<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang++ rejects legal code"
href="https://bugs.llvm.org/show_bug.cgi?id=37851">37851</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang++ rejects legal code
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The code is as follow:
#include <iostream>
auto add_1(auto a, auto b) { return a + b;}
auto add_2 = [](auto a, auto b) { return a + b;};
int main()
{
std::cout
<< "a1: " << add_1(3.5, 4) << "\n"
<< "a2: " << add_1(3, 4.5) << "\n"
<< "a3: " << add_2(3.5, 4) << "\n"
<< "a4: " << add_2(3, 4.5) << "\n";
}
clang++ produces the error messages:
code0.c.cpp:3:12: error: 'auto' not allowed in function prototype
auto add_1(auto a, auto b) { return a + b;}
code0.c.cpp:3:20: error: 'auto' not allowed in function prototype
auto add_1(auto a, auto b) { return a + b;}
^~~~
2 errors generated.
g++ accepts the code. In fact, the code comes from a gcc bug report:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66197">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66197</a>
The report says that a previous version of gcc compiles the above code into
incorrect binary code, so the above program produces wrong values. It is
interesting to explore whether clang++ has similar problems, right?</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>