perl: use "use warnings" instead of -w

Change the Perl scripts to turn on lexical warnings instead of setting
the global $^W variable via the -w switch.

The -w sets warnings for all code that interpreter runs, while "use
warnings" is lexically scoped. The former is probably not what the
authors wanted.

As an auxiliary benefit it's now possible to build Git with:

    PERL_PATH='/usr/bin/env perl'

Which would previously result in failures, since "#!/usr/bin/env perl -w"
doesn't work as a shebang.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

7 files changed, 10 insertions, 7 deletions

diff --git a/contrib/examples/git-svnimport.perl b/contrib/examples/git-svnimport.perl
index 4576c4a86..ead4c04d3 100755
--- a/contrib/examples/git-svnimport.perl
+++ b/contrib/examples/git-svnimport.perl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 # This tool is copyright (c) 2005, Matthias Urlichs.
 # It is released under the Gnu Public License, version 2.
diff --git a/contrib/fast-import/import-directories.perl b/contrib/fast-import/import-directories.perl
index 3a5da4ab0..7f3afa5ac 100755
--- a/contrib/fast-import/import-directories.perl
+++ b/contrib/fast-import/import-directories.perl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 #
 # Copyright 2008-2009 Peter Krefting <peter@softwolves.pp.se>
 #
@@ -140,6 +140,7 @@ by whitespace or other characters.
 
 # Globals
 use strict;
+use warnings;
 use integer;
 my $crlfmode = 0;
 my @revs;
diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index a96fb5315..77f60fa39 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -1,7 +1,8 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 use 5.008;
 use strict;
+use warnings;
 use Git;
 
 binmode(STDOUT, ":raw");
diff --git a/git-archimport.perl b/git-archimport.perl
index 947638c38..bc32f18d6 100755
--- a/git-archimport.perl
+++ b/git-archimport.perl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 #
 # This tool is copyright (c) 2005, Martin Langhoff.
 # It is released under the Gnu Public License, version 2.
diff --git a/git-cvsexportcommit.perl b/git-cvsexportcommit.perl
index 9a8188bba..39a426e06 100755
--- a/git-cvsexportcommit.perl
+++ b/git-cvsexportcommit.perl
@@ -1,7 +1,8 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 use 5.008;
 use strict;
+use warnings;
 use Getopt::Std;
 use File::Temp qw(tempdir);
 use Data::Dumper;
diff --git a/git-cvsimport.perl b/git-cvsimport.perl
index 53869fb64..249aeaf17 100755
--- a/git-cvsimport.perl
+++ b/git-cvsimport.perl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 # This tool is copyright (c) 2005, Matthias Urlichs.
 # It is released under the Gnu Public License, version 2.
diff --git a/git-send-email.perl b/git-send-email.perl
index 314e59e7a..d10d86991 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 #
 # Copyright 2002,2005 Greg Kroah-Hartman <greg@kroah.com>
 # Copyright 2005 Ryan Anderson <ryan@michonline.com>