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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - long double representation causes Segmentation fault"
href="https://llvm.org/bugs/show_bug.cgi?id=24398">24398</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>long double representation causes Segmentation fault
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.6
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++14
</td>
</tr>
<tr>
<th>Assignee</th>
<td>martellmalone@gmail.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>taenaru@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hello,
I have met an issue with segmentation fault in program which was built by
clang.
Here is the code which represents the bug:
#include <iostream>
#include <string>
int main() {
char *ptr;
const char *s = "1.23";
long double ld = std::strtold(s, &ptr);
std::cout << ld;
return 0;
}
With the current g++ (5.2.0) there is no problem, but clang has.
I use clang from mingw64 repo:
clang version 3.6.2 (tags/RELEASE_362/final)
Target: x86_64-w64-windows-gnu
Thread model: posix
I also tried to build the latest available clang , but it has the same effect:
clang version 3.8.0 (trunk)
Target: x86_64-w64-windows-gnu
Thread model: posix
And I also found one more case when clang++ gives Segmentation fault error:
#include <sstream>
#include <iostream>
long double foo(long double v) {
std::stringstream ss;
ss << v;
ss.precision(6);
ss >> v;
return v;
}
int main() {
long double a = 10.1238127638712638;
std::cout << foo(a) << std::endl;
return 0;
}</pre>
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