headers.patch

commit 0e30377471bb47e5600ca544049fd912b8fd6f1f
Author: Justin Crawford <Justin@stacksmash.net>
Date:   Sun Jun 7 05:33:08 2020 +0200

    Musl-libc patches

diff --git a/include/uapi/linux/libc-compat.h b/include/uapi/linux/libc-compat.h
index 8254c937c9f4..0636c2aa487c 100644
--- a/include/uapi/linux/libc-compat.h
+++ b/include/uapi/linux/libc-compat.h
@@ -49,10 +49,9 @@
 #ifndef _UAPI_LIBC_COMPAT_H
 #define _UAPI_LIBC_COMPAT_H
 
-/* We have included glibc headers... */
-#if defined(__GLIBC__)
+#ifndef __KERNEL__ /* we're used from userspace */
 
-/* Coordinate with glibc net/if.h header. */
+/* Coordinate with libc net/if.h header. */
 #if defined(_NET_IF_H) && defined(__USE_MISC)
 
 /* GLIBC headers included first so don't define anything
@@ -99,15 +98,7 @@
 #define __UAPI_DEF_IN_CLASS		0
 
 #define __UAPI_DEF_IN6_ADDR		0
-/* The exception is the in6_addr macros which must be defined
- * if the glibc code didn't define them. This guard matches
- * the guard in glibc/inet/netinet/in.h which defines the
- * additional in6_addr macros e.g. s6_addr16, and s6_addr32. */
-#if defined(__USE_MISC) || defined (__USE_GNU)
 #define __UAPI_DEF_IN6_ADDR_ALT		0
-#else
-#define __UAPI_DEF_IN6_ADDR_ALT		1
-#endif
 #define __UAPI_DEF_SOCKADDR_IN6		0
 #define __UAPI_DEF_IPV6_MREQ		0
 #define __UAPI_DEF_IPPROTO_V6		0
@@ -115,10 +106,10 @@
 #define __UAPI_DEF_IN6_PKTINFO		0
 #define __UAPI_DEF_IP6_MTUINFO		0
 
-#else
+#else /* defined(_NETINET_IN_H) */
 
 /* Linux headers included first, and we must define everything
- * we need. The expectation is that glibc will check the
+ * we need. The expectation is that the libc will check the
  * __UAPI_DEF_* defines and adjust appropriately. */
 #define __UAPI_DEF_IN_ADDR		1
 #define __UAPI_DEF_IN_IPPROTO		1
@@ -128,7 +119,7 @@
 #define __UAPI_DEF_IN_CLASS		1
 
 #define __UAPI_DEF_IN6_ADDR		1
-/* We unconditionally define the in6_addr macros and glibc must
+/* We unconditionally define the in6_addr macros and libc must
  * coordinate. */
 #define __UAPI_DEF_IN6_ADDR_ALT		1
 #define __UAPI_DEF_SOCKADDR_IN6		1
@@ -170,7 +161,7 @@
  * or we are being included in the kernel, then define everything
  * that we need. Check for previous __UAPI_* definitions to give
  * unsupported C libraries a way to opt out of any kernel definition. */
-#else /* !defined(__GLIBC__) */
+#else /* __KERNEL__ */
 
 /* Definitions for if.h */
 #ifndef __UAPI_DEF_IF_IFCONF
@@ -262,6 +253,6 @@
 #define __UAPI_DEF_XATTR		1
 #endif
 
-#endif /* __GLIBC__ */
+#endif /* __KERNEL__ */
 
 #endif /* _UAPI_LIBC_COMPAT_H */
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index f2acb2566333..5297d1c94f37 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -21,7 +21,9 @@
 #include <linux/types.h>
 #include <asm/byteorder.h>
 #include <linux/socket.h>
+#include <linux/libc-compat.h>
 
+#if __UAPI_DEF_TCPHDR
 struct tcphdr {
 	__be16	source;
 	__be16	dest;
@@ -56,6 +58,7 @@ struct tcphdr {
 	__sum16	check;
 	__be16	urg_ptr;
 };
+#endif
 
 /*
  *	The union cast uses a gcc extension to avoid aliasing problems