<html>
<head>
<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LTO linking error on x86_64-linux-gnu"
href="http://llvm.org/bugs/show_bug.cgi?id=21625">21625</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LTO linking error on x86_64-linux-gnu
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</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>
<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>su@cs.ucdavis.edu
</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>The following code causes a linker error when it is compiled on
x86_64-linux-gnu by the current clang trunk using LTO in 64-bit mode, but not
in 32-bit mode.
This also affects 3.2, 3.3, 3.4.x, and 3.5.0.
$ clang-trunk -v
clang version 3.6.0 (trunk 220839)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.8.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
$
$ clang-trunk -O0 fn1.c main.c
$ a.out
$
$ clang-trunk -flto -O0 fn1.c main.c
ld: /tmp/llvm/lib/Analysis/MemoryDependenceAnalysis.cpp:1365: bool
llvm::MemoryDependenceAnalysis::getNonLocalPointerDepFromBB(const
llvm::PHITransAddr &, const AliasAnalysis::Location &, bool, llvm::BasicBlock
*, SmallVectorImpl<llvm::NonLocalDepResult> &, DenseMap<llvm::BasicBlock *,
llvm::Value *> &, bool): Assertion `I->getResult().isNonLocal() && "Should only
be here with transparent block"' failed.
clang: error: unable to execute command: Aborted (core dumped)
clang: error: linker command failed due to signal (use -v to see invocation)
$
$ cat fn1.c
struct
{
int f0;
} c;
int a, b, d;
int
fn1 ()
{
int e, h = 0, *f = &a, **g = &f;
for (c.f0 = 0; c.f0;)
{
int ***i = &g;
for (; d < 1; d++)
for (; c.f0; c.f0--)
for (; h;)
f = **i;
b++;
int *j = 0, **k = &j;
for (e = 0; e;)
{
int ***l = &k;
for (;;)
**l = 0;
}
return **k;
}
return **g;
}
$ cat main.c
extern int fn1 ();
int
main ()
{
fn1 ();
return 0;
}
$</pre>
</div>
</p>
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