ensure PATH for test is not too long, as that is incompatible with win2k

t/make_executable.t

@@ -11,7 +11,7 @@ use Cwd qw/cwd/;
 
 my @test_vals = ( 0, 1, 2, 3, -1, -2, 65535, 65536, 65537, 47, 100, 200, 255, 256, 257, 258, 511, 512, 513, -255, -256, -20012001 );
 
-plan($OSNAME eq 'MSWin32' ? ( tests => (($#test_vals+1)*5)+1 ) : ( skip_all => 'Only usable on Windows' ));
+plan($OSNAME eq 'MSWin32' ? ( tests => (($#test_vals+1)*5)+2 ) : ( skip_all => 'Only usable on Windows' ));
 
 my $perl_in_fname = 'test_perl_source';
 
@@ -28,9 +28,10 @@ ok (-e "$batch_out_fname", qq{Executable file exists ("$batch_out_fname")});
 my $int_max_8bit = 2**8;
 my $int_max_16bit = 2**16;
 
+my $path_with_cwd = construct_test_PATH();
+
 foreach my $input_val ( @test_vals ) {
-    my $cwd = cwd;
-    local $ENV{PATH} = join $Config{path_sep}, $cwd, $ENV{PATH};
+    local $ENV{PATH} = $path_with_cwd;
     my $qx_output = q//;
     my $qx_retval = 0;
     my $error_level = 0;
@@ -60,3 +61,29 @@ foreach my $input_val ( @test_vals ) {
 }
 
 unlink $perl_in_fname, $batch_out_fname;
+
+# the test needs CWD in PATH to check the created .bat files, but under win2k
+# PATH may not be too long. so to keep any win2k smokers happy, we construct
+# a new PATH that contains the dirs which hold cmd.exe, perl.exe, and CWD
+
+sub construct_test_PATH {
+    my $perl_path = $^X;
+    my $cmd_path = $ENV{ComSpec} ||  `where cmd`; # doesn't seem to work on all windows versions
+    $_ =~ s/[\\\/][^\\\/]+$// for $perl_path, $cmd_path; # strip executable name
+
+    my @path_fallbacks = grep /\Q$ENV{SystemRoot}\E|system32|winnt|windows/i, split $Config{path_sep}, $ENV{PATH};
+
+    my $path_with_cwd = join $Config{path_sep}, @path_fallbacks, $cmd_path, $perl_path, cwd();
+
+    my ($perl) = ( $^X =~ /[\\\/]([^\\]+)$/ ); # in case the perl executable name differs
+    note "using perl executable name: $perl";
+
+    local $ENV{PATH} = $path_with_cwd;
+    my $test_out = `$perl -e 1 2>&1`;
+    is $test_out, "", "perl execution with temp path works"
+      or diag "make_executable.t tmp path: $path_with_cwd\n";
+    diag "make_executable.t PATH likely did not contain cmd.exe\n"
+      if !defined $test_out;
+
+    return $path_with_cwd;
+}