1 Append -pipe to CFLAGS.

     2 Will not send upstream.

     3 

     4 --- configure	2016-11-14 16:35:20.860772554 +0000

     5 +++ configure	2016-11-14 16:35:42.301383478 +0000

     6 @@ -17146,7 +17146,7 @@

     7  { $as_echo "$as_me:$LINENO: checking for gcc optimization flags" >&5

     8  $as_echo_n "checking for gcc optimization flags... " >&6; }

     9  old_cflags=$CFLAGS

    10 -CFLAGS="$CFLAGS -pipe"

    11 +CFLAGS="$CFLAGS"

    12  cat >conftest.$ac_ext <<_ACEOF

    13  /* confdefs.h.  */

    14  _ACEOF

    15 @@ -17180,7 +17180,7 @@

    16  	 test -z "$ac_c_werror_flag" ||

    17  	 test ! -s conftest.err

    18         } && test -s conftest.$ac_objext; then

    19 -   EXTRA_OPT_CFLAGS="-pipe"

    20 +   EXTRA_OPT_CFLAGS=""

    21  else

    22    $as_echo "$as_me: failed program was:" >&5

    23  sed 's/^/| /' conftest.$ac_ext >&5