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In: https://sourceware.org/glibc/wiki/Synchronizing_Headers we explain how we synchronize our headers with Linux kernel headers. In order to synchronize with the Linux linux/in6.h and linux/ipv6.h headers we checked for their guard macros and then defined __USE_KERNEL_IPV6_DEFS and conditionalized code on this macro. In upstream kernel 56c176c9 the _UAPI prefix was stripped and this broke our synchronized headers again. We now need to check for _LINUX_IN6_H and _IPV6_H, and keep checking the old versions of the header guard checks for maximum backwards compatibility with older Linux headers (the history is actually a bit muddled here and it appears upstream linus kernel broke this 10 months *before* our fix was ever applied to glibc, but without glibc testing we didn't notice and distro kernels have their own testing to fix this). This patch fixes synchronization with linux/in6.h and with netinet/in.h. |
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