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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 --- - PPC32: Base pointer clobbered with -fPIC"
href="http://llvm.org/bugs/show_bug.cgi?id=22115">22115</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>PPC32: Base pointer clobbered with -fPIC
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.5
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>marcus@mc.pp.se
</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>Created <span class=""><a href="attachment.cgi?id=13646" name="attach_13646" title="Output from clang -fPIC -S for foo.c">attachment 13646</a> <a href="attachment.cgi?id=13646&action=edit" title="Output from clang -fPIC -S for foo.c">[details]</a></span>
Output from clang -fPIC -S for foo.c
clang uses R30 as a pointer to a compilation-unit specific constant pool, but
does not save it in either the caller or callee in cross-compilation-unit
calls.
If the following example:
--8<-- foo.c --8<--
#include <stdio.h>
int foo()
{
fprintf(stderr, "Two\n");
return 0;
}
void dummy()
{
fprintf(stderr, "Gotcha\n");
}
--8<-- bar.c --8<--
#include <stdio.h>
extern int foo(void);
int bar()
{
fprintf(stderr, "One\n");
int r = foo();
fprintf(stderr, "Three\n");
return r;
}
--8<--
is compiled with -fPIC, the output printed by bar() becomes
One
Two
Gothca
instead of the correct
One
Two
Three
Attaching assembler code generated by clang.</pre>
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