[Bug 280210] '#include <stdatomic.h>' fails when -std=c99 and -pedantic-errors options are specified (found on the multimedia/librist port)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280210

            Bug ID: 280210
           Summary: '#include <stdatomic.h>' fails when -std=c99 and
                    -pedantic-errors options are specified (found on the
                    multimedia/librist port)
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: yuri@freebsd.org

Created attachment 251956
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=251956&action=edit
test.shar

When the C file with a single include is compiled with 'cc -std=c99
-pedantic-errors test.c' - it fails:



$ sh run.sh
In file included from test.c:1:
/usr/include/stdatomic.h:385:10: error: member reference base type '_Bool' is
not a structure or union
  385 |         return (atomic_exchange_explicit(&__object->__flag, 1,
__order));
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/stdatomic.h:303:39: note: expanded from macro
'atomic_exchange_explicit'
  303 |         ((void)(order), __sync_swap(&(object)->__val, desired))
      |                                      ~~~~~~~~^ ~~~~~
/usr/include/stdatomic.h:392:2: error: member reference base type '_Bool' is
not a structure or union
  392 |         atomic_store_explicit(&__object->__flag, 0, __order);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/stdatomic.h:334:9: note: expanded from macro
'atomic_store_explicit'
  334 |         ((void)atomic_exchange_explicit(object, desired, order))
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/stdatomic.h:303:39: note: expanded from macro
'atomic_exchange_explicit'
  303 |         ((void)(order), __sync_swap(&(object)->__val, desired))
      |                                      ~~~~~~~~^ ~~~~~
2 errors generated.

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