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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109559] New: Unexpected -Wmaybe-uninitialized
 warning when inlining with system header
Date: Wed, 19 Apr 2023 20:23:07 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 14.0
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X-Bugzilla-Who: mpolacek at gcc dot gnu.org
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109559

            Bug ID: 109559
           Summary: Unexpected -Wmaybe-uninitialized warning when inlining
                    with system header
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

The following testcase (the directives simulate a system header) triggers a
-Wmaybe-uninitialized warning:

$ xg++ -c un.cc -Wall -O2
In member function =E2=80=98int function1::swap(function1)=E2=80=99,
    inlined from =E2=80=98int function::operator=3D(Functor) [with Functor =
=3D
FilonIntegral::integrate() const::<lambda()>]=E2=80=99 at :8:56,
    inlined from =E2=80=98double FilonIntegral::integrate() const=E2=80=99 =
at :9:6:
:5:49: warning: =E2=80=98f1=E2=80=99 may be used uninitialized [-Wmaybe-uni=
nitialized]
: In member function =E2=80=98double FilonIntegral::integrate() const=E2=80=
=99:
:1:3: note: by argument 1 of type =E2=80=98const function_base*=E2=80=99 to=
 =E2=80=98int
function_base::has_trivial_copy_and_destroy() const=E2=80=99 declared here
:8:12: note: =E2=80=98f1=E2=80=99 declared here

$ xg++ -c un.cc -Wall -O2 -fno-inline
# nothing

# 0 "" 3
struct function_base {
  has_trivial_copy_and_destroy() const;
  int functor;
};
struct function1 : function_base {
  swap(function1) { has_trivial_copy_and_destroy(); }
};
struct function : function1 {
  template <typename Functor> operator=3D(Functor) { swap(*this); }
};
# 4 ""
struct FilonIntegral {
  double integrate() const;
};
double FilonIntegral::integrate() const {
  function f1;
  f1 =3D [] {};
  return 0;
}=