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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unexpected error "definition with same mangled name as another definition""
href="https://bugs.llvm.org/show_bug.cgi?id=33924">33924</a>
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<th>Summary</th>
<td>Unexpected error "definition with same mangled name as another definition"
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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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>Modules
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>pank.dm@gmail.com
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</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=18843" name="attach_18843" title="Files that reproduce the error">attachment 18843</a> <a href="attachment.cgi?id=18843&action=edit" title="Files that reproduce the error">[details]</a></span>
Files that reproduce the error
It triggers on the following piece of code when we try to instantiate templated
function `format` in 2 separate modules:
// -- format.h
class Formatter {
public:
template <class T>
void doFormat(T& out) {}
};
template <class T>
void format(T t) {
Formatter f;
auto lambda = [] {};
f.doFormat(lambda);
}
(see full set of files in attachment)
Error message:
In module 'foo1' imported from main.cpp:1:
In module 'format' imported from ./foo1.h:3:
./format.h:6:8: error: definition with same mangled name as another
definition
void doFormat(T& out) {}
^
./format.h:6:8: note: previous definition is here
Seems like this is related to passing lambda from templated function. If I try
to call `doFormat` on regular class or move body of `format` into module `foo`
itself, then the error goes away.
Worth noting there is also assertion triggering when using clang built from
source in debug mode:
llvm/lib/IR/Value.cpp:402: void llvm::Value::doRAUW(llvm::Value*, bool):
Assertion `New->getType() == getType(
) && "replaceAllUses of value with new value of different type!"' failed.
Repro command line:
clang++ --std=c++14 -I . -fmodules -fcxx-modules
-fmodules-cache-path=./modules_out/_module_cache -c main.cpp -o main.o
A non-modular compilation that uses the same set of files finishes fine.
Let me know if you need any extra information.</pre>
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