[LLVMdev] cross-compiling with llvm
Robert L. Bocchino Jr.
bocchino at uiuc.edu
Tue Mar 7 10:58:32 PST 2006
> 1. Is it possible at all to cross-compile with llvm?
Yes, this is possible. I've cross-compiled from x86 to MIPS using
LLVM. However, the codes I compiled using this technique did not
always run correctly. You may have better luck with PPC.
> 2. I allready have a gcc cross-compiler for power-pc, do i need
> this or
> does llvm contain its own? How can i tell llvm to use it?
LLVM has no MIPS backend, so when I did this, I used the C backend to
transform the LLVM bytecode to C, then put the result through a gcc
MIPS cross compiler. LLVM does have a PPC backend, however, so I
don't think you need to do this. I think you want to build llvm-gcc
on x86 as a PPC cross compiler, use it to compile to LLVM bytecode,
and then use the PPC backend to generate PPC code. To generate PPC
code from foo.bc, you say llc -march=powerpc < foo.c > foo.
> 3. Is there any howto for doing the cross-compiling? I think i need
> to compile the gcc-front-end for this task, but i don't know the
> options for the configuration script.
Building llvm-gcc as a cross compiler is tricky and not documented.
I'm away from Urbana right now, but when I get back tomorrow I'll
take a look at what I did for MIPS and see if I can reconstruct it
for you.
Rob
Robert L. Bocchino Jr.
Ph.D. Student
University of Illinois, Urbana-Champaign
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20060307/bb468d9a/attachment.html>
More information about the llvm-dev
mailing list