mirror of https://github.com/hak5/openwrt.git
103 lines
3.4 KiB
Diff
103 lines
3.4 KiB
Diff
From c6bdd0d302119819de72439972d0462c26ef9eda Mon Sep 17 00:00:00 2001
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From: Felix Janda <felix.janda@posteo.de>
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Date: Sun, 12 Nov 2017 13:30:17 -0500
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Subject: uapi libc compat: add fallback for unsupported libcs
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libc-compat.h aims to prevent symbol collisions between uapi and libc
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headers for each supported libc. This requires continuous coordination
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between them.
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The goal of this commit is to improve the situation for libcs (such as
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musl) which are not yet supported and/or do not wish to be explicitly
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supported, while not affecting supported libcs. More precisely, with
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this commit, unsupported libcs can request the suppression of any
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specific uapi definition by defining the correspondings _UAPI_DEF_*
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macro as 0. This can fix symbol collisions for them, as long as the
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libc headers are included before the uapi headers. Inclusion in the
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other order is outside the scope of this commit.
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All infrastructure in order to enable this fallback for unsupported
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libcs is already in place, except that libc-compat.h unconditionally
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defines all _UAPI_DEF_* macros to 1 for all unsupported libcs so that
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any previous definitions are ignored. In order to fix this, this commit
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merely makes these definitions conditional.
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This commit together with the musl libc commit
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http://git.musl-libc.org/cgit/musl/commit/?id=04983f2272382af92eb8f8838964ff944fbb8258
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fixes for example the following compiler errors when <linux/in6.h> is
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included after musl's <netinet/in.h>:
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./linux/in6.h:32:8: error: redefinition of 'struct in6_addr'
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./linux/in6.h:49:8: error: redefinition of 'struct sockaddr_in6'
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./linux/in6.h:59:8: error: redefinition of 'struct ipv6_mreq'
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The comments referencing glibc are still correct, but this file is not
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only used for glibc any more.
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Signed-off-by: Felix Janda <felix.janda@posteo.de>
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Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de>
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---
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include/uapi/linux/libc-compat.h | 55 +++++++++++++++++++++++++++++++++++++++-
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1 file changed, 54 insertions(+), 1 deletion(-)
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--- a/include/uapi/linux/libc-compat.h
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+++ b/include/uapi/linux/libc-compat.h
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@@ -110,27 +110,54 @@
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/* If we did not see any headers from any supported C libraries,
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* or we are being included in the kernel, then define everything
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- * that we need. */
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+ * that we need. Check for previous __UAPI_* definitions to give
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+ * unsupported C libraries a way to opt out of any kernel definition. */
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#else /* !defined(__GLIBC__) */
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/* Definitions for in.h */
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+#ifndef __UAPI_DEF_IN_ADDR
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#define __UAPI_DEF_IN_ADDR 1
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+#endif
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+#ifndef __UAPI_DEF_IN_IPPROTO
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#define __UAPI_DEF_IN_IPPROTO 1
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+#endif
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+#ifndef __UAPI_DEF_IN_PKTINFO
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#define __UAPI_DEF_IN_PKTINFO 1
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+#endif
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+#ifndef __UAPI_DEF_IP_MREQ
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#define __UAPI_DEF_IP_MREQ 1
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+#endif
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+#ifndef __UAPI_DEF_SOCKADDR_IN
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#define __UAPI_DEF_SOCKADDR_IN 1
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+#endif
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+#ifndef __UAPI_DEF_IN_CLASS
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#define __UAPI_DEF_IN_CLASS 1
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+#endif
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/* Definitions for in6.h */
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+#ifndef __UAPI_DEF_IN6_ADDR
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#define __UAPI_DEF_IN6_ADDR 1
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+#endif
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+#ifndef __UAPI_DEF_IN6_ADDR_ALT
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#define __UAPI_DEF_IN6_ADDR_ALT 1
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+#endif
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+#ifndef __UAPI_DEF_SOCKADDR_IN6
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#define __UAPI_DEF_SOCKADDR_IN6 1
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+#endif
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+#ifndef __UAPI_DEF_IPV6_MREQ
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#define __UAPI_DEF_IPV6_MREQ 1
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+#endif
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+#ifndef __UAPI_DEF_IPPROTO_V6
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#define __UAPI_DEF_IPPROTO_V6 1
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+#endif
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+#ifndef __UAPI_DEF_IPV6_OPTIONS
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#define __UAPI_DEF_IPV6_OPTIONS 1
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+#endif
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/* Definitions for xattr.h */
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+#ifndef __UAPI_DEF_XATTR
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#define __UAPI_DEF_XATTR 1
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+#endif
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#endif /* __GLIBC__ */
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