Jinoh Kang : ws2_32: Avoid relying on linux/ipx.h to define SOL_IPX.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0deab78dc5ea69245c73d08ac7da52c9cef8313d
URL:    https://gitlab.winehq.org/wine/wine/-/commit/0deab78dc5ea69245c73d08ac7da52c...

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

ws2_32: 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: da4e359a700209c840490483f5337a14aa1d448f

---

dlls/ws2_32/unixlib.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/ws2_32/unixlib.c b/dlls/ws2_32/unixlib.c
index 5cb64aad258..db36f18c7bd 100644
--- a/dlls/ws2_32/unixlib.c
+++ b/dlls/ws2_32/unixlib.c
@@ -75,7 +75,9 @@
 #  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