https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122196
Bug ID: 122196
Summary: template function that starts with __builtin_ causes
an ICE
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: accepts-invalid, ice-checking, ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: pinskia at gcc dot gnu.org
Target Milestone: ---
Yes I know __builtin_f is in the implementation defined namespace but I don't
think we should crash but rather reject this.
testcase:
```
template<typename T> void __builtin_f(T) {}
void valid_uses() {
__builtin_f(1);
__builtin_f('X');
}
```
The ICE:
```
<source>:5:1: error: Two symbols with same comdat_group are not linked by the
same_comdat_group list.
5 | }
| ^
__builtin_f/3 (void __builtin_f(T) [with T = char])
Type: function definition analyzed
Visibility: semantic_interposition no_reorder public weak comdat
comdat_group:__builtin_f one_only
previous sharing asm name: 2
References:
Referring:
Function flags: body
Called by: _Z10valid_usesv/1
Calls:
__builtin_f/2 (void __builtin_f(T) [with T = int])
Type: function definition analyzed
Visibility: semantic_interposition no_reorder public weak comdat
comdat_group:__builtin_f one_only
next sharing asm name: 3
References:
Referring:
Function flags: body
Called by: _Z10valid_usesv/1
Calls:
<source>:5:1: internal compiler error: symtab_node::verify failed
```
Turning off checking we get an assembly failure:
```
/tmp/ccnpHzMa.s: Assembler messages:
/tmp/ccnpHzMa.s:54: Error: symbol `__builtin_f' is already defined
```
Meaning we don't mangle the symbol __builtin_f because it is "builtin".
