<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=19079">19079</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.
$ clang-trunk -v
clang version 3.5.0 (trunk 203239)
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 fn2.c main.c
$ a.out
$
$ clang-trunk -flto -O0 -c fn2.c
$ clang-trunk -flto -O1 -c fn1.c
$ clang-trunk -flto -O1 -c main.c
$ clang-trunk -flto -O1 fn1.o fn2.o main.o
ld: /tmp/llvm/include/llvm/Support/Casting.h:240: typename cast_retty<X, Y
*>::ret_type llvm::cast(Y *) [X = llvm::PHINode, Y = llvm::Instruction]:
Assertion `isa<X>(Val) && "cast<Ty>() argument of incompatible type!"' 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
extern int a, b, c, i, f;
void
fn1 ()
{
int j = 0, k = 1;
for (; k; k = 0)
{
if (i)
continue;
for (; j < 1; j++)
;
}
lbl:
for (; b < 1; b++)
{
if (c)
continue;
for (;;)
if (a & 1)
{
if (j)
goto lbl;
f--;
}
}
}
$ cat fn2.c
extern int a, c, d, e[1], f;
extern void fn1 ();
void
fn2 (void)
{
int g[1] = {0};
int h = 1;
for (;;)
{
for (; h < 1; h++)
if (g[0])
fn1 ();
for (; a < 1; a++)
for (; d < 1; d++)
;
if (e[0])
break;
c = 0;
}
}
$ cat main.c
extern void fn2 ();
int a, b, c = 1, d, e[1] = {1}, f, i;
int
main ()
{
fn2 ();
return 0;
}</pre>
</div>
</p>
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