llvm dev - May 2008 - [LLVMdev] notes on llvmc2

Being fully aware that llvmc2 is work-in-progress, here are some notes
nethertheless:


I already compiled llvm, but llvm-gcc was still compiling. Now I tried the new
llvmc2:

$ llvmc2 -opt -v main.c
llvm-g++ -c -x c main.c -o /tmp/llvm_KeApik/main.bc -emit-llvm
llvmc2: Can't find program 'llvm-g++'


* after this, the directory /tmp/llvm_KeApik was not removed
* why using /tmp at all?  And if, why /tmp/llvm_* and not
  /tmp/llvmc2_* ?
* why calling "llvm-g++ -x c" and not "llvm-gcc" ?
* a --dry-run switch would be nice



Now, llvm-gcc was was finally compiled and installed, so I retried:

$ rm -rf /tmp/llvm_*

$ llvmc2 -opt -v main.c
llvm-g++ -c -x c main.c -o /tmp/llvm_084K2D/main.bc -emit-llvm
opt /tmp/llvm_084K2D/main.bc -o /tmp/llvm_084K2D/main.bc-LXq9ea
opt: error opening '/tmp/llvm_084K2D/main.bc-LXq9ea': file exists!
Use -f command line argument to force output



All of this is based on LLVM SVN 51761.
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Hi Holger,

first of all, thanks for your feedback.
> I already compiled llvm, but llvm-gcc was still compiling. Now I tried the
new
llvmc2:
> 
> $ llvmc2 -opt -v main.c
> llvm-g++ -c -x c main.c -o /tmp/llvm_KeApik/main.bc -emit-llvm
> llvmc2: Can't find program 'llvm-g++'
> 
> 
> * after this, the directory /tmp/llvm_KeApik was not removed
Strange, I couldn't reproduce this. What system are you using? 
> * why calling "llvm-g++ -x c" and not "llvm-gcc" ?
> ...
> $ llvmc2 -opt -v main.c
> llvm-g++ -c -x c main.c -o /tmp/llvm_084K2D/main.bc -emit-llvm
> opt /tmp/llvm_084K2D/main.bc -o /tmp/llvm_084K2D/main.bc-LXq9ea
> opt: error opening '/tmp/llvm_084K2D/main.bc-LXq9ea': file exists!
> Use -f command line argument to force output
Thanks for reporting these issues, I've fixed them in SVN.
> $ rm -rf /tmp/llvm_*
BTW, you didn't have to do this, llvmc always creates a unique temporary
directory for each invocation.

> > I already compiled llvm, but llvm-gcc was still compiling.
> > Now I tried the new
>
> llvmc2:
> > $ llvmc2 -opt -v main.c
> > llvm-g++ -c -x c main.c -o /tmp/llvm_KeApik/main.bc
> > -emit-llvm llvmc2: Can't find program 'llvm-g++'
> >
> >
> > * after this, the directory /tmp/llvm_KeApik was not removed
>
> Strange, I couldn't reproduce this. What system are you using?
Linux in the "Debian Etch" flavour.


I've now switched to SVN 51864. I tried to re-create the problem 
with "rm dist/bin/llvm-gcc", but now it worked as expected: the 
temp directory was removed.