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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - std::is_pod weirdly affected by volatile"
href="https://bugs.llvm.org/show_bug.cgi?id=35076">35076</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>std::is_pod weirdly affected by volatile
</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>All
</td>
</tr>
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<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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jpakkane@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If you compile the following code with Clang:
#include <iostream>
#include <type_traits>
#include <cstdint>
typedef struct
{
int64_t dt_us;
} __attribute__ ((packed)) mytime_t ;
struct MyTimeDate
{
volatile mytime_t mytime;
};
int main(int argc, const char *argv[])
{
std::cout << "is_pod " << std::is_pod<MyTimeDate>::value << std::endl;
return 0;
}
It will print "is_pod 0". If you move the volatile to the upper definition like
this:
typedef struct
{
volatile int64_t dt_us;
} __attribute__ ((packed)) mytime_t ;
struct MyTimeDate
{
mytime_t mytime;
};
Then it will print "is_pod 1". The same code on GCC prints "is_pod 1" for both
programs.
Tested on Ubuntu 17/04.</pre>
</div>
</p>
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