[Bug build/33848] New: Build fails at openat2.h, redefinition of 'struct open_how'

[faber at faberman dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=33848

            Bug ID: 33848
           Summary: Build fails at openat2.h, redefinition of 'struct
                    open_how'
           Product: glibc
           Version: 2.43
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: faber at faberman dot de
                CC: carlos at redhat dot com
  Target Milestone: ---

Cross-compiling for arm/armhf with gcc 15.2.1-20260124, the build fails with

```
In file included from ../sysdeps/unix/sysv/linux/openat2.c:20:
../sysdeps/unix/sysv/linux/bits/openat2.h:25:8: error: redefinition of 'struct
open_how'
   25 | struct open_how
      |        ^~~~~~~~
In file included from ../sysdeps/unix/sysv/linux/bits/fcntl-linux.h:473,
                 from ../sysdeps/unix/sysv/linux/arm/bits/fcntl.h:54,
                 from ../io/fcntl.h:35,
                 from ../include/fcntl.h:2,
                 from ../sysdeps/unix/sysv/linux/openat2.c:19:
../sysdeps/unix/sysv/linux/bits/openat2.h:25:8: note: originally defined here
   25 | struct open_how
      |        ^~~~~~~~
```

Looking at the source the struct is not guarded against the redefinition when
being included multiple times.

I helped myself for the moment with

```
diff --git a/sysdeps/unix/sysv/linux/bits/openat2.h
b/sysdeps/unix/sysv/linux/bits/openat2.h
index 454d7699e7..0541138007 100644
--- a/sysdeps/unix/sysv/linux/bits/openat2.h
+++ b/sysdeps/unix/sysv/linux/bits/openat2.h
@@ -28,6 +28,7 @@ struct open_how
   __uint64_t mode;
   __uint64_t resolve;
 };
+# define __glibc_has_open_how
 #endif

 /* how->resolve flags for openat2. */
```

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