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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion failed with `decltype(auto)` and a function template with unknown return type"
href="http://llvm.org/bugs/show_bug.cgi?id=20517">20517</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Assertion failed with `decltype(auto)` and a function template with unknown return type
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++1y
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mimomorin@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>With this C++1y code:
template <typename T>
auto f(int);
int main(int argc, char* argv[])
{
decltype(auto) g = &f<int>;
return 0;
}
Clang crashes with the following message:
clang++ -std=c++1y ice_decltype_auto.cpp
ice_decltype_auto.cpp:6:24: error: reference to overloaded function could not
be
resolved; did you mean to call it?
decltype(auto) g = &f<int>;
^~~~~~~
ice_decltype_auto.cpp:2:6: note: possible target for call
auto f(int);
^
Assertion failed: (!isNull() && "Cannot retrieve a NULL type pointer"),
function getCommonPtr, file
Clang/llvm/tools/clang/lib/AST/../../include/clang/AST/Type.h, line 546.
0 clang 0x0000000104aea492 llvm::sys::PrintStackTrace(__sFILE*) + 34
Stack dump:
0. Program arguments: Clang/build/Release+Asserts/bin/clang -cc1 -triple
x86_64-apple-macosx10.7.0 -emit-obj -mrelax-all -disable-free -main-file-name
ice_decltype_auto.cpp -mrelocation-model pic -pic-level 2 -mdisable-fp-elim
-masm-verbose -munwind-tables -target-cpu core2 -target-linker-version 136
-dwarf-column-info -resource-dir
Clang/build/Release+Asserts/bin/../lib/clang/3.6.0 -std=c++1y
-fdeprecated-macro -fdebug-compilation-dir Codes -ferror-limit 19
-fmessage-length 80 -stack-protector 1 -mstackrealign -fblocks
-fobjc-runtime=macosx-10.7.0 -fencode-extended-block-signature -fcxx-exceptions
-fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o
/var/folders/r5/h6yf9zwn68z4slg54d38smq80000gn/T/ice_decltype_auto-fa456e.o -x
c++ ice_decltype_auto.cpp
1. ice_decltype_auto.cpp:6:31: current parser token ';'
2. ice_decltype_auto.cpp:5:1: parsing function body 'main'
3. ice_decltype_auto.cpp:5:1: in compound statement ('{}')
clang: error: unable to execute command: Illegal instruction: 4
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.6.0 (trunk 214512)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a> and include the crash backtrace, preprocessed source, and
associated run script.
clang: note: diagnostic msg:</pre>
</div>
</p>
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