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sunrpc: Suppress clang -Wgnu-variable-sized-type-not-at-end warning on struct cmessage 

clang issues:

svc_unix.c:318:18: error: field 'cmsg' with variable sized type 'struct cmsghdr' not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end]
  318 |   struct cmsghdr cmsg;
      |                  ^

The __msgread explicitly expects that 'struct ucred' is after the 'cmsg',
so suppress the warning.

Reviewed-by: Sam James <sam@gentoo.org>
This commit is contained in:
Adhemerval Zanella 2025-10-17 16:12:47 -03:00
parent c6278687d9
commit 6eb1d9a9ed
1 changed files with 7 additions and 0 deletions
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7
sunrpc/svc_unix.c
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@ -65,6 +65,7 @@
#include <libintl.h>
#include <wchar.h>
#include <shlib-compat.h>
#include <libc-diag.h>
/*
* Ops vector for AF_UNIX based rpc service handle
@ -308,12 +309,18 @@ svcunix_destroy (SVCXPRT *xprt)
}
#ifdef SCM_CREDENTIALS
/* clang complains if a flexible array member (struct cmsghdr) is not a the
end of the struct (it is a GNU extension). The __msgread explicitly
expects that 'struct ucred' is after the 'cmsg', so disable the warning. */
DIAG_PUSH_NEEDS_COMMENT_CLANG;
DIAG_IGNORE_NEEDS_COMMENT_CLANG (18, "-Wgnu-variable-sized-type-not-at-end");
struct cmessage {
struct cmsghdr cmsg;
struct ucred cmcred;
/* hack to make sure we have enough memory */
char dummy[(CMSG_ALIGN (sizeof (struct ucred)) - sizeof (struct ucred) + sizeof (long))];
};
DIAG_POP_NEEDS_COMMENT_CLANG;
/* XXX This is not thread safe, but since the main functions in svc.c
and the rpcgen generated *_svc functions for the daemon are also not