[LLVMbugs] [Bug 21625] New: LTO linking error on x86_64-linux-gnu

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21625

            Bug ID: 21625
           Summary: LTO linking error on x86_64-linux-gnu
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

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;
}
$

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