[LLVMdev] [PATCH] Undo revision 192117

[Reid Kleckner]

Let Matt Arsenault take a look at this.  GCC is probably trying to generate
code to call __memcpy_chk with LLVM's objectsize intrinsic.


On Mon, Feb 10, 2014 at 1:23 PM, Scott Pakin <pakin at lanl.gov> wrote:

> It took a while to track down, but it looks like revision 192117
> (dated 2013-10-07) is the source of a DragonEgg segfault I've been
> fighting with for quite some time.  For details and a reproducer (less
> than a page of C++ code) please see my Bugzilla report:
>
>     Bug 18358 - "internal compiler error: Segmentation fault" on C++ code
>     http://llvm.org/bugs/show_bug.cgi?id=18358
>
> The real code that this affects is my Byfl tool,
> https://github.com/losalamos/Byfl, which compiles with LLVM revision
> 192116 and earlier but not with revision 192117 and later.
>
> I must admit I don't understand exactly what r192117 is doing, but
> I've attached a patch that simply and stupidly reverses the changes
> performed by r192117.  Applying this patch to trunk (r201101) gets
> Byfl and my reproducer compiling again.
>
> Any chance this patch -- or, even better, a "real" fix for whatever
> problem r192117 is introducing -- can make it into LLVM?  (I've never
> submitted a patch before and don't know what the formal procedure is.)
>
> Thanks,
> -- Scott
>
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