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

[joseph at codesourcery dot com]

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

--- Comment #4 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
In the libm case, POSIX has an explicit list of headers whose functions 
may require particular libraries to be linked in.  libatomic is required 
for use of language features without any reference to functions from any 
header.