[LLVMdev] Problem using march=c

[Cristianno Martins]

Hello again,

Thanks for the responses =)

Dmitry, I have two points to comment:
- First, I applied these two patches, and the .cbe.c file came out ok,
except for one little thing -- the global variable was created with
both modifiers: static and extern. Then, I just added a single guard
to prevent this to happen (in a case of a variable having local
linkage, the "extern" part was not printed to file).
- Second, I created the patch appended in this email, but instead of
representing only the "guard-adding" part, this patch is a union of
this change, and the others two patches you sent to me.

Thanks again,

--
Cristianno Martins
PhD Student of Computer Science
University of Campinas
cmartins at ic.unicamp.br



On Mon, Mar 5, 2012 at 6:19 AM, Dmitry N. Mikushin <maemarcus at gmail.com> wrote:
> Hi Cristianno,
>
> This problem has been around for a while, ourselves we solve it with the
> following patches:
>
> https://hpcforge.org/scm/viewvc.php/trunk/patches/llvm.gpu.patch?root=kernelgen&view=markup
>
> https://hpcforge.org/scm/viewvc.php/trunk/patches/llvm.patch?revision=591&root=kernelgen&view=markup
>
> Please feel free to apply them, they *should* work for you even with the
> latest llvm 3.1. Also please feel free to ping me in case of any troubles.
>
> - D.
>
>
>
> ----- Original message -----
>> Hello everyone,
>>
>> I've been trying to generate a C file using the llc tool, but I'm
>> having a problem. I'm using a single Hello World program in C, and
>> executing the following passes:
>>
>> clang -emit-llvm -c -o hello.bc hello.c   # getting the bit code of
>> hello.c llc -march=c hello.bc                          # generating the
>> hello.cbe.c file using the llvm C backend
>>
>> So far, nothing weird happened. The problem occurs once I try to
>> compile the hello.cbe.c: gcc, and even clang, show me some warning and
>> error messages.
>> Cheking in hello.cbe.c, I could see that the problem was related with
>> the structs declarations and initialization. There, they appears to be
>> something like
>>
>>                /* Global Variable Declarations */
>>                static _OC_str { unsigned char array[13]; };
>>
>>                /* Global Variable Definitions and Initialization */
>>                static _OC_str { unsigned char array[13]; } = { "Hello
>> World\n"
>> };
>>
>> when they should be like
>>
>>                /* Global Variable Declarations */
>>                static struct type_OC_str { unsigned char array[13]; };
>>
>>                /* Global Variable Definitions and Initialization */
>>                static struct type_OC_str _OC_str = { "Hello World\n" };
>>
>> It is a known problem, or am I doing something wrong?
>>
>> Thks in advance,
>>
>> --
>> Cristianno Martins
>> PhD Student of Computer Science
>> University of Campinas
>> cmartins at ic.unicamp.br
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu                http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: CBackend.patch
Type: application/octet-stream
Size: 20144 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120305/64ab34a2/attachment.obj>