[LLVMdev] How to compile a linux module into .bc file using clang or llvm command?

[John Criswell]

On 4/10/12 10:11 PM, 15102925731 wrote:
> It's actually is .c file.
> I just want firstly to compile helloworldmodule.c into 
> helloworldmodule.bc.
> Then I run a LLVM pass on it to do some optimization, and then I 
> compile the modified .bc file into .ko file.
>
>  So, could you tell me how to compile helloworldmodule.c into 
> helloworldmodule.bc? I think it's not the same command *"clang -O3 
> -emit-llvm hello.c -c -o hello.bc". *Because it is a device driver 
> that will be at last compiled to be .ko file.

No, that's exactly how you would do it, although you might need to use 
GCC + Dragonegg instead of clang because the Linux 3.0 kernel doesn't 
compile with Clang out-of-the-box (at least for me, anyway).

-- John T.

>
> Thank you!
>
> --
>           ??!
>   ??
> ------------------------------------------------------------------------------------------------------
> 2012-04-11
> ------------------------------------------------------------------------------------------------------
> Name: ??(ZhenKai)
> Homepage:http://www.renren.com/262729393
> Email: zhenkaixd at 126.com <mailto:zhenkaixd at 126.com>or 846227103 at qq.com 
> <mailto:846227103 at qq.com>
> TEL: 15810729006(Beijing)
> Address: Room I-406, Central Building, Tsinghua University, Beijing, 
> China. 100084.
>
> ? 2012-04-11 09:56:21,"Justin Holewinski" 
> <justin.holewinski at gmail.com> ??:
>
>
>     2012/4/10 15102925731 <zhenkaixd at 126.com <mailto:zhenkaixd at 126.com>>
>
>          Hi, my friends
>
>
>         I know there is a difference between compiling a linux module
>         and a simple helloworld programme.
>         If I compile a helloworld.c file, the command is
>         *"clang -O3 -emit-llvm hello.c -c -o hello.bc"*
>         But what the command should be if I want to compile a linux
>         module into a .bc file? (I know it may be an easy question to
>         you guys, but I really don't know where to find the answer on
>         llvm.org <http://llvm.org>.)
>
>
>     What do you mean by linux module?  A shared library (.so)? A
>     kernel module (.ko)?
>
>
>         Thank you!
>
>
>
>
>         --
>                   ??!
>           ??
>         ------------------------------------------------------------------------------------------------------
>         2012-04-11
>         ------------------------------------------------------------------------------------------------------
>         Name: ??(ZhenKai)
>         Homepage:http://www.renren.com/262729393
>         Email: zhenkaixd at 126.com <mailto:zhenkaixd at 126.com>or
>         846227103 at qq.com <mailto:846227103 at qq.com>
>         TEL: 15810729006(Beijing)
>         Address: Room I-406, Central Building, Tsinghua University,
>         Beijing, China. 100084.
>
>
>
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>
>
>
>
>     -- 
>
>     Thanks,
>
>     Justin Holewinski
>
>
>
>
>
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