[LLVMbugs] [Bug 11041] New: llvm-link crashes when linking to bytecode files

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11041

           Summary: llvm-link crashes when linking to bytecode files
           Product: tools
           Version: 2.9
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-link
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: dominic.letz at berlin.de
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=7375)
 --> (http://llvm.org/bugs/attachment.cgi?id=7375)
.bc files for reproduction

When compiling scummvm1.3.1 using llvm and emiting bytecode only llvm crashes
on linking 

engines/gob/sound/adlib.o and engines/gob/sound/pcspeaker.o (actually being .bc
files but having .o ending because of the used Makefile)

Command line:
llvm-link -S -o engines/gob/libgob.a engines/gob/sound/pcspeaker.o
engines/gob/sound/adlib.o

Issue seems to be that in LinkModules.cpp:682 "DAliasee" is actuall 0:
<code>
    // Fixup aliases to bitcasts.  Note that aliases to GEPs are still broken
    // by this, but aliases to GEPs are broken to a lot of other things, so
    // it's less important.
    Constant *DAliaseeConst = DAliasee;
    if (SGA->getType() != DAliasee->getType()) <== CRASH
      DAliaseeConst = ConstantExpr::getBitCast(DAliasee, SGA->getType());
</code>

Stacktrace:

#0  0x0000000000428a1e in llvm::PATypeHolder::get (this=0x10) at
/home/dominic/emscripten/llvm/include/llvm/Type.h:507
#1  0x0000000000427692 in llvm::PATypeHolder::operator llvm::Type* (this=0x10)
    at /home/dominic/emscripten/llvm/include/llvm/AbstractTypeUser.h:159
#2  0x00000000004279c2 in llvm::Value::getType (this=0x0) at
/home/dominic/emscripten/llvm/include/llvm/Value.h:110
#3  0x0000000000427bca in llvm::GlobalValue::getType (this=0x0) at
/home/dominic/emscripten/llvm/include/llvm/GlobalValue.h:110
#4  0x000000000046361c in LinkAlias (Dest=0x8b13e0, Src=0x8b1750, ValueMap=...,
Err=0x7fffffffe070) at LinkModules.cpp:682
#5  0x00000000004663f6 in llvm::Linker::LinkModules (Dest=0x8b13e0,
Src=0x8b1750, ErrorMsg=0x7fffffffe070) at LinkModules.cpp:1270
#6  0x0000000000406d54 in main (argc=6, argv=0x7fffffffe188) at
llvm-link.cpp:106

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