[LLVMdev] bc file only with llvm-gcc3?

[Samuel Crow]

Hello Michael,

If you're just trying to run the code you can skip the llc and gcc states and go directly to lli.  PowerPC and Intel x86 are the only architectures supported by the jit compiler right now but it should work fine from Windows.  The C output backend needs some work since C isn't a low-level language enough to compile the abstractions of LLVM Assembly code.

--Sam Crow

--- On Wed, 9/17/08, Michael Reichenbach <michael_reichenbach at freenet.de> wrote:

> From: Michael Reichenbach <michael_reichenbach at freenet.de>
> Subject: Re: [LLVMdev] bc file only with llvm-gcc3?
> To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Date: Wednesday, September 17, 2008, 5:39 PM
> Dale Johannesen schrieb:
> > On Sep 17, 2008, at 2:36 PMPDT, Michael Reichenbach
> wrote:
> >> No matter if I try "
> >> llvm-g++ a.cpp -c -emit-llvm
> >> " with "LLVM-GCC 4.2 Front End Binaries
> for Mingw32/x86" on Windows XP
> >> or if I am trying it on Ubuntu...
> >>
> >> Only the a.o file will be created without any
> error messages. The .bc
> >> file will not be created, do you know why?
> > 
> > -emit-llvm doesn't change the default name for the
> -c output.
> > The .o file should be llvm binary IR; if you want it
> named .bc, use -o  
> > a.bc
> > If you're starting out, probably -S -emit-llvm is
> more useful, you can  
> > read that format.
> 
> Ok, I understand so far.
> 
> I have a partially working example now.
> 
> llvm-g++ a.cpp -c -emit-llvm
> llvm-g++ b.cpp -c -emit-llvm
> llvm-link a.o b.o -o program.bc
> llc -march=c program.bc -o program.c
> gcc program.c
> 
> program.c will contain some non-human generated code. But
> it doesn't
> compile with gcc. There is an error, gcc complaints about
> undefined
> reference to std::cout and such (the code was just a very
> small example
> with cout).
> 
> It hasn't be converted into "C only" code,
> can you tell me why?
> 
> Regards,
> -mr
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