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* [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
@ 2015-01-20 19:16 vhaisman at gmail dot com
2015-01-20 19:18 ` [Bug c++/64697] " vhaisman at gmail dot com
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: vhaisman at gmail dot com @ 2015-01-20 19:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
Bug ID: 64697
Summary: C++11 thread_local: relocation truncated to fit:
R_X86_64_PC32 against undefined symbol `TLS init
function for N::ptd'
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vhaisman at gmail dot com
I have hit an issue with thread-local storage variables on
Cygwin/AMD64, I do not see it with Cygwin/i686.
I am having linking issues when using `thread_local` keyword in Cygwin
with its GCC 4.8.3 and GCC 4.9.2. This is derived from log4cplus. The
test case is split into three files:
File def.hxx:
~~~~
#include <string>
namespace N
{
struct S { std::string str; };
// extern declaration in a header
extern thread_local S * ptd;
// accessing the extern declared ptd here
inline
S * get_ptd ()
{
if (! ptd)
ptd = new S;
return ptd;
}
} // namespace N
~~~~
File def.cxx:
~~~~
#include "def.hxx"
namespace N
{
// definition of ptd
thread_local S * ptd = nullptr;
} // namespace N
~~~
File use.cxx:
~~~~
#include "def.hxx"
namespace N
{
__declspec(dllexport)
void * foo ()
{
// invoking inline get_ptd() function to get the value in ptd
return get_ptd ();
}
}
~~~~
Now, when I compile each .cxx with `g++ -std=gnu++11
-fvisibility=hidden -c use.cxx def.cxx` and then try to link with `g++
-shared -o cygtest.dll use.o def.o`, I get the following error from
linker:
~~~~
use.o:use.cxx:(.text$_ZTWN1N3ptdE[_ZTWN1N3ptdE]+0x15): relocation
truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init
function for N::ptd'
collect2: error: ld returned 1 exit status
~~~~
The nm -C ./def.o output confirms that:
~~~~
`--> nm -C ./def.o
0000000000000000 b .bss
0000000000000000 d .data
0000000000000000 r .rdata
0000000000000000 r .rdata$zzz
0000000000000000 t .text
0000000000000008 r __emutls_t._ZN1N3ptdE
0000000000000000 D __emutls_v._ZN1N3ptdE
0000000000000000 r std::piecewise_construct
~~~~
As you can see, the ptd thread-local variable initialization function
is not defined anywhere. The use.o references this initialization
function (see bottom of the listing):
~~~~
`--> nm -C ./use.o
0000000000000000 b .bss
0000000000000000 d .data
0000000000000000 i .drectve
0000000000000000 p .pdata
0000000000000000 p .pdata$_ZN1N1SC1Ev
0000000000000000 p .pdata$_ZN1N7get_ptdEv
0000000000000000 p .pdata$_ZTWN1N3ptdE
0000000000000000 r .rdata
0000000000000000 r .rdata$.refptr.__emutls_v._ZN1N3ptdE
0000000000000000 r .rdata$.refptr._ZTHN1N3ptdE
0000000000000000 r .rdata$zzz
0000000000000000 R .refptr.__emutls_v._ZN1N3ptdE
0000000000000000 R .refptr._ZTHN1N3ptdE
0000000000000000 t .text
0000000000000000 t .text$_ZN1N1SC1Ev
0000000000000000 t .text$_ZN1N7get_ptdEv
0000000000000000 t .text$_ZTWN1N3ptdE
0000000000000000 A .weak._ZTHN1N3ptdE._ZN1N1SC1Ev
0000000000000000 r .xdata
0000000000000000 r .xdata$_ZN1N1SC1Ev
0000000000000000 r .xdata$_ZN1N7get_ptdEv
0000000000000000 r .xdata$_ZTWN1N3ptdE
U __emutls_get_address
U __emutls_v._ZN1N3ptdE
U __gxx_personality_seh0
U __real__ZdlPv
U __real__Znwm
U _Unwind_Resume
U operator delete(void*)
0000000000000000 T N::S::S()
0000000000000000 T N::foo()
0000000000000000 T N::get_ptd()
U std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string()
U operator new(unsigned long)
0000000000000000 r std::piecewise_construct
w TLS init function for N::ptd
0000000000000000 T TLS wrapper function for N::ptd
~~~~
Now, this code seems to work well on Linux with both GCC and Clang.
Is this a GCC problem on Cygwin?
Am I using extern thread_local wrong?
My experiments show that not using the extern keyword seems to fix the
issue. But I am not sure if that does not introduce two ptd
thread-local variables in two TUs.
