From 6ec9efeca46af8ccad8021f3fbd9ab7f1721da05 Mon Sep 17 00:00:00 2001
From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Thu, 1 Nov 2001 13:59:42 +0000
Subject: [PATCH] If an encoding is set by -M/-m, it must be in effect only for
 the actual script, not any other required/-M/-m'ed module, otherwise we enter
 a nasty recursion in regexec.c while trying to init the simple UTF-8
 charclasses like PL_utf8_alnum.

p4raw-id: //depot/perl@12799
---
 lib/encoding.pm     | 14 ++++----------
 pod/perlunicode.pod |  3 +--
 pp_ctl.c            | 14 +++++++++++++-
 3 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/lib/encoding.pm b/lib/encoding.pm
index 33c5113..fd9d19b 100644
--- a/lib/encoding.pm
+++ b/lib/encoding.pm
@@ -61,19 +61,13 @@ If no encoding is specified, the environment variable L<PERL_ENCODING>
 is consulted.  If that fails, "latin1" (ISO 8859-1) is assumed.
 If no encoding can be found, C<Unknown encoding '...'> error will be thrown.
 
-=head1 FUTURE POSSIBILITIES
+=head1 KNOWN PROBLEMS
 
 The C<\x..> and C<\0...> in regular expressions are not affected by
-this pragma.  They probably should.
-
-The charnames "\N{...}" does not work with this pragma.
-
-=head1 KNOWN PROBLEMS
+this pragma.  They very probably should.
 
-Cannot be combined with C<use utf8>.  Note that this is a problem
-B<only> if you would like to have Unicode identifiers in your scripts.
-You should not need C<use utf8> for anything else these days
-(since Perl 5.8.0).
+The charnames pragma ("\N{LATIN SMALL SHARP LETTER S}") does not work
+with this pragma.
 
 =head1 SEE ALSO
 
diff --git a/pod/perlunicode.pod b/pod/perlunicode.pod
index a5a69ff..106a4bf 100644
--- a/pod/perlunicode.pod
+++ b/pod/perlunicode.pod
@@ -53,8 +53,7 @@ B<NOTE: this should be the only place where an explicit C<use utf8> is
 needed>.
 
 You can also use the C<encoding> pragma to change the default encoding
-of the data in your script; see L<encoding>.   Currently this cannot
-be combined with C<use utf8>.
+of the data in your script; see L<encoding>.
 
 =back
 
diff --git a/pp_ctl.c b/pp_ctl.c
index 567370b..9e73ca2 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -3036,6 +3036,8 @@ PP(pp_require)
     SV *filter_state = 0;
     SV *filter_sub = 0;
     SV *hook_sv = 0;
+    SV *encoding;
+    OP *op;
 
     sv = POPs;
     if (SvNIOKp(sv)) {
@@ -3379,7 +3381,17 @@ trylocal: {
     PL_eval_owner = thr;
     MUTEX_UNLOCK(&PL_eval_mutex);
 #endif /* USE_5005THREADS */
-    return DOCATCH(doeval(gimme, NULL));
+
+    /* Store and reset encoding. */
+    encoding = PL_encoding;
+    PL_encoding = Nullsv;
+
+    op = DOCATCH(doeval(gimme, NULL));
+    
+    /* Restore encoding. */
+    PL_encoding = encoding;
+
+    return op;
 }
 
 PP(pp_dofile)
-- 
2.7.4