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* [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates
@ 2012-05-25 14:09 omawarisan.bokudesu at live dot jp
2012-05-25 15:07 ` [Bug c++/53484] [4.7/4.8 Regression] " redi at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: omawarisan.bokudesu at live dot jp @ 2012-05-25 14:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
Bug #: 53484
Summary: [c++11] Wrong auto in lambdas in function templates
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: omawarisan.bokudesu@live.jp
In the following program, auto is deduced to be int&, while int is expected.
template <class T>
void f(T x){
[&]{
std::cout << x << std::endl;
auto y = x;
y = 100;
std::cout << x << std::endl;
}();
}
int main(){ f(0); }
output:
0
100
In non-template functions, it doesn't occur.
------------
revision r187865
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/user/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/home/user/gcc-trunk
--disable-bootstrap --disable-multilib --enable-languages=c,c++,fortran
--with-gmp=/home/user/gcc-trunk/src/build/backends
--with-mpfr=/home/user/gcc-trunk/src/build/backends
--with-mpc=/home/user/gcc-trunk/src/build/backends
Thread model: posix
gcc version 4.8.0 20120525 (experimental) (GCC)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
@ 2012-05-25 15:07 ` redi at gcc dot gnu.org
2012-05-29 14:32 ` rguenth at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: redi at gcc dot gnu.org @ 2012-05-25 15:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |4.6.3
Keywords| |rejects-valid, wrong-code
Last reconfirmed| |2012-05-25
CC| |jason at gcc dot gnu.org
Ever Confirmed|0 |1
Summary|[c++11] Wrong auto in |[4.7/4.8 Regression]
|lambdas in function |[c++11] Wrong auto in
|templates |lambdas in function
| |templates
Known to fail| |4.7.0, 4.8.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-05-25 14:49:55 UTC ---
Regression against 4.6.3
Possibly related, the example in [expr.prim.lambda]/18 fails to compile with
4.7 and 4.8
void f3() {
float x, &r = x;
[=] { // x and r are not captured (appearance in a decltype operand is not
an odr-use)
decltype(x) y1; // y1 has type float
decltype((x)) y2 = y1; // y2 has type float const& because this lambda
// is not mutable and x is an lvalue
decltype(r) r1 = y1; // r1 has type float& (transformation not
considered)
decltype((r)) r2 = y2; // r2 has type float const&
};
}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
2012-05-25 15:07 ` [Bug c++/53484] [4.7/4.8 Regression] " redi at gcc dot gnu.org
@ 2012-05-29 14:32 ` rguenth at gcc dot gnu.org
2012-05-31 15:55 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-05-29 14:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|--- |4.7.1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
2012-05-25 15:07 ` [Bug c++/53484] [4.7/4.8 Regression] " redi at gcc dot gnu.org
2012-05-29 14:32 ` rguenth at gcc dot gnu.org
@ 2012-05-31 15:55 ` jason at gcc dot gnu.org
2012-06-01 16:55 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-05-31 15:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
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] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
` (2 preceding siblings ...)
2012-05-31 15:55 ` jason at gcc dot gnu.org
@ 2012-06-01 16:55 ` jason at gcc dot gnu.org
2012-06-01 18:43 ` jason at gcc dot gnu.org
2012-06-01 18:45 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-06-01 16:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2012-06-01 16:55:15 UTC ---
Author: jason
Date: Fri Jun 1 16:55:08 2012
New Revision: 188116
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188116
Log:
PR c++/53484
* pt.c (do_auto_deduction): Don't try to deduce from a
type-dependent initializer.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/auto33.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/pt.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
` (3 preceding siblings ...)
2012-06-01 16:55 ` jason at gcc dot gnu.org
@ 2012-06-01 18:43 ` jason at gcc dot gnu.org
2012-06-01 18:45 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-06-01 18:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
--- Comment #3 from Jason Merrill <jason at gcc dot gnu.org> 2012-06-01 18:43:30 UTC ---
Author: jason
Date: Fri Jun 1 18:43:23 2012
New Revision: 188122
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188122
Log:
PR c++/53484
* pt.c (do_auto_deduction): Don't try to deduce from a
type-dependent initializer.
Added:
branches/gcc-4_7-branch/gcc/testsuite/g++.dg/cpp0x/auto33.C
Modified:
branches/gcc-4_7-branch/gcc/cp/ChangeLog
branches/gcc-4_7-branch/gcc/cp/pt.c
branches/gcc-4_7-branch/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug c++/53484] [4.7/4.8 Regression] [c++11] Wrong auto in lambdas in function templates
2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
` (4 preceding siblings ...)
2012-06-01 18:43 ` jason at gcc dot gnu.org
@ 2012-06-01 18:45 ` jason at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: jason at gcc dot gnu.org @ 2012-06-01 18:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53484
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2012-06-01 18:44:57 UTC ---
Fixed for 4.7.1.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2012-05-25 14:09 [Bug c++/53484] New: [c++11] Wrong auto in lambdas in function templates omawarisan.bokudesu at live dot jp
2012-05-25 15:07 ` [Bug c++/53484] [4.7/4.8 Regression] " redi at gcc dot gnu.org
2012-05-29 14:32 ` rguenth at gcc dot gnu.org
2012-05-31 15:55 ` jason at gcc dot gnu.org
2012-06-01 16:55 ` jason at gcc dot gnu.org
2012-06-01 18:43 ` jason at gcc dot gnu.org
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