The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/kernel-stdarg.m4

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    1 dnl #
    2 dnl # Linux 5.15 gets rid of -isystem and external <stdarg.h> inclusion
    3 dnl # and ships its own <linux/stdarg.h>. Check if this header file does
    4 dnl # exist and provide all necessary definitions for variable argument
    5 dnl # functions. Adjust the inclusion of <stdarg.h> according to the
    6 dnl # results.
    7 dnl #
    8 AC_DEFUN([ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG], [
    9         ZFS_LINUX_TEST_SRC([has_standalone_linux_stdarg], [
   10                 #include <linux/stdarg.h>
   11 
   12                 #if !defined(va_start) || !defined(va_end) || \
   13                     !defined(va_arg) || !defined(va_copy)
   14                 #error "<linux/stdarg.h> is invalid"
   15                 #endif
   16         ],[])
   17 ])
   18 
   19 AC_DEFUN([ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG], [
   20         dnl #
   21         dnl # Linux 5.15 ships its own stdarg.h and doesn't allow to
   22         dnl # include compiler headers.
   23         dnl #
   24         AC_MSG_CHECKING([whether standalone <linux/stdarg.h> exists])
   25         ZFS_LINUX_TEST_RESULT([has_standalone_linux_stdarg], [
   26                 AC_MSG_RESULT([yes])
   27                 AC_DEFINE(HAVE_STANDALONE_LINUX_STDARG, 1,
   28                         [standalone <linux/stdarg.h> exists])
   29         ],[
   30                 AC_MSG_RESULT([no])
   31         ])
   32 ])

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