buildtools: output build failure reason to stderr

If build fails because of failed experimental check and stdout is
redirected to /dev/null, it is absolutely unclear why build fails.

Fixes: a4bcd61de82d ("buildtools: add script to check experimental API exports")

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>

diff --git a/buildtools/check-experimental-syms.sh b/buildtools/check-experimental-syms.sh
index 7d21de3..5bc8cda 100755 (executable)
--- a/buildtools/check-experimental-syms.sh
+++ b/buildtools/check-experimental-syms.sh
@@ -22,9 +22,11 @@ do
        IN_EXP=$?
        if [ $IN_TEXT -eq 0 -a $IN_EXP -ne 0 ]
        then
-               echo "$SYM is not flagged as experimental"
-               echo "but is listed in version map"
-               echo "Please add __rte_experimental to the definition of $SYM"
+               cat >&2 <<- END_OF_MESSAGE
+               $SYM is not flagged as experimental
+               but is listed in version map
+               Please add __rte_experimental to the definition of $SYM
+               END_OF_MESSAGE
                exit 1
        fi
 done