Jinoh Kang : server: Avoid relying on linux/ipx.h to define SOL_IPX.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 915c3910143a83913db8d9bed8e8c97edc863beb
URL:    https://gitlab.winehq.org/wine/wine/-/commit/915c3910143a83913db8d9bed8e8c97...

Author: Jinoh Kang 
Date:   Thu Jul 27 22:39:50 2023 +0900

server: Avoid relying on linux/ipx.h to define SOL_IPX.

musl libc doesn't supply any definitions for IPX, such as the SOL_IPX
macro.  However, it still provides linux/ipx.h from Linux uAPI header
files if it exists.

Linux kernel wouldn't drop linux/ipx.h from uAPI headers until 5.15,
although IPX support has already been marked obsolete since 2018.

Fix this by not defining HAS_IPX if linux/ipx.h has been included but
nothing defines the SOL_IPX macro.

Status of IPX support from other libcs are noted below:

- bionic: netipx/ipx.h does not exist.  linux/ipx.h may or may not
  exist.  Note that sys/socket.h defines SOL_IPX even if linux/ipx.h is
  missing.

- glibc: netipx/ipx.h exists.  In this case, Wine assumes IPX support
  even if the operating system does not support it in runtime.

- BSD variants: netipx/ipx.h may or may not exist.  linux/ipx.h does not
  exist.  Some BSDs supply SO_DEFAULT_HEADERS instead of SOL_IPX.

Fixes: 41cc117b3f37ab4b9b4ac8a815cd2a496d38fb4b

---

server/sock.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/server/sock.c b/server/sock.c
index 550fe61e477..ce95b7f2998 100644
--- a/server/sock.c
+++ b/server/sock.c
@@ -71,7 +71,9 @@
 #  include <linux/types.h>
 # endif
 # include <linux/ipx.h>
-# define HAS_IPX
+# ifdef SOL_IPX
+#  define HAS_IPX
+# endif
 #endif

#ifdef HAVE_LINUX_IRDA_H