[llvm-bugs] [Bug 36645] New: isCXX11ConstantExpr related segfault

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36645

            Bug ID: 36645
           Summary: isCXX11ConstantExpr related segfault
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: taruti at taruti.net
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 20019
  --> https://bugs.llvm.org/attachment.cgi?id=20019&action=edit
clang 6.0 crash

OpenCPN recently enabled C++11 and when trying out clang instead of gcc I
stumbled upon a crash in clang. This seems to occur on both 6.0.0-1 and a trunk
version in Debian sid. 

The crash goes away with -std=c++98.

This is enough to reproduce this (produced by multidelta)
```
struct DATUM {
         const char *name;
         short ellipsoid;
};
struct DATUM const gDatum[] = {
        { "Adindan", 5}
};
void datumParams(short datum, double *a, double *es) {
  extern struct DATUM const gDatum[];
}
static int isWGS84(int i) {
  if (gDatum[i].ellipsoid != gDatum[0].ellipsoid)         return i;

```

Which crashes with:
clang++-7 -c georef.ii -O0 -emit-llvm -o /dev/null
clang++-6.0 -c georef.ii -O0 -emit-llvm -o /dev/null
and does not crash with -std=c++98.

Attached are logs of crashes from both clang versions and a preprocessed
original source file. Original source is at https://github.com/OpenCPN/OpenCPN

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