[Bug libc/32024] New: sys/un.h includes header files within extern "C++" { ... }

["bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=32024

            Bug ID: 32024
           Summary: sys/un.h includes header files within extern "C++" {
                    ... }
           Product: glibc
           Version: 2.40
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: bruno at clisp dot org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The <sys/un.h> header file includes other header files (<stddef.h> and
<string.h>) from within an extern "C++" { ... } block (written as __BEGIN_DECLS
and __END_DECLS).

While this has no ill effects with the glibc definitions of <stddef.h> and
<string.h>, it causes compilation errors when used with GNU Gnulib. Gnulib
augments <stddef.h> and <string.h> with additional declarations, by use of
#include_next. When these overridden header files are included from within an
extern "C++" { ... } block, with clang++, this leads to errors ("error:
declaration of 'memchr' has a different language linkage" etc.). See
<https://lists.gnu.org/archive/html/bug-gnulib/2024-07/msg00261.html>.

Find attached a fix, that moves the includes outside the extern "C++" { ... }
block.

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