[llvm-bugs] [Bug 37906] New: valid sizeof operation introduced compiler crash

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37906

            Bug ID: 37906
           Summary: valid sizeof operation introduced compiler crash
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pickensd at synopsys.com
                CC: llvm-bugs at lists.llvm.org

The following C test case causes clang to crash.

Assertion failed: (ND->isUsed(false) || !isa<VarDecl>(ND) ||
!E->getLocation().isValid()) && "Should not use decl without marking it used!",
file C:\src\llvm_package_333363\llvm\tools\clang\lib\CodeGen\CGExpr.cpp, line
2453

% clang --version
clang version 7.0.0 (trunk)
Target: i686-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files (x86)\LLVM\bin

Test case: 
---------------- test.c --------------------------------------
#include <stdarg.h>

extern void exit (int);
extern void abort (void);

char a[1];

void
f1 (void)
{
  int i = 0;
  int j = sizeof (typeof (*(++i, (char (*)[i])a)));
  if (i != 1 || j != 1)
    abort ();
}

int
main (void)
{
  f1 ();
  exit (0);
}

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