https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122550
Bug ID: 122550
Summary: template friend function is ambiguous with g++ 14
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fujii.hironori at gmail dot com
Target Milestone: ---
Created attachment 62705
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62705&action=edit
repro
g++ 13 and clang can compile.
g++ 14 and 15 can't compile.
$ g++ -std=c++23 -c a.cpp
a.cpp: In function ‘void add(Hasher&, UnsignedInteger)’:
a.cpp:21:8: error: call of overloaded ‘add(Hasher&, uint32_t)’ is ambiguous
[-Wtemplate-body]
21 | add(hasher, static_cast<uint32_t>(integer));
| ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cpp:21:8: note: there are 3 candidates
a.cpp:8:6: note: candidate 1: ‘void add(Hasher&, UnsignedInteger) [with
UnsignedInteger = unsigned int]’
8 | void add(Hasher&, UnsignedInteger);
| ^~~
a.cpp:13:17: note: candidate 2: ‘void add(Hasher&, UnsignedInteger) [with
UnsignedInteger = unsigned int]’
13 | friend void add(Hasher& hasher, UnsignedInteger integer) {
| ^~~
https://godbolt.org/z/4aW41Phbh
