Use My::Platform

Put all path conversions in one file
Convert the --tmpdir  passed to "mysqld --verbose --help"

mysql-test/lib/My/Platform.pm

@@ -0,0 +1,95 @@
+# -*- cperl -*-
+# Copyright (C) 2004-2006 MySQL AB
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+package My::Platform;
+
+use strict;
+
+use base qw(Exporter);
+our @EXPORT= qw(IS_CYGWIN IS_WINDOWS IS_WIN32PERL
+		native_path posix_path mixed_path);
+
+BEGIN {
+  if ($^O eq "cygwin") {
+    # Make sure cygpath works
+    if ((system("cygpath > /dev/null 2>&1") >> 8) != 1){
+      die "Could not execute 'cygpath': $!";
+    }
+    eval 'sub IS_CYGWIN { 1 }';
+  }
+  else {
+    eval 'sub IS_CYGWIN { 0 }';
+  }
+  if ($^O eq "MSWin32") {
+    eval 'sub IS_WIN32PERL { 1 }';
+  }
+  else {
+    eval 'sub IS_WIN32PERL { 0 }';
+  }
+}
+
+BEGIN {
+  if (IS_CYGWIN or IS_WIN32PERL) {
+    eval 'sub IS_WINDOWS { 1 }';
+  }
+  else {
+    eval 'sub IS_WINDOWS { 0 }';
+  }
+}
+
+
+#
+# native_path
+# Convert from path format used by perl to the underlying
+# operating systems format
+#
+# NOTE
+#  Used when running windows binaries (that expect windows paths)
+#  in cygwin perl (that uses unix paths)
+#
+
+sub mixed_path {
+  my ($path)= @_;
+  if (IS_CYGWIN){
+    return unless defined $path;
+    $path= `cygpath -m $path`;
+    chomp $path;
+  }
+  return $path;
+}
+
+
+sub native_path {
+  my ($path)= @_;
+  $path=~ s/\//\\/g
+    if (IS_CYGWIN or IS_WIN32PERL);
+  return $path;
+}
+
+
+sub posix_path {
+  my ($path)= @_;
+  if (IS_CYGWIN){
+    return unless defined $path;
+    $path= `cygpath $path`;
+    chomp $path;
+  }
+  return $path;
+}
+
+
+
+1;