A variant of

Subject: Re: 0 is not perl (was Re: Report /export/home/nwc10/Gripping-Smoke/Smoke)
Message-ID: <20030421235405.GA1162@ratsnest.hole>

to quench the black smoke from the BSD builds.

p4raw-id: //depot/perl@19445

1 files changed, 20 insertions, 10 deletions

diff --git a/lib/ExtUtils/MM_Unix.pm b/lib/ExtUtils/MM_Unix.pm
index 8e5b9b802a..fc7febcaa6 100644
--- a/lib/ExtUtils/MM_Unix.pm
+++ b/lib/ExtUtils/MM_Unix.pm
@@ -1170,14 +1170,16 @@ in these dirs:
 
     my $stderr_duped = 0;
     local *STDERR_COPY;
-    if( open(STDERR_COPY, '>&STDERR') ) {
-        $stderr_duped = 1;
-    }
-    else {
-        warn <<WARNING;
+    unless ($^O =~ /^(?:free|net|open)bsd|bsdos$/) { # Search for '51535'.
+	if( open(STDERR_COPY, '>&STDERR') ) {
+	    $stderr_duped = 1;
+	}
+	else {
+	    warn <<WARNING;
 find_perl() can't dup STDERR: $!
 You might see some garbage while we search for Perl
 WARNING
+        }
     }
 
     foreach $name (@$names){
@@ -1196,12 +1198,20 @@ WARNING
             next unless $self->maybe_command($abs);
             print "Executing $abs\n" if ($trace >= 2);
 
-            # To avoid using the unportable 2>&1 to supress STDERR,
-            # we close it before running the command.
-            close STDERR if $stderr_duped;
             my $version_check = qq{$abs -e "require $ver; print qq{VER_OK\n}"};
-            $val = `$version_check`;
-            open STDERR, '>&STDERR_COPY' if $stderr_duped;
+            # To avoid using the unportable 2>&1 to suppress STDERR,
+            # we close it before running the command.
+            # However, thanks to a thread library bug in many BSDs
+            # ( http://www.freebsd.org/cgi/query-pr.cgi?pr=51535 )
+            # we cannot use the fancier more portable way in here
+            # but instead need to use the traditional 2>&1 construct.
+            if ($^O =~ /^(?:free|net|open)bsd|bsdos$/) {
+                 $val = `$version_check 2>&1`;
+            } else {
+                close STDERR if $stderr_duped;
+                $val = `$version_check`;
+                open STDERR, '>&STDERR_COPY' if $stderr_duped;
+            }
             print STDERR "Perl version check failed: '$version_check'\n"
                 unless defined $val;