qt 6.5.1 original

config.tests/no_direct_extern_access/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(direct_extern_access LANGUAGES CXX)
+
+# this is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+# and https://sourceware.org/bugzilla/show_bug.cgi?id=29377
+
+add_library(no_extern_access_lib SHARED lib.cpp)
+add_executable(no_extern_access_main other.cpp main.cpp)
+
+target_compile_options(no_extern_access_lib PRIVATE "-Werror")
+target_compile_options(no_extern_access_lib PUBLIC "$<$<CXX_COMPILER_ID:GNU>:-mno-direct-extern-access>")
+target_compile_options(no_extern_access_lib PUBLIC "$<$<CXX_COMPILER_ID:Clang>:-fno-direct-access-external-data>")
+
+target_link_libraries(no_extern_access_main no_extern_access_lib)

config.tests/no_direct_extern_access/lib.cpp

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+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: MIT
+
+// This is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+
+#define BUILD
+#include "lib.h"
+
+void *S::ptr = nullptr;
+S::~S() { }
+void *S::f() { return ptr; }

config.tests/no_direct_extern_access/lib.h

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+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: MIT
+
+// This is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+
+#ifdef BUILD
+#  define LIB_API __attribute__((visibility("protected")))
+#else
+#  define LIB_API __attribute__((visibility("default")))
+#endif
+
+struct LIB_API S
+{
+    virtual ~S();
+    virtual void *f();
+    static void *ptr;
+};

config.tests/no_direct_extern_access/main.cpp

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+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: MIT
+
+// This is combining the tests found in:
+// https://sourceware.org/bugzilla/show_bug.cgi?id=29087
+// https://sourceware.org/bugzilla/show_bug.cgi?id=29377
+
+#include "lib.h"
+
+extern void foo(); // other.cpp
+void (*get_foo())()
+{
+    return foo;
+}
+
+struct Local : S { };
+int main()
+{
+    Local l;
+}

config.tests/no_direct_extern_access/other.cpp

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+// Copyright (C) 2022 Intel Corporation.
+// SPDX-License-Identifier: MIT
+
+// This is the test found in https://sourceware.org/bugzilla/show_bug.cgi?id=29377
+
+__attribute__((visibility("protected"))) void foo()
+{
+}