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* [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC
@ 2011-06-13 20:20 hstong at ca dot ibm.com
2011-06-22 20:38 ` [Bug c++/49395] " jason at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: hstong at ca dot ibm.com @ 2011-06-13 20:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
Summary: Non-class prvalues seem to have cv-qualification with
GCC
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hstong@ca.ibm.com
CC: michaelw@ca.ibm.com
Host: powerpc64-unknown-linux-gnu
Target: powerpc64-unknown-linux-gnu
C++03 subclause 3.10 [basic.lval] paragraph 9 says that "non-class rvalues
always have cv-unqualified types". When compiling with GCC, some forms of
expressions producing non-class rvalues still act as if they have cv-qualified
type. The test case below is meant to compile clean.
### Self-contained source (a.cpp):
volatile int foo();
struct A { volatile int i; };
typedef volatile int vi;
volatile int i;
const int& ir1 = foo();
const int& ir2 = A().i; // line 8
const int& ir3 = static_cast<volatile int>(i);
const int& ir4 = vi(); // line 10
### Compiler Invocation:
g++-4.6.0 -c a.cpp -o a.o
### Compiler output:
a.cpp:8:22: error: invalid initialization of reference of type 'const int&'
from expression of type 'volatile int'
a.cpp:10:21: error: invalid initialization of reference of type 'const int&'
from expression of type 'vi'
### g++ -v output:
Using built-in specs.
Target: powerpc64-unknown-linux-gnu
Configured with: ./configure --prefix=/data/gcc --program-suffix=-4.6.0
--disable-libssp --disable-libgcj --enable-version-specific-runtime-libs
--with-cpu=default32 --enable-secureplt --with-long-double-128 --enable-shared
--enable-__cxa_atexit --enable-threads=posix --enable-languages=c,c++,fortran
--with-gmp=/usr/local
Thread model: posix
gcc version 4.6.0 (GCC)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
@ 2011-06-22 20:38 ` jason at gcc dot gnu.org
2011-06-23 16:55 ` jason at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2011-06-22 20:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2011.06.22 20:36:09
CC| |jason at gcc dot gnu.org
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
--- Comment #1 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-22 20:36:09 UTC ---
I think line 10 is definitely a bug, line 8 may be a standards issue; I notice
that EDG also complains about that line. Since A().i is a subobject of a class
prvalue, we might want to treat it differently from a normal int prvalue.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
2011-06-22 20:38 ` [Bug c++/49395] " jason at gcc dot gnu.org
@ 2011-06-23 16:55 ` jason at gcc dot gnu.org
2011-06-23 17:10 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2011-06-23 16:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-23 16:52:44 UTC ---
Author: jason
Date: Thu Jun 23 16:52:41 2011
New Revision: 175339
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175339
Log:
PR c++/49395
* init.c (build_zero_init_1): Strip cv-quals from scalar types.
Added:
trunk/gcc/testsuite/g++.dg/init/ref18.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/init.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
2011-06-22 20:38 ` [Bug c++/49395] " jason at gcc dot gnu.org
2011-06-23 16:55 ` jason at gcc dot gnu.org
@ 2011-06-23 17:10 ` jason at gcc dot gnu.org
2012-12-15 4:11 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2011-06-23 17:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2011-06-23 17:09:18 UTC ---
Fixed line 10.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
` (2 preceding siblings ...)
2011-06-23 17:10 ` jason at gcc dot gnu.org
@ 2012-12-15 4:11 ` jason at gcc dot gnu.org
2024-04-04 6:06 ` pinskia at gcc dot gnu.org
2024-04-05 4:54 ` hstong at ca dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-12-15 4:11 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |SUSPENDED
AssignedTo|jason at gcc dot gnu.org |unassigned at gcc dot
| |gnu.org
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
` (3 preceding siblings ...)
2012-12-15 4:11 ` jason at gcc dot gnu.org
@ 2024-04-04 6:06 ` pinskia at gcc dot gnu.org
2024-04-05 4:54 ` hstong at ca dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: pinskia at gcc dot gnu.org @ 2024-04-04 6:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
line 8 is rejected by clang and MSVC also.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/49395] Non-class prvalues seem to have cv-qualification with GCC
2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
` (4 preceding siblings ...)
2024-04-04 6:06 ` pinskia at gcc dot gnu.org
@ 2024-04-05 4:54 ` hstong at ca dot ibm.com
5 siblings, 0 replies; 7+ messages in thread
From: hstong at ca dot ibm.com @ 2024-04-05 4:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49395
Hubert Tong <hstong at ca dot ibm.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|SUSPENDED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Hubert Tong <hstong at ca dot ibm.com> ---
A().i on line 8 is specified to be an xvalue of type "volatile int" nowadays.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2024-04-05 4:54 UTC | newest]
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2011-06-13 20:20 [Bug c++/49395] New: Non-class prvalues seem to have cv-qualification with GCC hstong at ca dot ibm.com
2011-06-22 20:38 ` [Bug c++/49395] " jason at gcc dot gnu.org
2011-06-23 16:55 ` jason at gcc dot gnu.org
2011-06-23 17:10 ` jason at gcc dot gnu.org
2012-12-15 4:11 ` jason at gcc dot gnu.org
2024-04-04 6:06 ` pinskia at gcc dot gnu.org
2024-04-05 4:54 ` hstong at ca dot ibm.com
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