perl: Reproducible build fixes

Applies two patches that are required to improve the reproducibility of
builds.

(From OE-Core rev: 9297cabb0aca8212d3cc74f8d26e43abc02ded87)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/perl/files/0001-enc2xs-Add-environment-variable-to-suppress-comments.patch

@@ -0,0 +1,30 @@
+From 31a2c5555f9ef32f35d7d5ce1fd09a010ba5f5c6 Mon Sep 17 00:00:00 2001
+From: Joshua Watt <JPEWhacker@gmail.com>
+Date: Mon, 17 Jun 2019 10:47:15 -0500
+Subject: [PATCH 1/2] enc2xs: Add environment variable to suppress comments
+
+Comment generation in enc2xs can now be suppressed by setting the
+ENC2XS_NO_COMMENTS environment variable. This allows enc2xs to produce
+reproducible output by omitting the name of the generating program.
+
+Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
+Upstream-status: Accepted [https://github.com/dankogai/p5-encode/pull/145]
+---
+ cpan/Encode/bin/enc2xs | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/cpan/Encode/bin/enc2xs b/cpan/Encode/bin/enc2xs
+index 619b64b757..bfce9ee735 100644
+--- a/cpan/Encode/bin/enc2xs
++++ b/cpan/Encode/bin/enc2xs
+@@ -144,6 +144,7 @@ getopts('CM:SQqOo:f:n:v',\%opt);
+ $opt{M} and make_makefile_pl($opt{M}, @ARGV);
+ $opt{C} and make_configlocal_pm($opt{C}, @ARGV);
+ $opt{v} ||= $ENV{ENC2XS_VERBOSE};
++$opt{q} ||= $ENV{ENC2XS_NO_COMMENTS};
+ 
+ sub verbose {
+     print STDERR @_ if $opt{v};
+-- 
+2.21.0
+

meta/recipes-devtools/perl/files/0002-Constant-Fix-up-shebang.patch

@@ -0,0 +1,32 @@
+From 260ebd15e16cd86b9b58e5c5f3a496b3853ca46d Mon Sep 17 00:00:00 2001
+From: Joshua Watt <JPEWhacker@gmail.com>
+Date: Mon, 17 Jun 2019 10:47:23 -0500
+Subject: [PATCH 2/2] Constant: Fix up shebang
+
+The instructions indicate that the script should be explicitly passed to
+"perl -x", so automatically setting the #! to be ^X is unnecessary and
+makes the file non-reproducible when building because ^X could be the
+absolute path to miniperl.
+
+Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
+Upstream-status: Submitted [https://rt.cpan.org/Public/Bug/Display.html?id=129866]
+---
+ cpan/ExtUtils-Constant/lib/ExtUtils/Constant/XS.pm | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/cpan/ExtUtils-Constant/lib/ExtUtils/Constant/XS.pm b/cpan/ExtUtils-Constant/lib/ExtUtils/Constant/XS.pm
+index 14eb809714..d4d074e121 100644
+--- a/cpan/ExtUtils-Constant/lib/ExtUtils/Constant/XS.pm
++++ b/cpan/ExtUtils-Constant/lib/ExtUtils/Constant/XS.pm
+@@ -219,7 +219,7 @@ sub dogfood {
+      Regenerate these constant functions by feeding this entire source file to
+      perl -x
+ 
+-#!$^X -w
++#!/usr/bin/env perl -x -w
+ use ExtUtils::Constant qw (constant_types C_constant XS_constant);
+ 
+ EOT
+-- 
+2.21.0
+

meta/recipes-devtools/perl/perl_5.30.0.bb

@@ -19,6 +19,8 @@ SRC_URI = "https://www.cpan.org/src/5.0/perl-${PV}.tar.gz;name=perl \
            file://perl-dynloader.patch \
            file://0001-configure_path.sh-do-not-hardcode-prefix-lib-as-libr.patch \
            file://fix-setgroup.patch \
+           file://0001-enc2xs-Add-environment-variable-to-suppress-comments.patch \
+           file://0002-Constant-Fix-up-shebang.patch \
            "
 SRC_URI_append_class-native = " \
            file://perl-configpm-switch.patch \
@@ -37,6 +39,9 @@ DEPENDS += "db gdbm zlib virtual/crypt"
 
 PERL_LIB_VER = "${@'.'.join(d.getVar('PV').split('.')[0:2])}.0"
 
+# Don't generate comments in enc2xs output files. They are not reproducible
+export ENC2XS_NO_COMMENTS = "1"
+
 do_unpack_append() {
     bb.build.exec_func('do_copy_perlcross', d)
 }