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From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95807] New: GCC accepts "void value not ignored as it ought
 to be" in function template
Date: Mon, 22 Jun 2020 03:21:01 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: accepts-invalid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: haoxintu at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95807

            Bug ID: 95807
           Summary: GCC accepts "void value not ignored as it ought to be"
                    in function template
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: accepts-invalid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

GCC accepts "void value not ignored as it ought to be" in a function templa=
te
but rejects it in a normal function definition.=20

$cat bug.cc
void foo1() {int var =3D throw;};
template <class>=20
void foo2() {int var =3D throw;};

$g++ -c bug.cc
bug.cc: In function =E2=80=98void foo()=E2=80=99:
bug.cc:1:23: error: void value not ignored as it ought to be
    1 | void foo1() {int var =3D throw;};
      |                       ^~~~~

Noted that GCC only rejects line 1 but accepts line 3.

In clang
$clang++ -c bug.cc
bug.cc:1:18: error: cannot initialize a variable of type 'int' with an rval=
ue
of type 'void'
void foo1() {int var =3D throw;};
                 ^     ~~~~~
bug.cc:3:18: error: cannot initialize a variable of type 'int' with an rval=
ue
of type 'void'
void foo2(){ int var =3D throw;};
                 ^     ~~~~~
2 errors generated.

My GCC version is
$g++ --version
g++ (GCC) 11.0.0 20200605 (experimental)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=