[LLVMdev] link native code compiled by llvm and gcc?

[Jovi Zhang]

On Sat, May 4, 2013 at 1:54 AM, Karen Shaeffer <shaeffer at neuralscape.com> wrote:
> On Fri, May 03, 2013 at 11:11:30PM +0800, Jovi Zhang wrote:
>> Hi,
>>
>> Is it possible to link native codes generated by different compiler?
>>
>> the usecase could be:
>> Linux kernel compiled by gcc want to load kernel module compiled by Clang
>> (I know there have some problem to compile kernel by Clang currently,
>> but ignore those problem in here)
>>
>> I just concern about the call conversion problem, and compatibility
>> between gcc and clang.
>
> Hi Jovi,
> It can be complicated. Many distributions patch gcc, the kernel, and the
> entire tool chain. A good example is RedHat, which applies many many patches
> to the kernel and the tool chain, including gcc. I believe embedded releases
> are similar. The canonical kernel releases are only tested on specific canonical
> versions of gcc. While I am certain you can realize this goal, you might run into
> some subtle problems. I would start by auditing the tool chains and kernels you are
> using, to understand any changes they have made downstream from the canonical kernel
> and gcc releases. In the case of RedHat, I believe they require you to build the
> kernel with their tool chain. They will not support any modifications to the build
> process or the kernel. So, in a situation such as you describe, you are likely on
> your own.
>
Thanks Karen, your info is helpful for me.
I will check the tool chain firstly.