruction in the
>> final linked executable. I see that in the disassembly for object code
>> (generated via LLVM with thumbv7-windows-msvc triple), the b.w
instruction
>> correctly points to the label I want. But after linking, it now points
to
>> some random address. Seems like there are some fixup issues related to
>> *b.w* instruction. Note that I am using Visual Studio’s linker to
create
>> a Window’s phone app.
>>
>
> This is interesting.  It sounds like this should be an
> IMAGE_REL_ARM_BRANCH20T relocation.  I've never really seen any issues
with
> this particular relocation.  I would need some code that generates the
> issue that you are seeing so that I can investigate the cause of the bad
> linking (or at least something with which to reproduce the issue).
>
> It may be informative to determine what the difference is between the
> emitted location and what it should be.
>
I am still waiting for some information on how to reproduce this.

>  I would really appreciate any help, or pointers for further
>> investigation, for the second issue above.
>>
>>  Thanks,
>> Daman
>>
>>  On 09/06/14 8:45 pm, "Saleem Abdulrasool" <abdulras at
fb.com> wrote:
>>
>>
>>  On Jun 8, 2014, at 10:46 PM, Damanjit Singh <dsingh at
adobe.com> wrote:
>>
>>  Thanks a lot Saleem,
>>  The issue is fixed and a simple app works fine now.
>>
>>
>>  Awesome; thanks for the verification.
>>
>>  -Daman
>>  On 08/06/14 12:57 pm, "Nick Lewycky" <nicholas at
mxc.ca> wrote:
>>
>> 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> <compnerd at
compnerd.org%3E>> wrote:
>>
>> On Sat, Jun 7, 2014 at 4:49 PM, Nick Lewycky <nicholas at mxc.ca
>> <mailto:nicholas at mxc.ca> <nicholas at mxc.ca%3E>>
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 <dsingh at adobe.com>>
<
>> mailto:dsingh at adobe.com>> <dsingh at
adobe.com%3E%3E>>         <
>> mailto:dsingh at adobe.com>> <dsingh at
adobe.com%3E%3E>>
>>          Date: Friday, 6 June 2014 12:57 pm
>>         To: "llvmdev at cs.uiuc.edu <mailto:llvmdev at
cs.uiuc.edu
>> <llvmdev at cs.uiuc.edu>>
>>         <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu>>
>> <llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu%3E%3E>"
>>         <llvmdev at cs.uiuc.edu <mailto:llvmdev at cs.uiuc.edu
>> <llvmdev at cs.uiuc.edu>>
>>         <mailto:llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu>>
>> <llvmdev at cs.uiuc.edu%20%3Cmailto:llvmdev at
cs.uiuc.edu%3E%3E>>
>>          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 2013¹s
>> linker
>>         failed for me with this error - app.obj : error LNK2008: Fixup
>>         target is
>>         not aligned Œadd3'
>>          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 5.1¹s clang ( *clang S -O0
>>         -emitllvm 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
>>          ______________________________ _________________
>>         LLVM Developers mailing list
>>         LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu
>> <LLVMdev at cs.uiuc.edu>>
>>
>>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>>
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
>> mailman/listinfo/llvmdev
>>         <
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
>> >
>>      ______________________________ _________________
>>     LLVM Developers mailing list
>>     LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu
<LLVMdev at cs.uiuc.edu>
>> >
>>
>>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>>
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=c2b3af446125b243021edc6166e06545c6537664f0739fcd73f556617e6a12a8
>> mailman/listinfo/llvmdev
>>     <
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
>> >
>>   --
>> Saleem Abdulrasool
>> compnerd (at) compnerd (dot) org
>>
>>    _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu
>>
https://urldefense.proofpoint.com/v1/url?u=http://llvm.cs.uiuc.edu/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=3b8b44359c57ff853178c7ac52020429ecdd7082f0022b9df52ceccce0c2c037
>>
>>
https://urldefense.proofpoint.com/v1/url?u=http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=CchYc4lrV44%2BZqxZADw0BQ%3D%3D%0A&m=0Qe%2Bx9MyG7ElZcfL7G1YH5wesJKdCF6vcfoxdGGlllA%3D%0A&s=ccdee7a002753f1de3fb195d0b136caf547181d34ca78c2062b54f3c11c91b5f
>>
>>
>>  --
>> Saleem Abdulrasool
>> abdulras (at) fb (dot) com
>>
>>
>>
>>
>>
>>
>>
>
>
> --
> Saleem Abdulrasool
> compnerd (at) compnerd (dot) org
>


-- 
Saleem Abdulrasool
compnerd (at) compnerd (dot) org
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20140622/bad5295a/attachment.html>

Seemingly Similar Threads

Search for more possibly parallel threads

llvm dev - Jun 2014 - [LLVMdev] Support for Windows Phone 8.1

[LLVMdev] Support for Windows Phone 8.1

[LLVMdev] Support for Windows Phone 8.1

[LLVMdev] Support for Windows Phone 8.1

Seemingly Similar Threads