diff options
Diffstat (limited to 'target/linux/generic/pending-4.4/270-uapi-libc-compat-add-fallback-for-unsupported-libcs.patch')
| -rw-r--r-- | target/linux/generic/pending-4.4/270-uapi-libc-compat-add-fallback-for-unsupported-libcs.patch | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.4/270-uapi-libc-compat-add-fallback-for-unsupported-libcs.patch b/target/linux/generic/pending-4.4/270-uapi-libc-compat-add-fallback-for-unsupported-libcs.patch new file mode 100644 index 0000000..06ad9bb --- /dev/null +++ b/target/linux/generic/pending-4.4/270-uapi-libc-compat-add-fallback-for-unsupported-libcs.patch @@ -0,0 +1,130 @@ +From c6bdd0d302119819de72439972d0462c26ef9eda Mon Sep 17 00:00:00 2001 +From: Felix Janda <felix.janda@posteo.de> +Date: Sun, 12 Nov 2017 13:30:17 -0500 +Subject: uapi libc compat: add fallback for unsupported libcs + +libc-compat.h aims to prevent symbol collisions between uapi and libc +headers for each supported libc. This requires continuous coordination +between them. + +The goal of this commit is to improve the situation for libcs (such as +musl) which are not yet supported and/or do not wish to be explicitly +supported, while not affecting supported libcs. More precisely, with +this commit, unsupported libcs can request the suppression of any +specific uapi definition by defining the correspondings _UAPI_DEF_* +macro as 0. This can fix symbol collisions for them, as long as the +libc headers are included before the uapi headers. Inclusion in the +other order is outside the scope of this commit. + +All infrastructure in order to enable this fallback for unsupported +libcs is already in place, except that libc-compat.h unconditionally +defines all _UAPI_DEF_* macros to 1 for all unsupported libcs so that +any previous definitions are ignored. In order to fix this, this commit +merely makes these definitions conditional. + +This commit together with the musl libc commit + +http://git.musl-libc.org/cgit/musl/commit/?id=04983f2272382af92eb8f8838964ff944fbb8258 + +fixes for example the following compiler errors when <linux/in6.h> is +included after musl's <netinet/in.h>: + +./linux/in6.h:32:8: error: redefinition of 'struct in6_addr' +./linux/in6.h:49:8: error: redefinition of 'struct sockaddr_in6' +./linux/in6.h:59:8: error: redefinition of 'struct ipv6_mreq' + +The comments referencing glibc are still correct, but this file is not +only used for glibc any more. + +Signed-off-by: Felix Janda <felix.janda@posteo.de> +Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de> +--- + include/uapi/linux/libc-compat.h | 55 +++++++++++++++++++++++++++++++++++++++- + 1 file changed, 54 insertions(+), 1 deletion(-) + +--- a/include/uapi/linux/libc-compat.h ++++ b/include/uapi/linux/libc-compat.h +@@ -148,39 +148,82 @@ + + /* 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. */ ++ * 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__) */ + + /* Definitions for if.h */ ++#ifndef __UAPI_DEF_IF_IFCONF + #define __UAPI_DEF_IF_IFCONF 1 ++#endif ++#ifndef __UAPI_DEF_IF_IFMAP + #define __UAPI_DEF_IF_IFMAP 1 ++#endif ++#ifndef __UAPI_DEF_IF_IFNAMSIZ + #define __UAPI_DEF_IF_IFNAMSIZ 1 ++#endif ++#ifndef __UAPI_DEF_IF_IFREQ + #define __UAPI_DEF_IF_IFREQ 1 ++#endif + /* Everything up to IFF_DYNAMIC, matches net/if.h until glibc 2.23 */ ++#ifndef __UAPI_DEF_IF_NET_DEVICE_FLAGS + #define __UAPI_DEF_IF_NET_DEVICE_FLAGS 1 ++#endif + /* 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 + #define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 1 ++#endif + + /* Definitions for in.h */ ++#ifndef __UAPI_DEF_IN_ADDR + #define __UAPI_DEF_IN_ADDR 1 ++#endif ++#ifndef __UAPI_DEF_IN_IPPROTO + #define __UAPI_DEF_IN_IPPROTO 1 ++#endif ++#ifndef __UAPI_DEF_IN_PKTINFO + #define __UAPI_DEF_IN_PKTINFO 1 ++#endif ++#ifndef __UAPI_DEF_IP_MREQ + #define __UAPI_DEF_IP_MREQ 1 ++#endif ++#ifndef __UAPI_DEF_SOCKADDR_IN + #define __UAPI_DEF_SOCKADDR_IN 1 ++#endif ++#ifndef __UAPI_DEF_IN_CLASS + #define __UAPI_DEF_IN_CLASS 1 ++#endif + + /* Definitions for in6.h */ ++#ifndef __UAPI_DEF_IN6_ADDR + #define __UAPI_DEF_IN6_ADDR 1 ++#endif ++#ifndef __UAPI_DEF_IN6_ADDR_ALT + #define __UAPI_DEF_IN6_ADDR_ALT 1 ++#endif ++#ifndef __UAPI_DEF_SOCKADDR_IN6 + #define __UAPI_DEF_SOCKADDR_IN6 1 ++#endif ++#ifndef __UAPI_DEF_IPV6_MREQ + #define __UAPI_DEF_IPV6_MREQ 1 ++#endif ++#ifndef __UAPI_DEF_IPPROTO_V6 + #define __UAPI_DEF_IPPROTO_V6 1 ++#endif ++#ifndef __UAPI_DEF_IPV6_OPTIONS + #define __UAPI_DEF_IPV6_OPTIONS 1 ++#endif ++#ifndef __UAPI_DEF_IN6_PKTINFO + #define __UAPI_DEF_IN6_PKTINFO 1 ++#endif ++#ifndef __UAPI_DEF_IP6_MTUINFO + #define __UAPI_DEF_IP6_MTUINFO 1 ++#endif + + /* Definitions for xattr.h */ ++#ifndef __UAPI_DEF_XATTR + #define __UAPI_DEF_XATTR 1 ++#endif + + #endif /* __GLIBC__ */ + |