On Fri, 19 Mar 2021, Jakub Jelinek via Gcc-patches wrote: > Hi! > > As the following testcases show, compared to -D_Atomic= case we have many > -Wunused-but-set-* warning false positives. > When an _Atomic variable/parameter is read, we call mark_exp_read on it in > convert_lvalue_to_rvalue, but build_atomic_assign does not. > For consistency with the non-_Atomic case where we mark_exp_read the lhs > for lhs op= ... but not for lhs = ..., this patch does that too. > But furthermore we need to pattern match the trees emitted by _Atomic store, > so that _Atomic store itself is not marked as being a variable read, but > when the result of the store is used, we mark it. > > Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK. -- Joseph S. Myers jos...@codesourcery.com
