http://llvm.org/bugs/show_bug.cgi?id=19111
Bug ID: 19111
Summary: wrong code by LTO on x86_64-linux-gnu (both 32-bit and
64-bit modes)
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: s...@cs.ucdavis.edu
CC: llvmbugs@cs.uiuc.edu
Classification: Unclassified
The current clang trunk miscompiles the following code when using LTO on
x86_64-linux-gnu in both 32-bit and 64-bit modes.
$ clang-trunk -v
clang version 3.5.0 (trunk 203564)
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 foo.c main.c
$ a.out
$
$ clang-trunk -flto -O0 -c foo.c
$ clang-trunk -flto -O1 -c main.c
$ clang-trunk -flto -O1 foo.o main.o
$ a.out
a.out: main.c:12: int main(): Assertion `b == 0' failed.
Aborted (core dumped)
$
$ cat foo.c
extern int c, **d;
static int
bar (int p)
{
return 0;
}
int *
foo (void)
{
int ***e = &d;
for (; c < 1; c++)
bar (*e == 0);
return 0;
}
$ cat main.c
#include <assert.h>
extern int *foo (void);
int a, *b = &a, c, **d = &b;
int
main ()
{
*b = 0;
*d = 0;
assert (b == 0);
foo ();
return 0;
}
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