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* [Bug c++/49598] New: Ice on lambda with implicit capture by value.
@ 2011-06-30 20:31 3dw4rd at verizon dot net
2011-06-30 20:44 ` [Bug c++/49598] " 3dw4rd at verizon dot net
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: 3dw4rd at verizon dot net @ 2011-06-30 20:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
Summary: Ice on lambda with implicit capture by value.
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: 3dw4rd@verizon.net
I have a brand new (r175707) 4.7 build on x86_64 GNU/Linux.
I saw an error with lambdas on stackoverflow:
-----------------------------------------------
#include <iostream>
using std::cout;
using std::endl;
int
main()
{
int i = 10;
int& ir = i;
[=] // [i, ir] explicit capture works.
{
cout << "value capture" << endl
<< "i: " << i << endl
<< "ir: " << ir << endl
<< "&i: " << &i << endl
<< "&ir: " << &ir << endl
<< endl;
}();
}
-----------------------------------------------
This is reduced somewhat.
I get:
-----------------------------------------------
[ed@localhost ~]$ ./bin/bin/g++ -std=c++0x -o lamb2 lamb2.cpp
lamb2.cpp: In function ‘int main()’:
lamb2.cpp:10:1: error: non-trivial conversion at assignment
int
int &
D.28407.__ir = ir;
lamb2.cpp:10:1: internal compiler error: verify_gimple failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
-----------------------------------------------
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
@ 2011-06-30 20:44 ` 3dw4rd at verizon dot net
2011-07-02 0:53 ` [Bug c++/49598] [C++0x] " 3dw4rd at verizon dot net
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: 3dw4rd at verizon dot net @ 2011-06-30 20:44 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
--- Comment #1 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2011-06-30 20:43:39 UTC ---
Reduced testcase:
-----------------------------------------
int
main()
{
int i = 10;
int& ir = i;
[=] // [i, ir] explicit capture works.
{
i == ir;
}();
}
-----------------------------------------
With [=, ir] I get a warning:
lamb3.cpp:10:7: warning: explicit by-copy capture of ‘ir’ redundant with
by-copy capture default [enabled by default]
But it compiles.
With [=, i] I get the ICE.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
2011-06-30 20:44 ` [Bug c++/49598] " 3dw4rd at verizon dot net
@ 2011-07-02 0:53 ` 3dw4rd at verizon dot net
2011-07-02 11:26 ` redi at gcc dot gnu.org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: 3dw4rd at verizon dot net @ 2011-07-02 0:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
--- Comment #2 from Ed Smith-Rowland <3dw4rd at verizon dot net> 2011-07-02 00:52:57 UTC ---
This compiled on gcc-4.5 but the answer is junk.
ed@bad-horse:~$ g++ -std=c++0x -o lamb2 lamb2.cpp
ed@bad-horse:~$ ./lamb2
value capture
i: 10
ir: 617467132
&i: 0x7fff24cdcce0
&ir: 0x7fff24cdcce4
Compiler version of compile but junk answer:
ed@bad-horse:~$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.5 --enable-shared --enable-multiarch
--with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu
--without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/x86_64-linux-gnu
--enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default
--with-plugin-ld=ld.gold --enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
2011-06-30 20:44 ` [Bug c++/49598] " 3dw4rd at verizon dot net
2011-07-02 0:53 ` [Bug c++/49598] [C++0x] " 3dw4rd at verizon dot net
@ 2011-07-02 11:26 ` redi at gcc dot gnu.org
2011-07-05 5:14 ` jason at gcc dot gnu.org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: redi at gcc dot gnu.org @ 2011-07-02 11:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.07.02 11:25:48
CC| |jason at gcc dot gnu.org
Ever Confirmed|0 |1
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-07-02 11:25:48 UTC ---
The ICE seems to be when initialising the closure type's data member for an
object of reference type implicitly-captured by copy.
Slightly further reduced:
int
main()
{
int i = 10;
int& ir = i;
[=]
{
(void) ir;
}();
}
(In reply to comment #1)
> With [=, ir] I get a warning:
> lamb3.cpp:10:7: warning: explicit by-copy capture of ‘ir’ redundant with
> by-copy capture default [enabled by default]
> But it compiles.
