config/kernel-stdarg.m4

   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 ])