From 6d4ffd8329ce1cd52d93406be25ff77367e23178 Mon Sep 17 00:00:00 2001
From: Stefano Lattarini <stefano.lattarini@gmail.com>
Date: Mon, 27 May 2013 11:14:22 +0200
Subject: [PATCH] suffix rules: better distinction between builtin and
 user-derived

Fixes automake bug#14441.

* lib/Automake/Rule.pm ($_suffix_rules_default): Remove, superseded by ...
(%suffix_rules_builtin): ... this lexical variable.
($suffix_rules): Remove, superseded by ...
(%suffix_rules): ... this lexical variable.
(suffix_rules, suffix_rules_count): Adjust.
(register_suffix_rule): Update '%suffix_rules_builtin' rather than
'%suffix_rules' if the location (as passed by the '$where' argument)
is an "internal" one (doesn't come from user-provided Makefile.am).
(reset): Simplify resetting of '%suffix_rules' to the default ones
accordingly.
* t/list-of-tests.mk (XFAIL_TESTS): Drop test 'suffix-custom-pr14441.sh'.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
---
 lib/Automake/Rule.pm | 31 ++++++++++++-------------------
 t/list-of-tests.mk   |  1 -
 2 files changed, 12 insertions(+), 20 deletions(-)

diff --git a/lib/Automake/Rule.pm b/lib/Automake/Rule.pm
index 5f6f3a239..ed1fa24e6 100644
--- a/lib/Automake/Rule.pm
+++ b/lib/Automake/Rule.pm
@@ -101,10 +101,6 @@ my $_SUFFIX_RULE_PATTERN =
 # Suffixes found during a run.
 use vars '@_suffixes';
 
-# Same as $suffix_rules (declared below), but records only the
-# default rules supplied by the languages Automake supports.
-use vars '$_suffix_rules_default';
-
 =item C<%dependencies>
 
 Holds the dependencies of targets which dependencies are factored.
@@ -154,7 +150,11 @@ C<register_suffix_rule> function.
 
 =cut
 
-my $suffix_rules;
+my %suffix_rules;
+
+# Same as $suffix_rules, but records only the default rules
+# supplied by the languages Automake supports.
+my %suffix_rules_builtin;
 
 =item C<$KNOWN_EXTENSIONS_PATTERN>
 
@@ -317,16 +317,7 @@ sub reset()
 {
   %_rule_dict = ();
   @_suffixes = ();
-  # The first time we initialize the variables,
-  # we save the value of $suffix_rules.
-  if (defined $_suffix_rules_default)
-    {
-      $suffix_rules = $_suffix_rules_default;
-    }
-  else
-    {
-      $_suffix_rules_default = $suffix_rules;
-    }
+  %suffix_rules = %suffix_rules_builtin;
 
   %dependencies =
     (
@@ -393,9 +384,9 @@ XXX
 sub suffix_rule ($$)
 {
   my ($source_ext, $obj) = @_;
-  return undef unless (exists $suffix_rules->{$source_ext} and
-                       exists $suffix_rules->{$source_ext}{$obj});
-  return $suffix_rules->{$source_ext}{$obj}[0];
+  return undef unless (exists $suffix_rules{$source_ext} and
+                       exists $suffix_rules{$source_ext}{$obj});
+  return $suffix_rules{$source_ext}{$obj}[0];
 }
 
 =item C<register_suffix_rule ($where, $src, $dest)>
@@ -410,6 +401,8 @@ This upgrades the C<$suffix_rules> variables.
 sub register_suffix_rule ($$$)
 {
   my ($where, $src, $dest) = @_;
+  my $suffix_rules = $where->{'position'} ? \%suffix_rules
+                                          : \%suffix_rules_builtin;
 
   verb "Sources ending in $src become $dest";
   push @_suffixes, $src, $dest;
@@ -487,7 +480,7 @@ F<Makefile> (excluding predefined suffix rules).
 
 sub suffix_rules_count ()
 {
-  return (scalar keys %$suffix_rules) - (scalar keys %$_suffix_rules_default);
+  return (scalar keys %suffix_rules) - (scalar keys %suffix_rules_builtin);
 }
 
 =item C<@list = suffixes>
diff --git a/t/list-of-tests.mk b/t/list-of-tests.mk
index 8407cf8a1..fb2e44409 100644
--- a/t/list-of-tests.mk
+++ b/t/list-of-tests.mk
@@ -41,7 +41,6 @@ t/remake-timing-bug-pr8365.sh \
 t/lex-subobj-nodep.sh \
 t/remake-am-pr10111.sh \
 t/remake-m4-pr10111.sh \
-t/suffix-custom-pr14441.sh \
 $(perl_fake_XFAIL_TESTS)
 
 perl_TESTS = \
-- 
2.47.2