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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/108231] malloc and cleanup attributes vs extern "C" in a
 namespace and global and using of one in the namespace in the global one and
 the builtin free
Date: Tue, 27 Dec 2022 08:11:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108231

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|malloc attribute vs extern  |malloc and cleanup
                   |"C" in a namespace and      |attributes vs extern "C" in
                   |global and using of one in  |a namespace and global and
                   |the namespace in the global |using of one in the
                   |one and the builtin free    |namespace in the global one
                   |                            |and the builtin free

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Here is another example of the same issue but with cleanup attribute instea=
d:
```
namespace std {
extern "C" int printf (const char*, ...);
}
using std::printf;
extern "C" int printf (const char*, ...);
void foo (const char *) { printf ("%s\n", __PRETTY_FUNCTION__); }

void bar () {
    const char a __attribute__ ((cleanup (printf))) =3D 0;
    printf ("%s calling ", __PRETTY_FUNCTION__);
    foo (&a);
    printf ("cleanup calling ");
}

int main ()
{
    bar ();
}
```

Note if you order swap the order of declarations of printf it works.
Same with free in the original testcase for malloc.=