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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Assertion failure/wrong linkage for explicit specialisation of function templates, declared in an unnamed namespace"
href="https://bugs.llvm.org/show_bug.cgi?id=42321">42321</a>
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<th>Summary</th>
<td>Assertion failure/wrong linkage for explicit specialisation of function templates, declared in an unnamed namespace
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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
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>momchil.velikov@arm.com
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<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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<pre>Testcase (<a href="https://gcc.godbolt.org/z/E85jsh">https://gcc.godbolt.org/z/E85jsh</a>):
inline namespace {
template <typename T> int f() { return 0; }
template <typename T> int g() { return 0; }
}
template<> int f<int>() { return 0; }
template int g<int>();
int (*pf)() = f<int>;
int (*pg)() = g<int>;
triggers assertion failure in debug builds:
$ ./bin/clang -S bb.cc -o -
clang-9: /data/src/llvm-project/clang/lib/AST/Decl.cpp:1491: clang::LinkageInfo
clang::LinkageComputer::getLVForDecl(const clang::NamedDecl *,
clang::LVComputationKind): Assertion `!Old || Old->getCachedLinkage() ==
D->getCachedLinkage()' failed.
In release builds, the function `f<int>` has external linkage and filescope,
whereas `g<int>` has internal linkage and is in the unnamed namespace.
IIUC [temp.explicit] #6 and [temp.expl.spec] #8 both should be members of the
unnamed namespace and, following, [basic.link] #4, have internal linkage.</pre>
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