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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Improve "use of undeclared identifier x" diagnostic. Where x is a member of the templated base class."
href="https://llvm.org/bugs/show_bug.cgi?id=31048">31048</a>
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<th>Summary</th>
<td>Improve "use of undeclared identifier x" diagnostic. Where x is a member of the templated base class.
</td>
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<th>Product</th>
<td>clang
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>peetlugen19@yandex.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>template<typename T>
struct Base {
int foo();
};
template<typename T>
struct Derived : Base<T> {
void bar();
};
template <typename T>
void Derived<T>::bar() {
foo();
}
Clang (-std=c++1z -fsyntax-only -Wall):
./test20.cpp:13:3: error: use of undeclared identifier 'foo'
foo();
^
1 error generated.
GCC (v6.2.1):
./test20.cpp: In member function ‘void Derived<T>::bar()’:
./test20.cpp:13:7: error: there are no arguments to ‘foo’ that depend on a
template parameter, so a declaration of ‘foo’ must be available [-fpermissive]
foo();
^
Perhaps clang should be able to print some hints that foo can be called through
"this->foo" or by explicitly using the base class scope ("Base<T>::foo()").</pre>
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