[Bug libc/32119] New: struct stat has different size depending on _POSIX_C_SOURCE

["benjamin.grossschartner at urbanandmainlines dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=32119

            Bug ID: 32119
           Summary: struct stat has different size depending on
                    _POSIX_C_SOURCE
           Product: glibc
           Version: 2.39
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: benjamin.grossschartner at urbanandmainlines dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

On 32bit architectures with 64bit time enabled, struct stat misses the
"__glibc_reserved" fields, if a POSIX version < 2008 is used.

As these reserved fields are also part of the struct used by the linux kernel,
it seems that this is a bug in the glibc headers.

The bug was introduced by:
4e8521333bea6e89fcef1020e59a5f799241c5d4

The last "#endif" in the file
"sysdeps/unix/sysv/linux/bits/struct_stat_time64_helper.h" was missplaced.
In all other definitions of "struct stat" this "#ifdef __USE_XOPEN2K8" only
controls the handling of the time structs, but not these reserved fields.


Suggested fix:

diff --git a/sysdeps/unix/sysv/linux/bits/struct_stat_time64_helper.h
b/sysdeps/unix/sysv/linux/bits/struct_stat_time64_helper.h
index 9ded57aa..124d0b59 100644                                                 
--- a/sysdeps/unix/sysv/linux/bits/struct_stat_time64_helper.h                  
+++ b/sysdeps/unix/sysv/linux/bits/struct_stat_time64_helper.h                  
@@ -58,9 +58,8 @@                                                               
   __fieldts64 (st_atime);                                                      
   __fieldts64 (st_mtime);                                                      
   __fieldts64 (st_ctime);                                                      
+# undef __fieldts64                                                            
+#endif                                                                         

   unsigned long int __glibc_reserved4;                                         
   unsigned long int __glibc_reserved5;                                         
-                                                                               
-# undef __fieldts64                                                            
-#endif

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