[LLVMdev] How to enable cbe as a supported target?

[Mingliang LIU]

Hi all, 

I met an error when I run the llc command to transform a bitcode file to C code (source to source):

$ llc -march=c -o foo.c foo.ll

However, it said "llc: error: invalid target 'c'." I checked the 'llc --version' only to find that there is no c as target. The cpp was there, which makes calls against the LLVM C++ API. But that's not what I want. 

I configured my LLVM with default options, thus I supposed the 'cbe' should have been enabled as a supported target. Nevertheless, I tried to enable it explicitly:

$ ../configure --enable-targets=cbe

It occurred the error: "configure: error: Unrecognized target cbe"

Any clue?

Thank you.

--
Mingliang LIU (刘明亮 in Chinese)

PACMAN Group,  Dept. of Computer Science & Technology
Tsinghua University, Beijing 100084, China
Email: liu...@mails.tsinghua.edu.cn

Homepage: http://pacman.cs.tsinghua.edu.cn/~liuml07/

[Arnold Schwaighofer]

The C Backend was remove in 3.1
(http://llvm.org/releases/3.1/docs/ReleaseNotes.html):

"Major Changes and Removed Features
...
The C backend has been removed. It had numerous problems, to the point
of not being able to compile any nontrivial program."

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[Mingliang LIU]

Hi Arnold,

Thank you. I googled but missed the release notes.

Regards.

[陳韋任 (Wei-Ren Chen)]

On Thu, Dec 06, 2012 at 10:05:03AM +0800, Mingliang LIU wrote:
> Hi Arnold,
>
> Thank you. I googled but missed the release notes.
>
> Regards.

Someone else out there tried to bring cbe back. You can search the ML
archieve and reach them out.

Regards,
chenwj

--
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

[Roel Jordans]

Hi Arnold,

On 06/12/12 08:50, 陳韋任 (Wei-Ren Chen) wrote:
> On Thu, Dec 06, 2012 at 10:05:03AM +0800, Mingliang LIU wrote:
>> Hi Arnold,
>>
>> Thank you. I googled but missed the release notes.
>>
>> Regards.
>
> Someone else out there tried to bring cbe back. You can search the ML
> archieve and reach them out.
>

That would be me.

> Regards,
> chenwj
>

I have posted some of my initial ideas on the list in August [1] and a
set of patches against the trunk (at that time) in November [2].

I haven't had much time to spend on developing my patches further but I
am planning to do so as soon as I get more time (which should be early
next year)

Regards,
Roel

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-August/052858.html
[2] http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-November/056089.html

[Mingliang LIU]

Hi Roel,

Glad to know. I'll give it a try later.

Thank you.