[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]

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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