/usr/lib/pkgconfig/atomic_ops.pc is in libatomic-ops-dev 7.4-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: The atomic_ops library
Description: Atomic memory update operations portable implementation
Version: 7.4.0
Libs: -L${libdir} -latomic_ops
Cflags: -I${includedir}
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