Hello! > This is not a regression but I thought I'd post this anyway. Martin reported > that we generate -Wunused-value warnings on the attached testcase, which > arguable doesn't make sense. Setting TREE_USED suppresses the warning. Since > we already compute 'fetch_op' I used that. (This warning doesn't trigger e.g. > for __atomic_load/store/compare.) > > Bootstrapped/regtested on x86_64-linux, ok for trunk or gcc7? > > 2016-03-04 Marek Polacek <pola...@redhat.com> > > PR c/69407 > * c-common.c (resolve_overloaded_builtin): Set TREE_USED for the fetch > operations. > > * gcc.dg/atomic-op-6.c: New test.
You can probably revert my workaround [1] that suppressed these warnings in libsupc++/guard.cc. [1] https://gcc.gnu.org/ml/gcc-patches/2015-07/msg00023.html Uros.