See also http://stackoverflow.com/q/28023728/341065
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
@ 2015-01-20 19:18 ` vhaisman at gmail dot com
2020-03-26 22:03 ` wilson at gcc dot gnu.org
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: vhaisman at gmail dot com @ 2015-01-20 19:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #2 from Václav Zeman <vhaisman at gmail dot com> ---
Created attachment 34504
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34504&action=edit
def.cxx
>From gcc-bugs-return-474104-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 19:18:10 2015
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From: "vhaisman at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
Date: Tue, 20 Jan 2015 19:18:00 -0000
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--- Comment #1 from Václav Zeman <vhaisman at gmail dot com> ---
Created attachment 34503
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34503&action=edit
def.hxx
>From gcc-bugs-return-474106-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 19:19:11 2015
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From: "vhaisman at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
Date: Tue, 20 Jan 2015 19:19:00 -0000
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--- Comment #3 from Václav Zeman <vhaisman at gmail dot com> ---
Created attachment 34505
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34505&action=edit
use.cxx
>From gcc-bugs-return-474107-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 19:21:25 2015
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From: "jiwang at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/64669] [5 Regression] aarch64-linux profiledbootstrap failure
Date: Tue, 20 Jan 2015 19:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd669
--- Comment #10 from Jiong Wang <jiwang at gcc dot gnu.org> ---
(In reply to Richard Henderson from comment #8)
> Indeed, if I force used_in_cond_stmt_p to return false, which forces
> the use of the emit_cstore path, which means we return a proper
> boolean value instead of a CCmode value, the test case doesn't ICE.
>
> Moreover, combine does in fact remove the redundant compare and we
> are left with
>
> cmp w0, 39
> ccmp w0, 10, 4, ne
> bne .L19
>
> I think I was wrong to approve the ccmp patch with the used_in_cond_stmt_p
> logic in the first place, and that it should all be removed.
Richard, will you send out the patch? I could help testing
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
2015-01-20 19:18 ` [Bug c++/64697] " vhaisman at gmail dot com
@ 2020-03-26 22:03 ` wilson at gcc dot gnu.org
2020-03-26 23:02 ` vhaisman at gmail dot com
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: wilson at gcc dot gnu.org @ 2020-03-26 22:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
Jim Wilson <wilson at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wilson at gcc dot gnu.org
--- Comment #22 from Jim Wilson <wilson at gcc dot gnu.org> ---
This looks like a binutils bug to me. A call to an undefined weak function
should never be executed, so it is OK for the linker to convert that call
instruction into anything convenient. There is no need for a relocation that
can reach an address of zero. We can convert the call instruction to call
itself, or the next instruction, or change it to a nop, what ever is
convenient, it doesn't really matter.
A number of binutils ports already have code to handle related problems. ARM
and RISC-V for sure. Probably others. It looks like this support is missing
from the x86_64 port. I'd suggest refiling this as a binutils bug. See for
instance
https://sourceware.org/bugzilla/show_bug.cgi?id=23244
for a RISC-V example of the same problem. But we need a new bug for the x86_64
problem. RISC-V has a register hard wired to zero, so I rewrite the call
instruction to use x0 as the base address. The arm port turns the call into a
nop.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
2015-01-20 19:18 ` [Bug c++/64697] " vhaisman at gmail dot com
2020-03-26 22:03 ` wilson at gcc dot gnu.org
@ 2020-03-26 23:02 ` vhaisman at gmail dot com
2020-03-26 23:06 ` wilson at gcc dot gnu.org
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: vhaisman at gmail dot com @ 2020-03-26 23:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #23 from Václav Haisman <vhaisman at gmail dot com> ---
I am not sure what to report. I do not understand the background of linker and
relocations enough. Also, I don't have access to Windows and Cygwin any more.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (2 preceding siblings ...)
2020-03-26 23:02 ` vhaisman at gmail dot com
@ 2020-03-26 23:06 ` wilson at gcc dot gnu.org
2021-10-01 8:56 ` cvs-commit at gcc dot gnu.org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: wilson at gcc dot gnu.org @ 2020-03-26 23:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #24 from Jim Wilson <wilson at gcc dot gnu.org> ---
Joel Sherrill offered to create a binutils bug report for this.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (3 preceding siblings ...)
2020-03-26 23:06 ` wilson at gcc dot gnu.org
@ 2021-10-01 8:56 ` cvs-commit at gcc dot gnu.org
2021-10-01 8:59 ` cvs-commit at gcc dot gnu.org
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-10-01 8:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #25 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Eric Botcazou <ebotcazou@gcc.gnu.org>:
https://gcc.gnu.org/g:021ad8e5cf9ab66e1a0a41dce3a54586facb86e0
commit r12-4036-g021ad8e5cf9ab66e1a0a41dce3a54586facb86e0
Author: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri Oct 1 10:49:34 2021 +0200
Fix PR c++/64697 at -O1 or above
The BFD fix eliminates the link failure and working code is generated at
-O0, but _not_ when optimization is enabled because the optimizer changes:
movq .refptr._ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
into:
leaq _ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
and the leaq now also gets the relocation overflow. So the fix is to
teach legitimate_pic_address_disp_p to reject the transformation when
the symbol is an external weak function, which yields:
cmpq $0, .refptr._ZTH1s(%rip)
je .L2
call _ZTH1s
and the cmpq keeps a relocation that does not overflow.
gcc/
PR c++/64697
* config/i386/i386.c (legitimate_pic_address_disp_p): For PE-COFF
do
not return true for external weak function symbols in medium model.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (4 preceding siblings ...)
