[LLVMdev] How to compile a linux module into .bc file using clang or llvm command?
John Criswell
criswell at illinois.edu
Wed Apr 11 18:41:24 PDT 2012
On 4/11/12 8:35 PM, 15102925731 wrote:
> Ok, that makes sense!
>
> That is to say, I don't need a makefile (in which to specify the path
> to kernel) to compile it. Just a clang command with some option will
> do it, right?
Yes, you just need a clang command line. However, using the kernel's
Makefiles to figure out which -I and -D options to use will make things
easier.
-- John T.
>
> --
> 祝好！
> 甄凯
> ------------------------------------------------------------------------------------------------------
> 2012-04-12
> ------------------------------------------------------------------------------------------------------
> Name: 甄凯(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.
>
> At 2012-04-12 09:31:43,"John Criswell" <criswell at illinois.edu> wrote:
>
> On 4/11/12 8:25 PM, 15102925731 wrote:
>> Yeah, but I tried that command and error message was generated:
>>
>> hellomodule.c:1:10: fatal error: 'linux/init.h' file not found
>> #include <linux/init.h>
>> ^
>> 1 error generated.
>>
>> how to solve this problem??
>
> Well, you do have to include all the -I and -D options so that
> clang can find the Linux kernel header files. I don't know off
> hand what those specific options are, but the easiest thing to do
> is to build the kernel, grab the gcc command line that compiles
> your .c file to a .o file, and then replace gcc with clang and add
> the -emit-llvm option to the command line.
>
> -- John T.
>
>>
>> Thanks!
>>
>> --
>> 祝好！
>> 甄凯
>> ------------------------------------------------------------------------------------------------------
>> 2012-04-12
>> ------------------------------------------------------------------------------------------------------
>> Name: 甄凯(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.
>>
>> At 2012-04-11 23:48:07,"John Criswell" <criswell at illinois.edu> wrote:
>>
>> 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!
>>>
>>> --
>>> 祝好！
>>> 甄凯
>>> ------------------------------------------------------------------------------------------------------
>>> 2012-04-11
>>> ------------------------------------------------------------------------------------------------------
>>> Name: 甄凯(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.
>>>
>>> 在 2012-04-11 09:56:21，"Justin Holewinski"
>>> <justin.holewinski at gmail.com> 写道：
>>>
>>>
>>> 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!
>>>
>>>
>>>
>>>
>>> --
>>> 祝好！
>>> 甄凯
>>> ------------------------------------------------------------------------------------------------------
>>> 2012-04-11
>>> ------------------------------------------------------------------------------------------------------
>>> Name: 甄凯(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.
>>>
>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu <mailto:LLVMdev at cs.uiuc.edu>
>>> http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>>
>>>
>>>
>>>
>>> --
>>>
>>> Thanks,
>>>
>>> Justin Holewinski
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> LLVM Developers mailing list
>>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>>
>>
>
>
>
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