automake: import upstream fix for perl 5.26

patches/openwrt/0121-automake-import-upstream-fix-for-perl-5.26.patch

@@ -0,0 +1,46 @@
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Wed, 7 Jun 2017 19:39:33 +0200
+Subject: automake: import upstream fix for perl 5.26
+
+Build broke as distributions now include Perl 5.26 and automake
+triggered an "Unescaped left brace in regex" error.
+Import upstream commit 13f00eb449 to fix that.
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+
+diff --git a/tools/automake/patches/010-automake-port-to-Perl-5.22-and-later.patch b/tools/automake/patches/010-automake-port-to-Perl-5.22-and-later.patch
+new file mode 100644
+index 0000000000000000000000000000000000000000..31b9273d547145e5ecbeaef20a1e82cc9292fdc2
+--- /dev/null
++++ b/tools/automake/patches/010-automake-port-to-Perl-5.22-and-later.patch
+@@ -0,0 +1,30 @@
++From 13f00eb4493c217269b76614759e452d8302955e Mon Sep 17 00:00:00 2001
++From: Paul Eggert <eggert@cs.ucla.edu>
++Date: Thu, 31 Mar 2016 16:35:29 -0700
++Subject: [PATCH] automake: port to Perl 5.22 and later
++
++Without this change, Perl 5.22 complains "Unescaped left brace in
++regex is deprecated" and this is planned to become a hard error in
++Perl 5.26.  See:
++http://search.cpan.org/dist/perl-5.22.0/pod/perldelta.pod#A_literal_%22{%22_should_now_be_escaped_in_a_pattern
++* bin/automake.in (substitute_ac_subst_variables): Escape left brace.
++---
++ bin/automake.in | 2 +-
++ 1 file changed, 1 insertion(+), 1 deletion(-)
++
++diff --git a/bin/automake.in b/bin/automake.in
++index a3a0aa318..2c8f31e14 100644
++--- a/bin/automake.in
+++++ b/bin/automake.in
++@@ -3878,7 +3878,7 @@ sub substitute_ac_subst_variables_worker
++ sub substitute_ac_subst_variables
++ {
++   my ($text) = @_;
++-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+++  $text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
++   return $text;
++ }
++ 
++-- 
++2.13.1
++