[llvm-bugs] [Bug 25919] New: r256105-added assertion fails when LTOing C++ code.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25919

            Bug ID: 25919
           Summary: r256105-added assertion fails when LTOing C++ code.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Core LLVM classes
          Assignee: unassignedbugs at nondot.org
          Reporter: ahmed.bougacha at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Consider:

  struct A {
    virtual void a() {}
  };

  void b() {
    A().a();
  }

With r256105, this:

  clang++ -flto a.cpp -O0

fails with:

  Assertion failed: (M->isMaterialized()), function assertModuleIsMaterialized,
file ../lib/IR/Value.cpp, line 324.

This is on darwin; coming from analyzeGlobal:

  * frame #5: 0x00000001024d2b9d
libLTO.dylib`llvm::Value::assertModuleIsMaterialized(this=0x00000001006154f8)
const + 125 at Value.cpp:324
    frame #6: 0x000000010308f855
libLTO.dylib`llvm::Value::uses(this=0x00000001006154f8) const + 21 at
Value.h:321
    frame #7: 0x000000010366b0be
libLTO.dylib`analyzeGlobalAux(V=0x00000001006154f8, GS=0x0000700001803f28,
PhiUsers=0x0000700001803e60) + 94 at GlobalStatus.cpp:56
    frame #8: 0x000000010366b039
libLTO.dylib`llvm::GlobalStatus::analyzeGlobal(V=0x00000001006154f8,
GS=0x0000700001803f28) + 57 at GlobalStatus.cpp:181
    frame #9: 0x0000000102bf6421
libLTO.dylib`llvm::canBeOmittedFromSymbolTable(GV=0x00000001006154f8) + 177 at
Analysis.cpp:643
    frame #10: 0x00000001025269de
libLTO.dylib`llvm::LTOModule::addDefinedSymbol() + 574 at LTOModule.cpp:480
    frame #11: 0x0000000102526e4a
libLTO.dylib`llvm::LTOModule::addDefinedFunctionSymbol() + 42 at
LTOModule.cpp:444
    frame #12: 0x0000000102526e0a
libLTO.dylib`llvm::LTOModule::addDefinedFunctionSymbol(this=0x00000001006206b0,
Sym=0x0000700001804368) + 234 at LTOModule.cpp:439
    frame #13: 0x0000000102523ded
libLTO.dylib`llvm::LTOModule::parseSymbols(this=0x00000001006206b0) + 749 at
LTOModule.cpp:633
    frame #14: 0x0000000102521e28
libLTO.dylib`llvm::LTOModule::makeLTOModule(Buffer=MemoryBufferRef @
0x0000700001805ca0, options=TargetOptions @ 0x0000700001805ce8,
Context=0x0000000100600880) + 9864 at LTOModule.cpp:262
    frame #15: 0x0000000102522c35
libLTO.dylib`llvm::LTOModule::createInContext() + 437 at LTOModule.cpp:160
    frame #16: 0x0000000102522d08
libLTO.dylib`llvm::LTOModule::createInLocalContext() + 168 at LTOModule.cpp:151
    frame #17: 0x000000010180349b
libLTO.dylib`::lto_module_create_in_local_context() + 155 at lto.cpp:253

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