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* [Bug c++/96975] New: gcc cannot compile at -O0 but compiles at -O1/-O2/-O3
@ 2020-09-08 11:27 tangyixuan at mail dot dlut.edu.cn
2020-09-08 13:05 ` [Bug c++/96975] " rguenth at gcc dot gnu.org
2020-09-11 13:08 ` mpolacek at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: tangyixuan at mail dot dlut.edu.cn @ 2020-09-08 11:27 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96975
Bug ID: 96975
Summary: gcc cannot compile at -O0 but compiles at -O1/-O2/-O3
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tangyixuan at mail dot dlut.edu.cn
Target Milestone: ---
Hi, the following code is not compiled with -O0, but is compiled with
-O1/O2/O3.
$ cat s.cpp
typedef void (* A )();
template < A T > struct S { S (){}};
void T (){} S < T > a ;
int main (){
void T ();
S < T > a ;
}
$ g++ -c -O0 s.cpp
/tmp/cc1wgC6C.s:73: Error: symbol
`_ZN14CXXRecordDeclAIXadL_Z13FunctionDeclAvEEEC2Ev' is already defined
$ g++ -c -O2 s.cpp
success.
$ clang++ -c -O0 s.cpp
success.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c++/96975] gcc cannot compile at -O0 but compiles at -O1/-O2/-O3
2020-09-08 11:27 [Bug c++/96975] New: gcc cannot compile at -O0 but compiles at -O1/-O2/-O3 tangyixuan at mail dot dlut.edu.cn
@ 2020-09-08 13:05 ` rguenth at gcc dot gnu.org
2020-09-11 13:08 ` mpolacek at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-09-08 13:05 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96975
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Status|UNCONFIRMED |NEW
Keywords| |ice-checking, link-failure
Known to fail| |11.0
Last reconfirmed| |2020-09-08
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
It also ICEs on trunk. I think I've seen this ICE before so there might be a
duplicate.
> ./cc1plus -quiet t.ii -O0
t.ii:7:1: error: Two symbols with same comdat_group are not linked by the
same_comdat_group list.
7 | }
| ^
_ZN1SIXadL_Z1TvEEEC1Ev/8 (S<T>::S() [with void (* T)() = T]) @0x7f30a353e9d8
Type: function definition analyzed alias cpp_implicit_alias
Visibility: public weak comdat comdat_group:_ZN1SIXadL_Z1TvEEEC5Ev one_only
Same comdat group as: _ZN1SIXadL_Z1TvEEEC2Ev/7
previous sharing asm name: 5
References: _ZN1SIXadL_Z1TvEEEC2Ev/7 (alias)
Referring:
Function flags:
Called by: main/2
Calls:
_ZN1SIXadL_Z1TvEEEC1Ev/5 (S<T>::S() [with void (* T)() = T]) @0x7f30a353e5a0
Type: function definition analyzed alias cpp_implicit_alias
Visibility: public weak comdat comdat_group:_ZN1SIXadL_Z1TvEEEC5Ev one_only
Same comdat group as: _ZN1SIXadL_Z1TvEEEC2Ev/4
next sharing asm name: 8
References: _ZN1SIXadL_Z1TvEEEC2Ev/4 (alias)
Referring:
Function flags:
Called by: _Z41__static_initialization_and_destruction_0ii/9
Calls:
t.ii:7:1: internal compiler error: symtab_node::verify failed
0xf55569 symtab_node::verify_symtab_nodes()
/home/rguenther/src/gcc2/gcc/symtab.c:1368
0xf7f07c symtab_node::checking_verify_symtab_nodes()
/home/rguenther/src/gcc2/gcc/cgraph.h:667
0xf7cec7 symbol_table::compile()
/home/rguenther/src/gcc2/gcc/cgraphunit.c:2755
0xf7d4ae symbol_table::finalize_compilation_unit()
/home/rguenther/src/gcc2/gcc/cgraphunit.c:3017
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
^ permalink raw reply [flat|nested] 3+ messages in thread* [Bug c++/96975] gcc cannot compile at -O0 but compiles at -O1/-O2/-O3
2020-09-08 11:27 [Bug c++/96975] New: gcc cannot compile at -O0 but compiles at -O1/-O2/-O3 tangyixuan at mail dot dlut.edu.cn
2020-09-08 13:05 ` [Bug c++/96975] " rguenth at gcc dot gnu.org
@ 2020-09-11 13:08 ` mpolacek at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2020-09-11 13:08 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96975
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
CC| |mpolacek at gcc dot gnu.org
Status|NEW |RESOLVED
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> It also ICEs on trunk. I think I've seen this ICE before so there might be
> a duplicate.
Yup. It would be really great if this could be fixed.
*** This bug has been marked as a duplicate of bug 91241 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-09-11 13:08 UTC | newest]
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2020-09-08 11:27 [Bug c++/96975] New: gcc cannot compile at -O0 but compiles at -O1/-O2/-O3 tangyixuan at mail dot dlut.edu.cn
2020-09-08 13:05 ` [Bug c++/96975] " rguenth at gcc dot gnu.org
2020-09-11 13:08 ` mpolacek at gcc dot gnu.org
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