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* [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static
@ 2012-08-15 21:23 travis at gockelhut dot com
2012-08-16 6:21 ` [Bug c++/54276] " daniel.kruegler at googlemail dot com
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: travis at gockelhut dot com @ 2012-08-15 21:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Bug #: 54276
Summary: Lambda in a Template Function Undefined Reference to
local static
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: travis@gockelhut.com
Created attachment 28021
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28021
Compile
The following code will fail to link with "undefined reference to `x'" when
compiled with g++ (4.6.1, 4.6.2, 4.6.3 and 4.7.0):
template <typename T>
void foo(T)
{
static int x = 1;
auto f = [] { return x + 1; };
f();
}
---
/tmp/cc236Klq.o: In function `void
foo<int>(int)::{lambda()#1}::operator()() const':
unmangled-ref.cpp:(.text+0x20): undefined reference to `x'
collect2: error: ld returned 1 exit status
---
It *appears* we attempt to load x from the unmangled version:
movl _ZL1x(%rip), %eax
In g++ 4.6.3, you can work around this issue by explicitly capturing the static
variable:
auto f = [&x] { return x + 1; };
So x is loaded from the fully-mangled name:
movq $_ZZ3fooIiEvT_E1x, -16(%rbp)
---
$> g++ -v
Using built-in specs.
COLLECT_GCC=g++-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.0-7ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --disable-bootstrap --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-gnu-unique-object --enable-plugin --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 4.7.0 (Ubuntu/Linaro 4.7.0-7ubuntu3)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
@ 2012-08-16 6:21 ` daniel.kruegler at googlemail dot com
2012-08-19 12:10 ` paolo.carlini at oracle dot com
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2012-08-16 6:21 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |daniel.kruegler at
| |googlemail dot com
--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-08-16 06:20:47 UTC ---
The problem seems to be fixed in gcc 4.8.0 20120729 (experimental)
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
2012-08-16 6:21 ` [Bug c++/54276] " daniel.kruegler at googlemail dot com
@ 2012-08-19 12:10 ` paolo.carlini at oracle dot com
2012-08-19 12:15 ` daniel.kruegler at googlemail dot com
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-08-19 12:10 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|travis at gockelhut dot com |
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-08-19 12:09:54 UTC ---
Daniel can you please double check this one too? Today I'm definitely seeing
the undefined reference.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
2012-08-16 6:21 ` [Bug c++/54276] " daniel.kruegler at googlemail dot com
2012-08-19 12:10 ` paolo.carlini at oracle dot com
@ 2012-08-19 12:15 ` daniel.kruegler at googlemail dot com
2012-08-19 12:45 ` paolo.carlini at oracle dot com
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: daniel.kruegler at googlemail dot com @ 2012-08-19 12:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
--- Comment #3 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2012-08-19 12:14:53 UTC ---
(In reply to comment #2)
> Daniel can you please double check this one too? Today I'm definitely seeing
> the undefined reference.
It seems that I need to fix my gcc installation as described in bug 54319 - my
apologies.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (2 preceding siblings ...)
2012-08-19 12:15 ` daniel.kruegler at googlemail dot com
@ 2012-08-19 12:45 ` paolo.carlini at oracle dot com
2013-02-15 15:18 ` paolo.carlini at oracle dot com
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-08-19 12:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-08-19
Ever Confirmed|0 |1
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (3 preceding siblings ...)
2012-08-19 12:45 ` paolo.carlini at oracle dot com
@ 2013-02-15 15:18 ` paolo.carlini at oracle dot com
2013-02-15 19:22 ` jason at gcc dot gnu.org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-02-15 15:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jason at gcc dot gnu.org
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-15 15:17:24 UTC ---
Just noticed that *the workaround* doesn't work anymore in 4.8/4.7, not sure if
this implies something interesting...
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (4 preceding siblings ...)
2013-02-15 15:18 ` paolo.carlini at oracle dot com
@ 2013-02-15 19:22 ` jason at gcc dot gnu.org
2013-02-15 19:23 ` jason at gcc dot gnu.org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2013-02-15 19:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
--- Comment #5 from Jason Merrill <jason at gcc dot gnu.org> 2013-02-15 19:22:23 UTC ---
Author: jason
Date: Fri Feb 15 19:22:14 2013
New Revision: 196091
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196091
Log:
PR c++/54276
* semantics.c (finish_id_expression): Also return the identifier
for an outer local static.
Added:
trunk/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-template9.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (5 preceding siblings ...)
2013-02-15 19:22 ` jason at gcc dot gnu.org
@ 2013-02-15 19:23 ` jason at gcc dot gnu.org
2013-02-16 2:08 ` jason at gcc dot gnu.org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2013-02-15 19:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
AssignedTo|unassigned at gcc dot |jason at gcc dot gnu.org
|gnu.org |
Target Milestone|--- |4.8.0
--- Comment #6 from Jason Merrill <jason at gcc dot gnu.org> 2013-02-15 19:23:32 UTC ---
Fixed for 4.8.
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (6 preceding siblings ...)
2013-02-15 19:23 ` jason at gcc dot gnu.org
@ 2013-02-16 2:08 ` jason at gcc dot gnu.org
2013-02-16 3:31 ` jason at gcc dot gnu.org
2013-02-16 9:24 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2013-02-16 2:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
--- Comment #7 from Jason Merrill <jason at gcc dot gnu.org> 2013-02-16 02:08:00 UTC ---
Author: jason
Date: Sat Feb 16 02:07:55 2013
New Revision: 196101
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=196101
Log:
PR c++/54276
* semantics.c (finish_id_expression): Also return the identifier
for an outer local static.
Added:
branches/gcc-4_7-branch/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-template9.C
Modified:
branches/gcc-4_7-branch/gcc/cp/ChangeLog
branches/gcc-4_7-branch/gcc/cp/semantics.c
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (7 preceding siblings ...)
2013-02-16 2:08 ` jason at gcc dot gnu.org
@ 2013-02-16 3:31 ` jason at gcc dot gnu.org
2013-02-16 9:24 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: jason at gcc dot gnu.org @ 2013-02-16 3:31 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
Jason Merrill <jason at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.8.0 |4.7.3
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c++/54276] Lambda in a Template Function Undefined Reference to local static
2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
` (8 preceding siblings ...)
2013-02-16 3:31 ` jason at gcc dot gnu.org
@ 2013-02-16 9:24 ` paolo.carlini at oracle dot com
9 siblings, 0 replies; 11+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-02-16 9:24 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54276
--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-02-16 09:24:11 UTC ---
... and 4.7.3 too.
^ permalink raw reply [flat|nested] 11+ messages in thread
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2012-08-15 21:23 [Bug c++/54276] New: Lambda in a Template Function Undefined Reference to local static travis at gockelhut dot com
2012-08-16 6:21 ` [Bug c++/54276] " daniel.kruegler at googlemail dot com
2012-08-19 12:10 ` paolo.carlini at oracle dot com
2012-08-19 12:15 ` daniel.kruegler at googlemail dot com
2012-08-19 12:45 ` paolo.carlini at oracle dot com
2013-02-15 15:18 ` paolo.carlini at oracle dot com
2013-02-15 19:22 ` jason at gcc dot gnu.org
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