On Tue, Sep 14, 2010 at 11:47 AM, Uday P. Khedker <u...@cse.iitb.ac.in> wrote: > Attached please find two dumps t.c.032t.mergephi1 and t.c.033t.cddce1. > The assignment is present in the former while it disappears in the > latter. The latter dump is the output of the dead code elimination > pass pass_cd_dce. So this is indeed an instance of dead code elimination. > > But may be you are right, what facilitate dead code elimination > be based on modification of read-only data. However, if that is > the case, I wonder what is the reason why change happens when s is > an array...
What is being done is correct really. Since the string has the type of const char[]. Since you have an explicit cast to get rid of the const qualifer, we don't warn. I don't see a bug here at all really. You are invoking an undefined behavior, GCC keep the assignment around or get rid of it. -- Pinski
