[Bug driver/81358] libatomic not automatically linked with C11 code

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81358

--- Comment #10 from Andreas Schwab <sch...@linux-m68k.org> ---
All these failure modes can already be observed on riscv-linux, where -pthread
implies -latomic.