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* [Bug c++/65062] New: [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable
@ 2015-02-14 2:44 thiago at kde dot org
2015-02-14 2:49 ` [Bug c++/65062] " pinskia at gcc dot gnu.org
2015-02-14 2:54 ` thiago at kde dot org
0 siblings, 2 replies; 3+ messages in thread
From: thiago at kde dot org @ 2015-02-14 2:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65062
Bug ID: 65062
Summary: [4.9 Regression] Miscompilation: invalid C++ mangled
name for global variable
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: thiago at kde dot org
Code:
template <class>
void tf()
{
extern void (*qt_memfill32)();
qt_memfill32();
}
void f() {
tf<int>();
}
When compiled with GCC 5.0, the object file has a reference to
"_Z12qt_memfill32", which doesn't seem to me to be a valid C++ mangled name. At
the very least, it's an ABI compatibility break with previous versions of GCC,
other compilers and with itself.
This symbol is defined in another .o as "qt_memfill32", even when compiled with
GCC 5.0.
Tests:
gcc-5.0 -O2 -S -o - test.cpp:
jmp *_Z12qt_memfill32(%rip)
gcc-4.9 -O2 -S -o - test.cpp:
movq qt_memfill32(%rip), %rax
jmp *%rax
clang-3.6 -O2 -S -o - test.cpp:
jmpq *qt_memfill32(%rip) # TAILCALL
icpc -O2 -S -o - test.cpp:
movq qt_memfill32(%rip), %rax
jmp *%rax
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/65062] [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable
2015-02-14 2:44 [Bug c++/65062] New: [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable thiago at kde dot org
@ 2015-02-14 2:49 ` pinskia at gcc dot gnu.org
2015-02-14 2:54 ` thiago at kde dot org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2015-02-14 2:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65062
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
it was just fixed yesterday, see bug 64898. Please check the latest GCC before
filing a bug especially during stage 4.
*** This bug has been marked as a duplicate of bug 64898 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/65062] [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable
2015-02-14 2:44 [Bug c++/65062] New: [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable thiago at kde dot org
2015-02-14 2:49 ` [Bug c++/65062] " pinskia at gcc dot gnu.org
@ 2015-02-14 2:54 ` thiago at kde dot org
1 sibling, 0 replies; 3+ messages in thread
From: thiago at kde dot org @ 2015-02-14 2:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65062
--- Comment #2 from Thiago Macieira <thiago at kde dot org> ---
(In reply to Andrew Pinski from comment #1)
> it was just fixed yesterday, see bug 64898. Please check the latest GCC
> before filing a bug especially during stage 4.
>
> *** This bug has been marked as a duplicate of bug 64898 ***
Sorry, I did rebuild two days ago when this started showing up. I must have
missed the fix by a few hours, more or less (again).
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-02-14 2:54 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2015-02-14 2:44 [Bug c++/65062] New: [4.9 Regression] Miscompilation: invalid C++ mangled name for global variable thiago at kde dot org
2015-02-14 2:49 ` [Bug c++/65062] " pinskia at gcc dot gnu.org
2015-02-14 2:54 ` thiago at kde dot org
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