replace |& which is not widely supported (#1399)

The test_all.sh script currently runs cpp tests using g++.
This is not good for the following reasons:
* During normal DaCe compilation we use cmake (and thus whatever compiler cmake picks up).
* We don't check if g++ is available.

This change uses whatever the user set as CXX env var. Cmake also uses CXX when it is set.
Thus if a user sets CXX, he will use the same compiler for tests and during dace compilation.
If CXX is not set we fall back to g++ as the hard-coded compiler.

The test script also prints the current progress before each test now.

test_all.sh

@@ -3,6 +3,12 @@
 
 set -a
 
+if [[ -z "${CXX}" ]]; then
+  CXX="g++" # I don't think that is a good default, but it was the hardcoded compiler before I made changes...
+else
+  CXX="${CXX}"
+fi
+
 SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
 PYTHONPATH=$SCRIPTPATH
 
@@ -53,7 +59,7 @@ bail_skip() {
 test_start() {
     TESTS=`expr $TESTS + 1`
     CURTEST="$TESTPREFIX$1"
-    echo "---------- TEST: $TESTPREFIX$1 ----------"
+    echo "---------- TEST: $TESTPREFIX$1 ---------- [ This is test $TESTS of $TOTAL_TESTS ]"
 }
 
 testcmd() {
@@ -64,14 +70,14 @@ testcmd() {
     #$* | tee -a test.log
     TESTCNT=`expr $TESTS - 1`
     MSG="($TESTCNT / $TOTAL_TESTS) $CURTEST (Fails: $ERRORS)"
-    ($* || echo "_TFAIL_ $?") |& awk "BEGIN{printf \"$MSG\r\"} /_TFAIL_/{printf \"$TGAP\r\"; exit \$NF} {printf \"$TGAP\r\"; print; printf \"$MSG\r\";} END{printf \"$TGAP\r\"}"
+    ($* || echo "_TFAIL_ $?") 2>&1 | awk "BEGIN{printf \"$MSG\r\"} /_TFAIL_/{printf \"$TGAP\r\"; exit \$NF} {printf \"$TGAP\r\"; print; printf \"$MSG\r\";} END{printf \"$TGAP\r\"}"
 }
 
 ################################################
 
 runtest_cpp() {
     test_start $1
-    testcmd g++ -std=c++14 -Wall -Wextra -O3 -march=native -ffast-math -fopenmp -fPIC \
+    testcmd $CXX -std=c++14 -Wall -Wextra -O3 -march=native -ffast-math -fopenmp -fPIC \
         -I $SCRIPTPATH/dace/runtime/include $1 -o ./$1.out
     if [ $? -ne 0 ]; then bail "$1 (compilation)"; fi
     testcmd ./$1.out