llvm dev - Sep 2008 - [LLVMdev] bc file only with llvm-gcc3?

question about:
http://llvm.org/docs/FAQ.html#translatec++
"With llvm-gcc3, this will generate program and program.bc."

Is this llvm-gcc3 only out of date of is it really only llvm-gcc3?

I have 'llvm-g++ (GCC) 4.2.1 (Based on Apple Inc. build 5546) (LLVM
build)' installed on Ubuntu and followed that guide and it creates
indeed no .bc file.

Regards,
-mr

On Wed, Sep 17, 2008 at 1:31 PM, Michael Reichenbach
<michael_reichenbach at freenet.de> wrote:
> question about:
> http://llvm.org/docs/FAQ.html#translatec++
> "With llvm-gcc3, this will generate program and program.bc."
>
> Is this llvm-gcc3 only out of date of is it really only llvm-gcc3?
Those instructions are out of date; the current version of llvm-gcc
doesn't generate bitcode files unless you explicitly ask it to
generate them.  The correct procedure with a current LLVM and llvm-gcc
is something like the following:

llvm-g++ a.cpp -c -emit-llvm
llvm-g++ b.cpp -c -emit-llvm
llvm-link a.bc b.bc -o program.bc
llc -march=c program.bc -o program.c
gcc program.c

-Eli

Eli Friedman schrieb:
> On Wed, Sep 17, 2008 at 1:31 PM, Michael Reichenbach
> <michael_reichenbach at freenet.de> wrote:
>> question about:
>> http://llvm.org/docs/FAQ.html#translatec++
>> "With llvm-gcc3, this will generate program and program.bc."
>>
>> Is this llvm-gcc3 only out of date of is it really only llvm-gcc3?
> 
> Those instructions are out of date; the current version of llvm-gcc
> doesn't generate bitcode files unless you explicitly ask it to
> generate them.  The correct procedure with a current LLVM and llvm-gcc
> is something like the following:
> 
> llvm-g++ a.cpp -c -emit-llvm
> llvm-g++ b.cpp -c -emit-llvm
> llvm-link a.bc b.bc -o program.bc
> llc -march=c program.bc -o program.c
> gcc program.c
> 
> -Eli
Thanks for fast response!
Currently I am trying what you told me.

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?

Regards,
-mr