>
> With [=, i] I get the ICE.
That's invalid:
"If a lambda-capture includes a capture-default that is =, the lambda-capture
shall not contain this and each identifier it contains shall be preceded by &."
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
` (2 preceding siblings ...)
2011-07-02 11:26 ` redi at gcc dot gnu.org
@ 2011-07-05 5:14 ` jason at gcc dot gnu.org
2011-07-05 14:48 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jason at gcc dot gnu.org @ 2011-07-05 5:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
` (3 preceding siblings ...)
2011-07-05 5:14 ` jason at gcc dot gnu.org
@ 2011-07-05 14:48 ` jason at gcc dot gnu.org
2011-07-05 14:52 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jason at gcc dot gnu.org @ 2011-07-05 14:48 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-07-05 14:47:26 UTC ---
Author: jason
Date: Tue Jul 5 14:47:21 2011
New Revision: 175857
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175857
Log:
PR c++/49598
* semantics.c (finish_id_expression): convert_from_reference.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ref2.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
` (4 preceding siblings ...)
2011-07-05 14:48 ` jason at gcc dot gnu.org
@ 2011-07-05 14:52 ` jason at gcc dot gnu.org
2011-07-05 20:02 ` jason at gcc dot gnu.org
2011-07-16 17:30 ` iorate_stage at yahoo dot co.jp
7 siblings, 0 replies; 9+ messages in thread
From: jason at gcc dot gnu.org @ 2011-07-05 14:52 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2011-07-05 14:51:59 UTC ---
Author: jason
Date: Tue Jul 5 14:51:56 2011
New Revision: 175863
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=175863
Log:
PR c++/49598
* semantics.c (finish_id_expression): convert_from_reference.
Added:
branches/gcc-4_6-branch/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-ref2.C
Modified:
branches/gcc-4_6-branch/gcc/cp/ChangeLog
branches/gcc-4_6-branch/gcc/cp/semantics.c
branches/gcc-4_6-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
` (5 preceding siblings ...)
2011-07-05 14:52 ` jason at gcc dot gnu.org
@ 2011-07-05 20:02 ` jason at gcc dot gnu.org
2011-07-16 17:30 ` iorate_stage at yahoo dot co.jp
7 siblings, 0 replies; 9+ messages in thread
From: jason at gcc dot gnu.org @ 2011-07-05 20:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |4.6.2
--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> 2011-07-05 20:01:34 UTC ---
Fixed (output as well as crash) for 4.6.2.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug c++/49598] [C++0x] Ice on lambda with implicit capture by value.
2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
` (6 preceding siblings ...)
2011-07-05 20:02 ` jason at gcc dot gnu.org
@ 2011-07-16 17:30 ` iorate_stage at yahoo dot co.jp
7 siblings, 0 replies; 9+ messages in thread
From: iorate_stage at yahoo dot co.jp @ 2011-07-16 17:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49598
iorate <iorate_stage at yahoo dot co.jp> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |iorate_stage at yahoo dot
| |co.jp
--- Comment #7 from iorate <iorate_stage at yahoo dot co.jp> 2011-07-16 17:29:41 UTC ---
*** Bug 49763 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 9+ messages in thread
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2011-06-30 20:31 [Bug c++/49598] New: Ice on lambda with implicit capture by value 3dw4rd at verizon dot net
2011-06-30 20:44 ` [Bug c++/49598] " 3dw4rd at verizon dot net
2011-07-02 0:53 ` [Bug c++/49598] [C++0x] " 3dw4rd at verizon dot net
2011-07-02 11:26 ` redi at gcc dot gnu.org
2011-07-05 5:14 ` jason at gcc dot gnu.org
2011-07-05 14:48 ` jason at gcc dot gnu.org
2011-07-05 14:52 ` jason at gcc dot gnu.org
2011-07-05 20:02 ` jason at gcc dot gnu.org
2011-07-16 17:30 ` iorate_stage at yahoo dot co.jp
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