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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Segmentation fault using -mcmodel=large -fpic options after r337740"
href="https://bugs.llvm.org/show_bug.cgi?id=38385">38385</a>
</td>
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<th>Summary</th>
<td>Segmentation fault using -mcmodel=large -fpic options after r337740
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>
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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>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ilia.taraban@intel.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This test fails with Segmentation fault after r337740:
================= nice.c ==============
int main ()
{
unsigned int a [100] = {0};
return 0;
}
=======================================
<span class="quote">>>> clang -v</span >
clang version 7.0.0 (trunk 338366)
Target: x86_64-unknown-linux-gnu
Thread model: posix
...
<span class="quote">>>> clang -O0 -o nice.exe nice.c
>>> nice.exe</span >
<span class="quote">>>> clang -O0 -mcmodel=large -fpic -o nice.exe nice.c
>>> nice.exe </span >
Segmentation fault (core dumped)
Started failing after
------------------------------------------------------------------------
r337740 | rnk | 2018-07-23 23:14:35 +0200 (Mon, 23 Jul 2018) | 9 lines
Re-land r335297 "[X86] Implement more of x86-64 large and medium PIC code
models"
Don't try to generate large PIC code for non-ELF targets. Neither COFF
nor MachO have relocations for large position independent code, and
users have been using "large PIC" code models to JIT 64-bit code for a
while now. With this change, if they are generating ELF code, their
JITed code will truly be PIC, but if they target MachO or COFF, it will
contain 64-bit immediates that directly reference external symbols. For
a JIT, that's perfectly fine.
------------------------------------------------------------------------</pre>
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