[llvm-bugs] [Bug 30344] New: Assertion `Val && "isa<> used on a null pointer"' failed while linking LTO objects (recent regression)

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30344

            Bug ID: 30344
           Summary: Assertion `Val && "isa<> used on a null pointer"'
                    failed while linking LTO objects (recent regression)
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: bero at lindev.ch
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17236
  --> https://llvm.org/bugs/attachment.cgi?id=17236&action=edit
IR code producing the assert

Using llvm and clang svn rev. 281115 (3.9.0 release is ok), building
networkmanager-qt with lto enabled (both -flto and -flto=thin produce the
error) results in

ld: ../include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<llvm::GlobalAlias, const llvm::GlobalValue *>::doit(const
>From *) [To = llvm::GlobalAlias, From = const llvm::GlobalValue *]: Assertion
`Val && "isa<> used on a null pointer"' failed.
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: linker command failed due to signal (use -v to see
invocation)

The error is reproducible when using just one of the object files generated
earlier (attached).

$ clang -fPIC -flto -shared -o test.so device.cpp.o 
ld: ../include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<llvm::GlobalAlias, const llvm::GlobalValue *>::doit(const
>From *) [To = llvm::GlobalAlias, From = const llvm::GlobalValue *]: Assertion
`Val && "isa<> used on a null pointer"' failed.
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: linker command failed due to signal (use -v to see
invocation)

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