[cfe-users] Compiling llvm 3.4 using g++-4.7 on ARM: lib/LTO/LTOCodeGenerator.cpp:166:1: internal compiler error: in merge_if_block, at ifcvt.c

[Kim Gräsman]

David,

Would you do the honors? I don't have commit access.

It would be best, of course, if there was a way to phrase this so GCC
doesn't die, but this pattern is everywhere so it might be futile to solve
it only here.

- Kim


On Thu, Jul 31, 2014 at 9:03 PM, David Blaikie <dblaikie at gmail.com> wrote:

> Probably worth adding a comment to exlpain why it needs to be there.
>
> Also, there's a reason that coding standard is in place - because we
> get better error (warning ) messages that way. Is there a way to
> workaround the bug without sacrificing future warning quality?
>
> On Thu, Jul 31, 2014 at 11:47 AM, Kim Gräsman <kim.grasman at gmail.com>
> wrote:
> > Hi Cy,
> >
> > Unfortunately this goes against the general coding standards for LLVM:
> >
> http://llvm.org/docs/CodingStandards.html#don-t-use-default-labels-in-fully-covered-switches-over-enumerations
> >
> > but as a local workaround it seems fine.
> >
> > I wonder if GCC 4.7 for ARM should be listed here:
> > http://llvm.org/docs/GettingStarted.html#check-here
> >
> > - Kim
> >
> >
> > On Wed, Jul 30, 2014 at 10:57 AM, Cy Anetwork <cya3636 at yahoo.com> wrote:
> >>
> >> Hello,
> >>
> >> I've managed to track down some code which causes GCC to fail with an
> >> internal compiler error when compiling llvm/clang for ARM.  I've
> included
> >> the diff for this one file inline.. hope that's ok.
> >>
> >> ==================================8<====================================
> >> --- ../llvm/lib/LTO/LTOCodeGenerator.cpp.old    2014-07-30 08:33:30
> +0000
> >> +++ ../llvm/lib/LTO/LTOCodeGenerator.cpp        2014-07-30 08:39:03
> +0000
> >> @@ -150,6 +150,9 @@
> >>    case LTO_DEBUG_MODEL_DWARF:
> >>      EmitDwarfDebugInfo = true;
> >>      return;
> >> +
> >> +  default:
> >> +    return;
> >>    }
> >>    llvm_unreachable("Unknown debug format!");
> >>  }
> >> @@ -161,6 +164,8 @@
> >>    case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
> >>      CodeModel = model;
> >>      return;
> >> +  default:
> >> +    return;
> >>    }
> >>    llvm_unreachable("Unknown PIC model!");
> >>  }
> >> @@ -293,6 +298,8 @@
> >>    case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
> >>      RelocModel = Reloc::DynamicNoPIC;
> >>      break;
> >> +  default:
> >> +    break;
> >>    }
> >>
> >>    // construct LTOModule, hand over ownership of module and target
> >> ==================================8<====================================
> >>
> >> Many thanks,
> >>
> >> cya.net
> >>
> >>
> >> _______________________________________________
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> >> cfe-users at cs.uiuc.edu
> >> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-users
> >
> >
> >
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> >
>
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