[LLVMdev] running llvmgcc without optimization?

[Juan Nicolas Ruiz]

How can I run llvm-gcc in such a way that does not perform
optimizations like constant propagation and dead code elimination?

In particular, I'm trying to analyze cases where the code will look
like:

  int *op;
  int *ip=(int*)malloc(sizeof(int));
  op=ip;
  /* store/read into *ip */
  free(op);

but llvm-gcc transforms the above code to

  int *ip=(int*)malloc(sizeof(int));
  /* store/read into *ip */
  free(ip);

which is a very reasonable thing to do, except that I _need_ to test
cases where I allocate objects with one pointer and deallocate with
another.

nicolas