[LLVMbugs] [Bug 19491] New: Program crash due to mixed constant/dynamic static initialization

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19491

            Bug ID: 19491
           Summary: Program crash due to mixed constant/dynamic static
                    initialization
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: kevin at kevinlocke.name
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

As discussed in the thread on cfe-dev starting at
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-April/036279.html with better
isolation of the issue in
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-April/036287.html if a common
variable is initialized as a constant in one translation unit and dynamically
in another, linking those units together will result in the program crashing
during initialization (with EXC_BAD_ACCESS on OS X).

The only instances of this behavior that I am aware of are due to user error,
either incorrectly defining common variables or using incompatible compiler
settings for different translation units.  However, since it will occur when
two translation units use the boost library and are compiled with and without
-std=c++11 respectively, I would expect that the error is not uncommon and is
an instance where spending the effort to avoid the error or better handle it
would be worth the effort.

Richard Smith laid out a potential solution in
http://lists.cs.uiuc.edu/pipermail/cfe-dev/2014-April/036336.html I'm not sure
to what extent it may have already been considered or be on the roadmap, but I
wanted to file this bug so that other interested users and developers could
follow the progress on the issue (and more easily find a description of the
issue if they encounter it).

Thanks,
Kevin

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