contrib: sync dg-extract-results.sh with GCC

This syncs dg-extract-results.sh with GCC.

It contains two commits: r14-4333-g346f5991569fae and r14-9393-g64273a7e6bd8ba.

contrib/ChangeLog:
	* dg-extract-results.sh: Sync with GCC.

Approved-By: Tom Tromey <tom@tromey.com>

contrib/ChangeLog

@@ -1,6 +1,7 @@
 2024-03-11  Sam James  <sam@gentoo.org>
 
 	* dg-extract-results.py: Sync with GCC.
+	* dg-extract-results.sh: Sync with GCC.
 
 2020-09-25  Simon Marchi  <simon.marchi@polymtl.ca>
 

contrib/dg-extract-results.sh

@@ -6,7 +6,7 @@
 # The resulting file can be used with test result comparison scripts for
 # results from tests that were run in parallel.  See usage() below.
 
-# Copyright (C) 2008, 2009, 2010, 2012 Free Software Foundation
+# Copyright (C) 2008-2024 Free Software Foundation, Inc.
 # Contributed by Janis Johnson <janis187@us.ibm.com>
 #
 # This file is part of GCC.
@@ -28,14 +28,17 @@
 
 PROGNAME=dg-extract-results.sh
 
-# Try to use the python version if possible, since it tends to be faster.
+# Try to use the python version if possible, since it tends to be faster and
+# produces more stable results.
 PYTHON_VER=`echo "$0" | sed 's/sh$/py/'`
-if test "$PYTHON_VER" != "$0" &&
-   test -f "$PYTHON_VER" &&
-   python -c 'import sys, getopt, re, io, datetime, operator; sys.exit (0 if sys.version_info >= (2, 6) else 1)' \
-     > /dev/null 2> /dev/null; then
-  exec python $PYTHON_VER "$@"
-fi
+for python in python3 python python2 ; do
+  if test "$PYTHON_VER" != "$0" &&
+     test -f "$PYTHON_VER" &&
+     ${python} -c 'import sys, getopt, re, io, datetime, operator; sys.exit (0 if sys.version_info >= (2, 6) else 1)' \
+       > /dev/null 2> /dev/null; then
+    exec ${python} $PYTHON_VER "$@"
+  fi
+done
 
 usage() {
   cat <<EOF >&2
@@ -271,7 +274,7 @@ cat $SUM_FILES \
 
 # Write the begining of the combined summary file.
 
-head -n 2 $FIRST_SUM
+head -n 3 $FIRST_SUM
 echo
 echo "		=== $TOOL tests ==="
 echo