[LLVMdev] generating a shared object from a single *.ll (LLVM) source?

[Basile STARYNKEVITCH]

Hello all,

In a previous email, I asked:

Basile STARYNKEVITCH wrote:
> 
> (my machine is a Debian/Sid/x86-64/Core2)
> 
> Assuming I have one C source file chello.c, to compile it into a 
> dynamically loadable thru dlopen shared object, I can run
>     gcc -fPIC -shared -O chello.c -o chello.so
> I thought that, assuming I have one llvm source ehello.ll, the 
> equivalent would be
>     llvmc2 -opt ehello.ll -o ehello.so
> but it is not that simple.

Apparently the following script should work; $1 is supposed to be a 
source file -either *.c or *.cc or *.ll and $2 is the generated output 
dynamically loadable shared object *.so

   #! /bin/sh
   src=$1
   obj=$2
   objbase=$(basename $obj .so)
   case $src in
     *.c) gcc -O -g -fPIC -shared $src -o $obj;;
     *.cc) g++ -O -g -fPIC -shared $src -o $obj;;
     *.ll)  /usr/local/bin/llvm-as -f $src -o $objbase.bc
        /usr/local/bin/opt  -std-compile-opts -f $objbase.bc -o 
$objbase.opt.bc
        /usr/local/bin/llc -f -relocation-model=pic -march=x86-64 
-tailcallopt $objbase.opt.bc > $objbase.s
        as $objbase.s -o $objbase.pic.o
        ld -shared  $objbase.pic.o -o $obj
        rm $objbase.s $objbase.pic.o $objbase.opt.bc $objbase.bc;;
     *) echo unknown file $src; exit 1;;
   esac

Thanks for reading.

Regards.
-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
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