make driver test verbose for debugging

tools/driver/test_scripts/driver_inputs_test_2___two_bad_pathnames.bash

@@ -1,21 +1,21 @@
 #!/bin/bash
-
+set -x
 ### ensure that when _two_ non-existant input pathnames are given, each one results in an error output that mentions that pathname.
 
 
 
-source $(dirname "`realpath "${BASH_SOURCE[0]}"`")/driver_inputs_test___shared_code.bash
+source $(dirname "$(realpath "${BASH_SOURCE[0]}")")/driver_inputs_test___shared_code.bash
 
 check_for_inadvisable_sourcing; returned=$?
 if [ $returned -ne 0 ]; then return $returned; fi ### simulating exception handling for an exception that is not caught at this level
 
 
 
-humanReadable_test_pathname="`resolve_symlink_only_of_basename "$0"`"
+humanReadable_test_pathname="$(resolve_symlink_only_of_basename "$0")"
 
 
 
-if ! P4C=`try_to_find_the_driver`; then
+if ! P4C=$(try_to_find_the_driver); then
   echo "Unable to find the driver of the P4 compiler.  Aborting the test ''$humanReadable_test_pathname'' with a non-zero exit code.  This test failed." >& 2
   exit 255
 fi

tools/driver/test_scripts/driver_inputs_test___shared_code.bash

@@ -20,11 +20,10 @@ function check_for_inadvisable_sourcing {
 ### If you call it withOUT a parameter, I don`t know exactly what will happen, but I don`t think it will be _good_. ;-)
 
 function resolve_symlink_only_of_basename {
-  echo "`dirname "$1"`"/"$(basename `realpath "$1"`)"
+  echo "$(dirname "$1")/$(basename $(realpath "$1"))"
 }
 
 
-
 function check_for_pathname_error_in_P4_compiler_driver_output {
   ### required arg. #1: pathname         _of_ the driver [can be relative]
   ### required arg. #2: pathname to give _to_ the driver [can be relative]
@@ -34,7 +33,7 @@ function check_for_pathname_error_in_P4_compiler_driver_output {
   "$1" "$2" 2>& 1 | grep --ignore-case --quiet "error.*$2"
   exit_status_from_grep=$?
 
-  echo -n "Subtest #$3 (out of $4) in the test script ''`resolve_symlink_only_of_basename "$0"`'' " ### DRY
+  echo -n "Subtest #$3 (out of $4) in the test script ''$(resolve_symlink_only_of_basename "$0")'' " ### DRY
   if [ $exit_status_from_grep -eq 0 ]; then
     echo 'succeeded.'
     return 0
@@ -105,6 +104,7 @@ function check_if_this_seems_to_be_our_driver {
     ###   than flooding the output with “INFO: searching for the P4 compiler driver”[...] lines.
 
   fi ### Done checking for a symlink.  At this point, "$1" is either (1) _not_ a symlink or (2) a symlink we couldn`t canonicalize.
+  printf "INFO: '$1' is a symlink to '%s'\n" "$(realpath "$1")" >& 2
 
   if [ ! -e "$1" ]; then echo "INFO: not using ''$1'', because it is not found in the filesystem [starting at ''$PWD'', if that is a relative pathname]." >& 2; return 1; fi
   if [ ! -x "$1" ]; then echo "INFO: not using ''$1'', because it is not executable." >& 2; return 2; fi