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From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/103629] [11/12/13 Regression] wrong-code when mixing
 mutex with visibility=hidden
Date: Wed, 24 Aug 2022 12:28:40 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 11.2.0
X-Bugzilla-Keywords: wrong-code
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Message-ID: <bug-103629-4-Gz2tmlXBSa@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103629

--- Comment #25 from Mathieu Malaterre <malat at debian dot org> ---
Looks like there is an easy fix (work-around?):

% cat Tree.h
#pragma once

#include <memory>
#include <mutex>

class
#ifdef VIS
__attribute__((visibility("default")))
#endif
Tree {
public:
  static const std::string treeType() {
    static std::once_flag once;
    std::call_once(once, []() {
      std::printf("%p\n", &sTreeTypeName);
      sTreeTypeName.reset(new std::string());
    });
    std::printf("%p\n", &sTreeTypeName);
    if (!sTreeTypeName)
      throw "uhoh";
    return *sTreeTypeName;
  }

private:
  static std::unique_ptr<const std::string> sTreeTypeName;
};

std::unique_ptr<const std::string> Tree::sTreeTypeName;=