From: Jonathan Wakely <jwakely.gcc@gmail.com>
To: gcc-patches <gcc-patches@gcc.gnu.org>
Subject: Re: PING: [patch] fix c++/33558 - references cannot be mutable
Date: Sat, 01 Jan 2011 22:34:00 -0000 [thread overview]
Message-ID: <AANLkTin3k66y69aiwKtjH_sriNyvyi36pjqpprNDPaTs@mail.gmail.com> (raw)
In-Reply-To: <AANLkTimcmQb0GaiwH3VsTWTHvp5iFEnHgV4V9SOm2DtM@mail.gmail.com>
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On 22 December 2010 14:53, Jonathan Wakely wrote:
> This is a very small patch to fix a standard conformance issue.
>
> I've made it a permerror so broken code can use -fpermissive and
> doesn't need to be fixed.
>
> I'd really like to get this in 4.6, so pinging for review
... again
> On 18 December 2010 18:57, Jonathan Wakely wrote:
>> This is a slightly modified version of the patch attached to PR33558
>> which was posted to gcc-patches but apparently never reviewed. I
>> don't know if the author of the original patch, Giovanni, has a
>> copyright assignment but I think the change is obvious and I hope is
>> sufficiently small to not need an assignment. I was in the process of
>> making the same change when I found his patch on the PR and copied the
>> wording of his diagnostic and testcase.
>>
>> Sun CC and g++ both incorrectly accept mutable references, so it might
>> not be uncommon in the wild (I found a use in some production code
>> yesterday.) This version of the patch allows mutable on reference
>> members when -fpermissive is used, giving old code a transition path.
>> I'll add a note to changes.html if this is approved.
>>
>> tested x86_64-linux, OK for trunk?
>>
>>
>> cp/ChangeLog entry:
>>
>> 2010-12-18 Giovanni Funchal <gafunchal@gmail.com>
>> Jonathan Wakely <jwakely.gcc@gmail.com>
>>
>> PR c++/33558
>> * decl.c (grokdeclarator): Reject mutable reference members.
>>
>> testsuite/ChangeLog entry:
>>
>> 2010-12-18 Giovanni Funchal <gafunchal@gmail.com>
>> Jonathan Wakely <jwakely.gcc@gmail.com>
>>
>> PR c++/33558
>> * testsuite/g++.dg/other/pr33558.C: New.
>> * testsuite/g++.dg/other/pr33558-2.C: New.
>>
>
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Index: cp/decl.c
===================================================================
--- cp/decl.c (revision 167817)
+++ cp/decl.c (working copy)
@@ -9210,6 +9210,12 @@ grokdeclarator (const cp_declarator *dec
error ("const %qs cannot be declared %<mutable%>", name);
storage_class = sc_none;
}
+ else if (TREE_CODE (type) == REFERENCE_TYPE)
+ {
+ permerror (input_location, "reference %qs cannot be declared "
+ "%<mutable%>", name);
+ storage_class = sc_none;
+ }
}
/* If this is declaring a typedef name, return a TYPE_DECL. */
Index: testsuite/g++.dg/other/pr33558.C
===================================================================
--- testsuite/g++.dg/other/pr33558.C (revision 0)
+++ testsuite/g++.dg/other/pr33558.C (revision 0)
@@ -0,0 +1,5 @@
+/* { dg-do compile } */
+
+class X {
+ mutable int &q; /* { dg-error "cannot be declared 'mutable'" } */
+};
Index: testsuite/g++.dg/other/pr33558-2.C
===================================================================
--- testsuite/g++.dg/other/pr33558-2.C (revision 0)
+++ testsuite/g++.dg/other/pr33558-2.C (revision 0)
@@ -0,0 +1,6 @@
+/* { dg-do compile } */
+/* { dg-options "-fpermissive" } */
+
+class X {
+ mutable int &q; /* { dg-warning "cannot be declared 'mutable'" } */
+};
next prev parent reply other threads:[~2011-01-01 22:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-22 15:16 Jonathan Wakely
2010-12-22 15:24 ` Jonathan Wakely
2011-01-01 22:34 ` Jonathan Wakely [this message]
2011-01-13 22:03 ` Jonathan Wakely
2011-01-14 2:04 ` Jason Merrill
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