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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - [OPENMP] canonical loop rejected when comparison has implicit conversions or destruction" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24121&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=F9jxFxIRJXYlurRrwsbWwrhA1p-VO9y523dxYppeRX4&s=K0ApFvbtG5b2MHmh6Yqxq72XiOjxtHJke8uio6ZFs6I&e=">24121</a>
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<th>Summary</th>
<td>[OPENMP] canonical loop rejected when comparison has implicit conversions or destruction
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14587" name="attach_14587" title="Test canonical loop with custom random access iterators">attachment 14587</a> <a href="attachment.cgi?id=14587&action=edit" title="Test canonical loop with custom random access iterators">[details]</a></span>
Test canonical loop with custom random access iterators
When a user-defined random access iterator is used with the OpenMP loop
construct, Clang rejects canonical loops if the comparison operation entails
implicit conversions or the creation of temporaries requiring non-trivial
destruction.
Source is attached; various cases are included under macro control.
CASE_0: this works; it includes an namespace operator< for the iterator type
CASE_1: this fails; calling the same operator< now involves non-trivial temp
destruction
CASE_2: this fails; the operator< returns a class object which is contextually
convertible to bool
CASE_3: this fails; a built-in operator< is used, requiring implicit conversion
of the operands
### COMPILER INVOCATION:
clang++ -fopenmp=libomp -std=c++11 openmpCmpOp.cc -DCASE_0 -c
clang++ -fopenmp=libomp -std=c++11 openmpCmpOp.cc -DCASE_1 -c
clang++ -fopenmp=libomp -std=c++11 openmpCmpOp.cc -DCASE_2 -c
clang++ -fopenmp=libomp -std=c++11 openmpCmpOp.cc -DCASE_3 -c
### OUTPUT (failing cases):
openmpCmpOp.cc:62:29: error: condition of OpenMP for loop must be a relational
comparison ('<', '<=', '>', or '>=') of loop variable 'it'
for (It<char> it = begin; it < end; ++it) {
^~~~~~~~
1 error generated.
### EXPECTED OUTPUT:
(Compiles successfully).
### COMPILER VERSION INFO:
clang version 3.7.0 (trunk)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.3
Selected GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.3
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
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