[llvm-bugs] [Bug 31608] New: Clang-CL ICE with template instantiation

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31608

            Bug ID: 31608
           Summary: Clang-CL ICE with template instantiation
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: steveire at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

I don't know what is really the trigger for this, but here is the reduced
reproducer using the snapshot from http://llvm.org/builds/:

 c:\dev\tmp>type source_file.cpp

 class SomeType;

 struct __declspec(dllexport) Base
 {
 public:
     virtual ~Base();
 };

 template<typename T>
 struct __declspec(dllexport) MyTemplate : public Base
 {
 };

 struct __declspec(dllexport) SubClass : public MyTemplate<SomeType>
 {
 };

 template struct MyTemplate<SomeType>;

 c:\dev\tmp>"C:\Program Files\LLVM\msbuild-bin\CL.exe" /c source_file.cpp
 Assertion failed: CurFn->isDeclaration() && "Function already has body?", file
D:\src\llvm_package_291454\llvm\tools\clang\lib\CodeGen\CodeGenFunction.cpp,
line 732
 Wrote crash dump file "cl.exe-8a689f.dmp"

 clang-cl.exe: error: clang frontend command failed due to signal (use -v to
see invocation)
 clang version 4.0.0 (trunk)
 Target: x86_64-pc-windows-msvc
 Thread model: posix

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