[cfe-dev] Clang produces corrupt pch leading to crash

[Nikola Smiljanic]

Thanks for the detailed report! The only thing you can do more is try and
debug this yourself ;)


On Mon, Jun 16, 2014 at 8:33 PM, Tobias Hahn <tobias.hahn at ableton.com>
wrote:

> Hi all,
>
> I've run into (what I believe is) a memory bug with clang while producing
> a precompiled header. In short, under certain circumstances, clang will
> write a pch that causes a crash when trying to use this pch in a later
> compilation unit.
>
> Occasionally, while clang is compiling the pch, malloc complains that one
> of its checksums has been overwritten; while at other times, clang throws
> an error that a definition has a different exception specification than the
> declaration two lines above it (when both have no exception specification).
> Both these symptoms lead me to believe that somewhere clang overwrites
> memory.
>
> I have stripped the code that reliably causes this crash down to a few
> hundred lines and have created a little script to reproduce the bug
> (details at http://llvm.org/bugs/show_bug.cgi?id=20026). I'm not sure,
> however, about your process for handling such bugs, which is why I'm
> cross-posting here. My main question is if there is anything else I could
> provide you with to help fixing this issue.
>
> Thank you very much in advance!
>
> Best,
> Tobias
>
>
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