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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang prohibits base class friend member access"
href="https://bugs.llvm.org/show_bug.cgi?id=46036">46036</a>
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<th>Summary</th>
<td>Clang prohibits base class friend member access
</td>
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<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>dragondreamer@live.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Clang (at least trunk, 10.0, 9.0, 8.0, 7.0) rejects to compile the following
code:
// ===================================
#include <iostream>
struct test_base
{
protected:
static constexpr int value = 123;
};
template<typename Base>
struct ignored_friend_declaration
{
static void bug()
{
std::cout << Base::value;
}
};
struct test_child : test_base
{
using ignored_friend_declaration_t = ignored_friend_declaration<test_base>;
friend ignored_friend_declaration_t;
static void test()
{
ignored_friend_declaration_t::bug();
}
};
int main()
{
test_child::test();
}
// ===================================
With the following error: <source>:14:28: error: 'value' is a protected member
of 'test_base'.
G++ and MSVC successfully compile this code.
It seems that Clang ignores the friend declaration of the "test_child" class,
which is inherited from "test_base".</pre>
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</p>
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