Search for GNU-compatible dd for self-tests.
This checks for a dd that supports iflag=fullblock oflag=append,
and looks at gdd and dd for now, and warns of failing self-tests
if neither supports these two flags.
Signed-off-by: Matthias Andree <matthias.andree@gmx.de>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/configure.ac b/configure.ac
index 4ede01c..f69a193 100644
--- a/configure.ac
+++ b/configure.ac
@@ -945,6 +945,25 @@
sys/un.h
sys/wait.h
]))
+dnl Check where to find a dd(1) that supports iflag=fullblock
+dnl and oflag=append
+AC_MSG_CHECKING([for a dd(1) program that supports iflag=fullblock])
+DD=
+for i in dd gdd ; do
+ if "$i" if=/dev/null of=/dev/null count=1 bs=10k 2>/dev/null iflag=fullblock oflag=append ; then
+ DD=$i
+ break
+ fi
+done
+if test -n "$DD" ; then
+ AC_MSG_RESULT([$DD])
+else
+ AC_MSG_RESULT([not found, using dd])
+ DD=dd
+ AC_MSG_WARN([No GNU-compatible dd(1) program found, expect some self-test failures.])
+fi
+AC_SUBST([DD])
+
AC_CHECK_HEADERS(net/if.h,,,
[[
#if HAVE_SYS_TYPES_H