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-rw-r--r--target/linux/generic/patches-4.9/271-uapi-libc-compat.h-do-not-rely-on-__GLIBC__.patch107
1 files changed, 107 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.9/271-uapi-libc-compat.h-do-not-rely-on-__GLIBC__.patch b/target/linux/generic/patches-4.9/271-uapi-libc-compat.h-do-not-rely-on-__GLIBC__.patch
new file mode 100644
index 0000000..ff47e75
--- /dev/null
+++ b/target/linux/generic/patches-4.9/271-uapi-libc-compat.h-do-not-rely-on-__GLIBC__.patch
@@ -0,0 +1,107 @@
+From f972afc2509eebcb00d370256c55b112a3b5ffca Mon Sep 17 00:00:00 2001
+From: David Heidelberger <david.heidelberger@ixit.cz>
+Date: Mon, 29 Jun 2015 16:50:40 +0200
+Subject: [PATCH 2/3] uapi/libc-compat.h: do not rely on __GLIBC__
+
+Musl provides the same structs as glibc, but does not provide a define to
+allow its detection. Since the absence of __GLIBC__ also can mean that it
+is included from the kernel, change the __GLIBC__ detection to
+!__KERNEL__, which should always be true when included from userspace.
+
+Signed-off-by: John Spencer <maillist-linux@barfooze.de>
+Tested-by: David Heidelberger <david.heidelberger@ixit.cz>
+Signed-off-by: Jonas Gorski <jogo@openwrt.org>
+---
+ include/uapi/linux/libc-compat.h | 18 +++++++++---------
+ 1 file changed, 9 insertions(+), 9 deletions(-)
+
+--- a/include/uapi/linux/libc-compat.h
++++ b/include/uapi/linux/libc-compat.h
+@@ -48,13 +48,13 @@
+ #ifndef _UAPI_LIBC_COMPAT_H
+ #define _UAPI_LIBC_COMPAT_H
+
+-/* We have included glibc headers... */
+-#if defined(__GLIBC__)
++/* We have included libc headers... */
++#if !defined(__KERNEL__)
+
+-/* Coordinate with glibc net/if.h header. */
+-#if defined(_NET_IF_H) && defined(__USE_MISC)
++/* Coordinate with libc net/if.h header. */
++#if defined(_NET_IF_H) && (!defined(__GLIBC__) || defined(__USE_MISC))
+
+-/* GLIBC headers included first so don't define anything
++/* LIBC headers included first so don't define anything
+ * that would already be defined. */
+
+ #define __UAPI_DEF_IF_IFCONF 0
+@@ -65,7 +65,11 @@
+ #define __UAPI_DEF_IF_NET_DEVICE_FLAGS 0
+ /* For the future if glibc adds IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO */
+ #ifndef __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO
++#ifdef __GLIBC__
+ #define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1
++#else
++#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 0
++#endif
+ #endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO */
+
+ #else /* _NET_IF_H */
+@@ -85,10 +89,10 @@
+
+ #endif /* _NET_IF_H */
+
+-/* Coordinate with glibc netinet/in.h header. */
++/* Coordinate with libc netinet/in.h header. */
+ #if defined(_NETINET_IN_H)
+
+-/* GLIBC headers included first so don't define anything
++/* LIBC headers included first so don't define anything
+ * that would already be defined. */
+ #define __UAPI_DEF_IN_ADDR 0
+ #define __UAPI_DEF_IN_IPPROTO 0
+@@ -102,7 +106,7 @@
+ * 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)
++#if !defined(__GLIBC__) || defined(__USE_MISC) || defined (__USE_GNU)
+ #define __UAPI_DEF_IN6_ADDR_ALT 0
+ #else
+ #define __UAPI_DEF_IN6_ADDR_ALT 1
+@@ -117,7 +121,7 @@
+ #else
+
+ /* 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
+@@ -127,7 +131,7 @@
+ #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 the libc must
+ * coordinate. */
+ #define __UAPI_DEF_IN6_ADDR_ALT 1
+ #define __UAPI_DEF_SOCKADDR_IN6 1
+@@ -168,7 +172,7 @@
+ /* If we did not see any headers from any supported C libraries,
+ * or we are being included in the kernel, then define everything
+ * that we need. */
+-#else /* !defined(__GLIBC__) */
++#else /* defined(__KERNEL__) */
+
+ /* Definitions for if.h */
+ #define __UAPI_DEF_IF_IFCONF 1
+@@ -208,6 +212,6 @@
+ /* Definitions for xattr.h */
+ #define __UAPI_DEF_XATTR 1
+
+-#endif /* __GLIBC__ */
++#endif /* __KERNEL__ */
+
+ #endif /* _UAPI_LIBC_COMPAT_H */