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From: "k.frolov at samsung dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/111708] Calling external global function instead of local
 static function.
Date: Fri, 06 Oct 2023 11:56:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111708

--- Comment #3 from Kirill Frolov <k.frolov at samsung dot com> ---
Looks like example demonstrates undefined behaviour. This article=20
(https://wiki.sei.cmu.edu/confluence/display/c/DCL36-C.+Do+not+declare+an+i=
dentifier+with+conflicting+linkage+classifications)
contains table, which shows that I can use "extern" keyword in second
declaration to refer symbol with internal linkage. So I fixed the
source:

static int f(int);

int main(int argc, const char *argv[])
{
    (void)argv;
    return f(argc);
}

static int f(int f)
{
    int x =3D f;
    {
        extern int f(int);

        if (x < 1)
            return 0;
        else
            return f(x - 1);
    }
}

The problem still persist.  See an example: https://godbolt.org/z/reGbM67Kj
GCC still references external function "f", but I expect that internal func=
tion
must be referenced instead.=