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From: "physhivam at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107175] New: overloaded resolution has a bug incase of
 deleted functions
Date: Thu, 06 Oct 2022 20:05:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107175

            Bug ID: 107175
           Summary: overloaded resolution has a bug incase of deleted
                    functions
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: physhivam at gmail dot com
  Target Milestone: ---

Hey, I was trying to build clang's libcxx on my ubuntu 22.04 and it has
gcc-11.2 by default most prolly, but while building libcxx there was an err=
or
about using the deleted function but it seems that overloaded resolution in
gcc-11 has a bug

namespace N {
  struct S {};
  void func(S);
}

namespace ADL {
  void func() =3D delete;
}

template <class T>
void call_func(T t) {
  using ADL::func;
  func(t);
}

int main() {
  call_func(N::S{});
}

error:=20
<source>: In instantiation of 'void call_func(T) [with T =3D N::S]':
<source>:18:12:   required from here
<source>:14:7: error: use of deleted function 'void ADL::func()'
   14 |   func(t);
      |   ~~~~^~~
<source>:8:8: note: declared here
    8 |   void func() =3D delete;
      |        ^~~~
Compiler returned: 1

 https://godbolt.org/z/GPTPYaobb , it consider wrong overloaded function ,
although the bug is fixed in the most recent version but I guess this needs=
 to
be backport in the previous version where gcc starts support for c++11, as =
many
of the previous versions are the default versions on several machines.=