2021-10-01 8:56 ` cvs-commit at gcc dot gnu.org
@ 2021-10-01 8:59 ` cvs-commit at gcc dot gnu.org
2021-10-01 9:02 ` cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-10-01 8:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #26 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Eric Botcazou
<ebotcazou@gcc.gnu.org>:
https://gcc.gnu.org/g:618b7cb3b3fb4d2d92434d31ea8b6746ffef2572
commit r11-9049-g618b7cb3b3fb4d2d92434d31ea8b6746ffef2572
Author: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri Oct 1 10:49:34 2021 +0200
Fix PR c++/64697 at -O1 or above
The BFD fix eliminates the link failure and working code is generated at
-O0, but _not_ when optimization is enabled because the optimizer changes:
movq .refptr._ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
into:
leaq _ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
and the leaq now also gets the relocation overflow. So the fix is to
teach legitimate_pic_address_disp_p to reject the transformation when
the symbol is an external weak function, which yields:
cmpq $0, .refptr._ZTH1s(%rip)
je .L2
call _ZTH1s
and the cmpq keeps a relocation that does not overflow.
gcc/
PR c++/64697
* config/i386/i386.c (legitimate_pic_address_disp_p): For PE-COFF
do
not return true for external weak function symbols in medium model.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (5 preceding siblings ...)
2021-10-01 8:59 ` cvs-commit at gcc dot gnu.org
@ 2021-10-01 9:02 ` cvs-commit at gcc dot gnu.org
2021-10-01 9:05 ` ebotcazou at gcc dot gnu.org
2022-10-14 10:31 ` ebotcazou at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-10-01 9:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
--- Comment #27 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Eric Botcazou
<ebotcazou@gcc.gnu.org>:
https://gcc.gnu.org/g:48e24ff39b16c072cd58bdad1a5668794453af5f
commit r10-10158-g48e24ff39b16c072cd58bdad1a5668794453af5f
Author: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri Oct 1 10:49:34 2021 +0200
Fix PR c++/64697 at -O1 or above
The BFD fix eliminates the link failure and working code is generated at
-O0, but _not_ when optimization is enabled because the optimizer changes:
movq .refptr._ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
into:
leaq _ZTH1s(%rip), %rax
testq %rax, %rax
je .L2
call _ZTH1s
and the leaq now also gets the relocation overflow. So the fix is to
teach legitimate_pic_address_disp_p to reject the transformation when
the symbol is an external weak function, which yields:
cmpq $0, .refptr._ZTH1s(%rip)
je .L2
call _ZTH1s
and the cmpq keeps a relocation that does not overflow.
gcc/
PR c++/64697
* config/i386/i386.c (legitimate_pic_address_disp_p): For PE-COFF
do
not return true for external weak function symbols in medium model.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (6 preceding siblings ...)
2021-10-01 9:02 ` cvs-commit at gcc dot gnu.org
@ 2021-10-01 9:05 ` ebotcazou at gcc dot gnu.org
2022-10-14 10:31 ` ebotcazou at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2021-10-01 9:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
Target Milestone|--- |10.4
CC| |ebotcazou at gcc dot gnu.org
--- Comment #28 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
The binutils bug has been fixed in 2.36 or later:
https://sourceware.org/bugzilla/show_bug.cgi?id=26659
The optimization bug will be fixed in upcoming 10.x, 11.x and 12.x releases.
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug c++/64697] C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
` (7 preceding siblings ...)
2021-10-01 9:05 ` ebotcazou at gcc dot gnu.org
@ 2022-10-14 10:31 ` ebotcazou at gcc dot gnu.org
8 siblings, 0 replies; 10+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2022-10-14 10:31 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64697
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alvinhochun at gmail dot com
--- Comment #29 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
*** Bug 104862 has been marked as a duplicate of this bug. ***
^ permalink raw reply [flat|nested] 10+ messages in thread
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2015-01-20 19:16 [Bug c++/64697] New: C++11 thread_local: relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd' vhaisman at gmail dot com
2015-01-20 19:18 ` [Bug c++/64697] " vhaisman at gmail dot com
2020-03-26 22:03 ` wilson at gcc dot gnu.org
2020-03-26 23:02 ` vhaisman at gmail dot com
2020-03-26 23:06 ` wilson at gcc dot gnu.org
2021-10-01 8:56 ` cvs-commit at gcc dot gnu.org
2021-10-01 8:59 ` cvs-commit at gcc dot gnu.org
2021-10-01 9:02 ` cvs-commit at gcc dot gnu.org
2021-10-01 9:05 ` ebotcazou at gcc dot gnu.org
2022-10-14 10:31 ` ebotcazou at gcc dot gnu.org
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