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From: "rs2740 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/111050] [11/12/13/14 Regression] ABI break in
 _Hash_node_value_base since GCC 11
Date: Wed, 06 Sep 2023 18:15:30 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ABI
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X-Bugzilla-Who: rs2740 at gmail dot com
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Message-ID: <bug-111050-4-2KvmqhGLzt@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111050

--- Comment #5 from TC <rs2740 at gmail dot com> ---
Minimal example:

$ cat lib1.cpp
#include <unordered_set>
#include <string>

static std::unordered_set<std::string> set;

void del(const std::string& s) {
    set.erase(s);
}

$ cat lib2.cpp
#include <unordered_set>
#include <string>

static std::unordered_set<std::string> set;

void add(const std::string& s) {
    set.emplace(s);
}

const std::string& get(const std::string& s) {
    return *set.find(s);
}

$ cat main.cpp

#include <string>

void add(const std::string&);
void del(const std::string&);
const std::string& get(const std::string&);

int main() {
    add("foo");
    del("bar");
    (void) get("foo").size();
}

$ g++-10 -std=3Dc++17 lib1.cpp -c -o lib1.o
$ g++-13 -std=3Dc++17 lib2.cpp -c -o lib2.o
$ g++-13 -std=3Dc++17 main.cpp lib1.o lib2.o -o test
$ ./test
Segmentation fault (core dumped)=