Fix perl searchpath for modern perl for MSVC tools

Modern versions of perl no longer include the current directory in the
perl searchpath, as it's insecure. Instead of adding the current
directory, we get around the problem by adding the directory where the
script lives.

Problem noted by Victor Wagner.

Solution adapted from buildfarm client code.

Backpatch to all live versions.

3 files changed, 10 insertions, 0 deletions

diff --git a/src/tools/msvc/install.pl b/src/tools/msvc/install.pl
index bde5b7c793a..d7b7c7ee615 100755
--- a/src/tools/msvc/install.pl
+++ b/src/tools/msvc/install.pl
@@ -6,6 +6,10 @@
 use strict;
 use warnings;
 
+use File::Basename;
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
+
 use Install qw(Install);
 
 # buildenv.pl is for specifying the build environment settings
diff --git a/src/tools/msvc/mkvcbuild.pl b/src/tools/msvc/mkvcbuild.pl
index 6f1c42e5044..748b0eb4156 100644
--- a/src/tools/msvc/mkvcbuild.pl
+++ b/src/tools/msvc/mkvcbuild.pl
@@ -7,6 +7,10 @@
 use strict;
 use warnings;
 
+use File::Basename;
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
+
 use Mkvcbuild;
 
 chdir('..\..\..') if (-d '..\msvc' && -d '..\..\..\src');
diff --git a/src/tools/msvc/vcregress.pl b/src/tools/msvc/vcregress.pl
index 64428ac7c39..3462144731f 100644
--- a/src/tools/msvc/vcregress.pl
+++ b/src/tools/msvc/vcregress.pl
@@ -10,6 +10,8 @@ use Cwd;
 use File::Basename;
 use File::Copy;
 use File::Find ();
+use File::Spec;
+BEGIN  { use lib File::Spec->rel2abs(dirname(__FILE__)); }
 
 use Install qw(Install);