#error "isc/stdatomic.h does not support your compiler"

Summary

When compiling a plugin outside the bind source tree a fatal error is thrown by #error "isc/stdatomic.h does not support your compiler"

BIND version affected

all 9.18.x versions

Steps to reproduce

1. copy a plugin to outside the bind tree
2. make sure the plugin includes isc/log.h which triggers the inclusion of isc/stdatomic.h
3. use gcc 5.0 or higher

What is the current bug behavior?

The copiler issues a fatal error:

In file included from /local/src/bind/urlfilterdb-isc-bind-918/lib/isc/include/isc/atomic.h:19,
                 from /local/src/bind/urlfilterdb-isc-bind-918/lib/isc/include/isc/types.h:16,
                 from /local/src/bind/urlfilterdb-isc-bind-918/lib/isc/include/isc/log.h:25,
                 from ufdb-bind-log.h:12,
                 from ufdb-bind-log.c:19:
/local/src/bind/urlfilterdb-isc-bind-918/lib/isc/include/isc/stdatomic.h:29:2: error: #error "isc/stdatomic.h does not support your compiler"
   29 | #error "isc/stdatomic.h does not support your compiler"
      |  ^~~~~

What is the expected correct behavior?

compilation is successful

Relevant configuration files

Relevant logs