[llvm-bugs] [Bug 24543] New: [64-bit ms] clang-cl produced binary crashes with StackWalk64

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24543

            Bug ID: 24543
           Summary: [64-bit ms] clang-cl produced binary crashes with
                    StackWalk64
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The attached program sets up a crash handler that calls StackWalk64 to print
stacks on crash, and the calls __debugbreak(). This crashes once (for the
__debugbreak) when the program is built with cl but twice if it's built with
clang-cl. Only happens in 64-bit and only with optimizations enabled.

I think this is the cause of
https://code.google.com/p/chromium/issues/detail?id=520982

C:\src\chrome\src>"third_party\llvm-build\Release+Asserts\bin\clang-cl.exe"
test.cc dbghelp.lib /Zi /O2 /Zc:inline /Oy- /D_HAS_EXCEPTIONS=0 -m64

C:\src\chrome\src>cl test.cc  dbghelp.lib /Zi /O2 /Zc:inline /Oy- 
/D_HAS_EXCEPTIONS=0

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