[llvm-bugs] [Bug 34321] New: Custom OpenMP reduction in C++ template causes SEGFAULT at compile time

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https://bugs.llvm.org/show_bug.cgi?id=34321

            Bug ID: 34321
           Summary: Custom OpenMP reduction in C++ template causes
                    SEGFAULT at compile time
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: s6jaschu at uni-bonn.de
                CC: llvm-bugs at lists.llvm.org

Created attachment 19040
  --> https://bugs.llvm.org/attachment.cgi?id=19040&action=edit
Crash report

The following reduced test case does crash clang:

struct Summary {
  void merge(const Summary& other) {}
};

template <typename K>
void work() {
  Summary global_summary;
#pragma omp declare reduction(+ : Summary : omp_out.merge(omp_in))
#pragma omp parallel for reduction(+ : global_summary)
  for (int k = 1; k <= 100; ++k) {
  }
}

struct A {};

int main(int argc, char** argv) {
  work<A>();
  return 0;
}

I did compile it with "LDFLAGS="-L/usr/local/opt/llvm/lib
-Wl,-rpath,/usr/local/opt/llvm/lib" /usr/local/opt/llvm/bin/clang++ -std=c++11
-fopenmp=libomp main.cpp" using the homebrew version of llvm on macOS.

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