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<base href="https://bugs.llvm.org/">
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - c++2a mode failures compiling LLVM Verifier.h - == overloads !=?"
href="https://bugs.llvm.org/show_bug.cgi?id=45907">45907</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>c++2a mode failures compiling LLVM Verifier.h - == overloads !=?
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>10.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++2a
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-bugs@bleg.org
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Raised as release blocker because this appears to be a regression.
It seems that operator== and operator!= are judged to be ambiguous overloads in
c++2a mode only (new in clang 10).
/usr/include/llvm/ADT/DenseMap.h:1222:8: note: candidate function
bool operator!=(const ConstIterator &RHS) const {
^
/usr/include/llvm/ADT/DenseMap.h:1215:8: note: candidate function
bool operator==(const ConstIterator &RHS) const {
$ uname -a
Linux flaky 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 x86_64
x86_64 x86_64 GNU/Linux
$ clang++-10 -v
clang version 10.0.0-4ubuntu1
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ cat verifier.cpp
#include <llvm/IR/Verifier.h>
int main() {
return 0;
}
$ clang++-10 -c verifier.cpp
<no errors>
$ clang++-9 -c -std=c++2a verifier.cpp
<no errors>
$ clang++-10 -c -std=c++2a verifier.cpp
In file included from verifier.cpp:1:
In file included from /usr/include/llvm/IR/Verifier.h:24:
/usr/include/llvm/IR/PassManager.h:694:17: error: use of overloaded operator
'!=' is ambiguous (with operand types 'llvm::DenseMapIterator<llvm::AnalysisKey
*, bool, llvm::DenseMapInfo<llvm::AnalysisKey *>,
llvm::detail::DenseMapPair<llvm::AnalysisKey *, bool>, false>' and
'llvm::DenseMapBase<llvm::SmallDenseMap<llvm::AnalysisKey *, bool, 8,
llvm::DenseMapInfo<llvm::AnalysisKey *>,
llvm::detail::DenseMapPair<llvm::AnalysisKey *, bool> >, llvm::AnalysisKey *,
bool, llvm::DenseMapInfo<llvm::AnalysisKey *>,
llvm::detail::DenseMapPair<llvm::AnalysisKey *, bool> >::iterator' (aka
'DenseMapIterator<llvm::AnalysisKey *, bool,
llvm::DenseMapInfo<llvm::AnalysisKey *>,
llvm::detail::DenseMapPair<llvm::AnalysisKey *, bool> >'))
if (IMapI != IsResultInvalidated.end())
~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/llvm/ADT/DenseMap.h:1222:8: note: candidate function
bool operator!=(const ConstIterator &RHS) const {
^
/usr/include/llvm/ADT/DenseMap.h:1215:8: note: candidate function
bool operator==(const ConstIterator &RHS) const {
^
/usr/include/llvm/ADT/DenseMap.h:1215:8: note: candidate function (with
reversed parameter order)
...</pre>
</div>
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