https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103937
Bug ID: 103937
Summary: Assembler error: symbol is already defined when
compiling static member function templates
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mac.zyg2 at protonmail dot com
Target Milestone: ---
Created attachment 52139
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52139&action=edit
Full error message for GCC 11.2
This code doesn't compile with "symbol ... is already defined":
```
class SortAlgorithm {
public:
template<typename T>
static void test(T* t, bool(*compare_func)() =
[]() -> bool { return true; }) {
test(t);
}
};
int main() {
int arr[] { 1, 2 };
SortAlgorithm::test(arr);
}
```
The names that are included in the error demangles to this:
```
>>> demangle('_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_clEv')
'SortAlgorithm::test<int>(int*, bool (*)())::{default
arg#1}::{lambda()#1}::operator()() const'
>>> demangle('_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NUlvE_4_FUNEv')
'SortAlgorithm::test<int>(int*, bool (*)())::{default
arg#1}::{lambda()#1}::_FUN()'
>>> demangle('_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_cvS4_Ev')
'SortAlgorithm::test<int>(int*, bool (*)())::{default
arg#1}::{lambda()#1}::operator bool (*)()() const'
```
This code throws internal compiler error on trunk:
```
<source>:13:1: error: Two symbols with same comdat_group are not linked by the
same_comdat_group list.
13 | }
| ^
_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_cvS4_Ev/6 (constexpr
SortAlgorithm::<lambda()>::operator bool (*)()() const) @0x7f86cadb8880
Type: function definition analyzed
Visibility: semantic_interposition no_reorder public weak comdat
comdat_group:_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_cvS4_Ev one_only
artificial
previous sharing asm name: 2
References: _ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NUlvE_4_FUNEv/5 (addr)
__gxx_personality_v0/8 (addr)
Referring:
Function flags: body
Called by: _ZN13SortAlgorithm4testIiEEvPT_PFbvE/7
Calls:
_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_cvS4_Ev/2 (constexpr
SortAlgorithm::<lambda()>::operator bool (*)()() const) @0x7f86cadb8440
Type: function definition analyzed
Visibility: semantic_interposition no_reorder public weak comdat
comdat_group:_ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NKUlvE_cvS4_Ev one_only
artificial
next sharing asm name: 6
References: _ZZN13SortAlgorithm4testIiEEvPT_PFbvEEd_NUlvE_4_FUNEv/1 (addr)
__gxx_personality_v0/8 (addr)
Referring:
Function flags: body
Called by: main/3
Calls:
<source>:13:1: internal compiler error: symtab_node::verify failed
0x213d2c9 internal_error(char const*, ...)
???:0
0xbd4532 symtab_node::verify_symtab_nodes()
???:0
0xbf0a6f symbol_table::finalize_compilation_unit()
???:0
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.
Compiler returned: 1
```
Demo: https://godbolt.org/z/G796Wxehb
