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dnl #
dnl # Linux 5.15 gets rid of -isystem and external <stdarg.h> inclusion
dnl # and ships its own <linux/stdarg.h>. Check if this header file does
dnl # exist and provide all necessary definitions for variable argument
dnl # functions. Adjust the inclusion of <stdarg.h> according to the
dnl # results.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG], [
ZFS_LINUX_TEST_SRC([has_standalone_linux_stdarg], [
#include <linux/stdarg.h>
#if !defined(va_start) || !defined(va_end) || \
!defined(va_arg) || !defined(va_copy)
#error "<linux/stdarg.h> is invalid"
#endif
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG], [
dnl #
dnl # Linux 5.15 ships its own stdarg.h and doesn't allow to
dnl # include compiler headers.
dnl #
AC_MSG_CHECKING([whether standalone <linux/stdarg.h> exists])
ZFS_LINUX_TEST_RESULT([has_standalone_linux_stdarg], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_STANDALONE_LINUX_STDARG, 1,
[standalone <linux/stdarg.h> exists])
],[
AC_MSG_RESULT([no])
])
])
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