/usr/src/zfs-0.7.5/config/user-no-format-truncation.m4 is in zfs-dkms 0.7.5-1ubuntu15.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | dnl #
dnl # Check if gcc supports -Wno-format-truncation option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_USER_NO_FORMAT_TRUNCATION], [
AC_MSG_CHECKING([for -Wno-format-truncation support])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -Wno-format-truncation"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])],
[
NO_FORMAT_TRUNCATION=-Wno-format-truncation
AC_MSG_RESULT([yes])
],
[
NO_FORMAT_TRUNCATION=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_FORMAT_TRUNCATION])
])
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