llvm dev - Jul 2015 - [LLVMdev] How to add a new target/toolchain to Clang ?

Thanks Tom for your help, it as indeed very easy to make the link with the
linker (not sick joke).
Unfortunately, clang generates object files for target x86_64, even though
I try --target --triple, --arch, ...
What is the trick to tell him which target to use ?

--
Fred
ps: not looked yet at inline assembly


2015-07-09 18:40 GMT+02:00 Tom Stellard <tom at stellard.net>:
> On Thu, Jul 09, 2015 at 03:57:53PM +0200, Frédéric Heitzmann wrote:
> > Hi all,
> >
> > I have been developping a out-of-tree backend.
> > I would like to integrate it with clang.
> > Note that my backend is rather simple, generates elf32, and I do not
need
> > about linux, libary paths, ...
> >
> > Can someone give me a pointer to a readme, an article, or maybe a good
> > (i.e. simple) example ?
> >
> > Note :on a second step, I would like to support inline assembly in C
> code..
> >
>
> Here is a simple example for adding a new toolchain:
> http://reviews.llvm.org/D10700
>
> See R600TargetInfo in lib/Basic/Targets.cpp for an example of a
> simple Target that supports inline assembly.
>
> -Tom
>
> > --
> > Frederic Heitzmann
>
> > _______________________________________________
> > 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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On Fri, Jul 10, 2015 at 04:16:33PM +0200, Frédéric Heitzmann
wrote:
> Thanks Tom for your help, it as indeed very easy to make the link with the
> linker (not sick joke).
> Unfortunately, clang generates object files for target x86_64, even though
> I try --target --triple, --arch, ...
> What is the trick to tell him which target to use ?
> 
The option to use is -target:

clang -target yourcpu-- in.c

You also need to teach clang to map the triple to your
TargetInfo implementation. See AllocateTarget()  in lib/Basic/Targets.cpp

-Tom
> --
> Fred
> ps: not looked yet at inline assembly
> 
> 
> 2015-07-09 18:40 GMT+02:00 Tom Stellard <tom at stellard.net>:
> 
> > On Thu, Jul 09, 2015 at 03:57:53PM +0200, Frédéric Heitzmann wrote:
> > > Hi all,
> > >
> > > I have been developping a out-of-tree backend.
> > > I would like to integrate it with clang.
> > > Note that my backend is rather simple, generates elf32, and I do
not need
> > > about linux, libary paths, ...
> > >
> > > Can someone give me a pointer to a readme, an article, or maybe a
good
> > > (i.e. simple) example ?
> > >
> > > Note :on a second step, I would like to support inline assembly
in C
> > code..
> > >
> >
> > Here is a simple example for adding a new toolchain:
> > http://reviews.llvm.org/D10700
> >
> > See R600TargetInfo in lib/Basic/Targets.cpp for an example of a
> > simple Target that supports inline assembly.
> >
> > -Tom
> >
> > > --
> > > Frederic Heitzmann
> >
> > > _______________________________________________
> > > LLVM Developers mailing list
> > > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
> >

2015-07-10 16:37 GMT+02:00 Tom Stellard <tom at stellard.net>:
>
> You also need to teach clang to map the triple to your
> TargetInfo implementation. See AllocateTarget()  in lib/Basic/Targets.cpp
>
Good catch.
clang is now generating asm files for my target.
Although llc works, llvm-mc is not finished yet, so it breaks.

Is there a reason clang generates asm then object files, instead of going
internaly to MCInst then object file ?
And can I force it to do so ?
I did not find the appropriate option or hook in class ToolChain ...

--
Fred
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